add: graphs et rushs

661 files changed, 24921 insertions, 0 deletions

diff --git a/graphs/cpp/.clang-format b/graphs/cpp/.clang-format
new file mode 100644
index 0000000..6c10a16
--- /dev/null
+++ b/graphs/cpp/.clang-format
@@ -0,0 +1,80 @@
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Right
+AlignOperands: false
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+    AfterEnum: true
+    AfterClass: true
+    AfterControlStatement: true
+    AfterFunction: true
+    AfterNamespace: true
+    AfterStruct: true
+    AfterUnion: true
+    AfterExternBlock: true
+    BeforeCatch: true
+    BeforeElse: true
+    IndentBraces: false
+    SplitEmptyFunction: false
+    SplitEmptyRecord: false
+    SplitEmptyNamespace: false
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeComma
+BreakStringLiterals: true
+ColumnLimit: 80
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+FixNamespaceComments: true
+ForEachMacros: ['ILIST_FOREACH', 'ILIST_FOREACH_ENTRY']
+IncludeBlocks: Regroup
+IncludeCategories:
+    - Regex: '<.*>'
+      Priority: 1
+    - Regex: '.*'
+      Priority: 2
+IndentCaseLabels: false
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+NamespaceIndentation: All
+PointerAlignment: Left
+ReferenceAlignment: Left
+ReflowComments: true
+SortIncludes: true
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never
diff --git a/graphs/cpp/.gitignore b/graphs/cpp/.gitignore
new file mode 100644
index 0000000..4cf8e3f
--- /dev/null
+++ b/graphs/cpp/.gitignore
@@ -0,0 +1,6 @@
+*/.gitignore
+.idea/
+*.out
+*.tar
+cmake*
+build/
diff --git a/graphs/cpp/CMakeLists.txt b/graphs/cpp/CMakeLists.txt
new file mode 100644
index 0000000..a40c5d7
--- /dev/null
+++ b/graphs/cpp/CMakeLists.txt
@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.21.2)
+project(cproutprout)
+
+add_executable(cpipi hello_world/hello_world.cc
+        directories_infos/directory_info.cc
+        directories_infos/read_info.cc
+        war/soldier.hh
+        war/soldier.cc
+        war/knight.hh
+        war/knight.cc
+        war/regiment.hh
+        war/regiment.cc)
\ No newline at end of file
diff --git a/graphs/cpp/address_book/address_book.cc b/graphs/cpp/address_book/address_book.cc
new file mode 100644
index 0000000..92e74cf
--- /dev/null
+++ b/graphs/cpp/address_book/address_book.cc
@@ -0,0 +1,75 @@
+//
+// Created by martial.simon on 2/26/25.
+//
+
+#include "address_book.hh"
+
+#include <iostream>
+#include <stdexcept>
+bool AddressBook::add(const std::string& full_name, const std::string& email,
+                      const std::string& number)
+{
+    try
+    {
+        ContactDetails details = ContactDetails::makeDetails(number, email);
+        if (full_name.empty())
+            return false;
+        contact_map_.insert({ full_name, details });
+        return true;
+    }
+    catch (std::invalid_argument& e)
+    {
+        return false;
+    }
+}
+std::vector<ContactDetails> AddressBook::find(const std::string& full_name)
+{
+    std::vector<ContactDetails> res;
+    for (auto detail = contact_map_.find(full_name);
+         detail != contact_map_.end() && detail->first == full_name; detail++)
+    {
+        res.push_back(detail->second);
+    }
+    return res;
+}
+std::size_t AddressBook::count(const std::string& full_name)
+{
+    size_t res = 0;
+    for (auto detail = contact_map_.find(full_name);
+         detail != contact_map_.end(); detail++)
+    {
+        res++;
+    }
+    return res;
+}
+bool AddressBook::remove(const std::string& full_name, std::size_t index)
+{
+    auto range = contact_map_.equal_range(full_name);
+    for (auto contact = range.first; contact != range.second; contact++)
+    {
+        if (contact->first == full_name)
+        {
+            if (index == 0)
+            {
+                contact_map_.erase(contact);
+                return true;
+            }
+            index--;
+        }
+    }
+    return false;
+}
+void AddressBook::remove_all(const std::string& full_name)
+{
+    auto range = contact_map_.equal_range(full_name);
+    contact_map_.erase(range.first, range.second);
+}
+std::ostream& operator<<(std::ostream& os, const AddressBook& b)
+{
+    os << b.contact_map_.size() << " contact(s) in the address book.\n";
+    for (auto& pair : b.contact_map_)
+    {
+        os << "- " << pair.first << ": " << pair.second;
+    }
+    return os;
+}
\ No newline at end of file
diff --git a/graphs/cpp/address_book/address_book.hh b/graphs/cpp/address_book/address_book.hh
new file mode 100644
index 0000000..9e59ac9
--- /dev/null
+++ b/graphs/cpp/address_book/address_book.hh
@@ -0,0 +1,25 @@
+//
+// Created by martial.simon on 2/26/25.
+//
+
+#pragma once
+#include <map>
+#include <string>
+#include <vector>
+
+#include "contact_details.hh"
+
+class AddressBook
+{
+public:
+    bool add(const std::string& full_name, const std::string& email,
+             const std::string& number);
+    std::vector<ContactDetails> find(const std::string& full_name);
+    std::size_t count(const std::string& full_name);
+    bool remove(const std::string& full_name, std::size_t index);
+    void remove_all(const std::string& full_name);
+    friend std::ostream& operator<<(std::ostream& os, const AddressBook& b);
+
+private:
+    std::multimap<std::string, ContactDetails> contact_map_;
+};
diff --git a/graphs/cpp/address_book/contact_details.cc b/graphs/cpp/address_book/contact_details.cc
new file mode 100644
index 0000000..3880d14
--- /dev/null
+++ b/graphs/cpp/address_book/contact_details.cc
@@ -0,0 +1,38 @@
+//
+// Created by martial.simon on 2/26/25.
+//
+
+#include "contact_details.hh"
+
+#include <iostream>
+#include <stdexcept>
+ContactDetails ContactDetails::makeDetails(const std::string& telephone_number,
+                                           const std::string& personal_email)
+{
+    for (auto digit : telephone_number)
+    {
+        if (!isdigit(digit))
+            throw std::invalid_argument{
+                "Phone number must only contain digits."
+            };
+    }
+    size_t i;
+    for (i = 0; i < personal_email.length(); ++i)
+    {
+        if (personal_email[i] == '@')
+            break;
+    }
+    if (i == personal_email.length())
+        throw std::invalid_argument{ "Email must contain at least one '@'." };
+    return ContactDetails{ telephone_number, personal_email };
+}
+std::ostream& operator<<(std::ostream& os, const ContactDetails& dt)
+{
+    os << dt.phone_ << ", " << dt.email_ << "\n";
+    return os;
+}
+ContactDetails::ContactDetails(const std::string& telephone_number,
+                               const std::string& personal_email)
+    : phone_{ telephone_number }
+    , email_{ personal_email }
+{}
\ No newline at end of file
diff --git a/graphs/cpp/address_book/contact_details.hh b/graphs/cpp/address_book/contact_details.hh
new file mode 100644
index 0000000..57a6438
--- /dev/null
+++ b/graphs/cpp/address_book/contact_details.hh
@@ -0,0 +1,15 @@
+#pragma once
+#include <string>
+
+struct ContactDetails
+{
+    static ContactDetails makeDetails(const std::string& telephone_number,
+                                      const std::string& personal_email);
+    friend std::ostream& operator<<(std::ostream& os, const ContactDetails& dt);
+
+private:
+    const std::string phone_;
+    const std::string email_;
+    ContactDetails(const std::string& telephone_number,
+                   const std::string& personal_email);
+};
\ No newline at end of file
diff --git a/graphs/cpp/address_book/main.cc b/graphs/cpp/address_book/main.cc
new file mode 100644
index 0000000..ffdb324
--- /dev/null
+++ b/graphs/cpp/address_book/main.cc
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "address_book.hh"
+
+int main()
+{
+    AddressBook b = AddressBook();
+
+    std::cout << "Adding multiple contacts to the address book.\n";
+
+    b.add("Cyril Berger", "cyril.berger@epita.fr", "33612983402");
+    b.add("Thibault Allancon", "thibault.allancon@epita.fr", "33612983409");
+    b.add("Cyril Berger", "cyril.berger@epita.fr", "33628359602");
+    b.add("Hugo Wahl", "hugo.wahl@epita.fr", "3398560923");
+    b.add("Dominique Michel", "dominique.michel@epita.fr", "3345096792");
+
+    std::cout << "Searching for Maya El Gemayel:\n";
+    auto v = b.find("Maya El Gemayel");
+    for (auto it = v.begin(); it != v.end(); it++)
+        std::cout << *it;
+
+    std::cout << "Searching for Thibault Allancon:\n";
+    v = b.find("Thibault Allancon");
+    for (auto it = v.begin(); it != v.end(); it++)
+        std::cout << *it;
+
+    std::cout << "Searching for Cyril Berger:\n";
+    v = b.find("Cyril Berger");
+    for (auto it = v.begin(); it != v.end(); it++)
+        std::cout << *it;
+
+    std::cout << b;
+
+    std::cout << "Erasing the second Cyril Berger.\n";
+    b.remove("Cyril Berger", 1);
+
+    std::cout << b;
+
+    return 0;
+}
diff --git a/graphs/cpp/antagonist/CMakeLists.txt b/graphs/cpp/antagonist/CMakeLists.txt
new file mode 100644
index 0000000..7620cb4
--- /dev/null
+++ b/graphs/cpp/antagonist/CMakeLists.txt
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.21.2)
+project(beaver_run)
+
+add_executable(beaver_run)
+add_subdirectory(test)
+target_compile_options(beaver_run PRIVATE -Wall -Wextra -Werror -pedantic -std=c++20 -Wold-style-cast)
+set_target_properties(beaver_run PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF)
+add_subdirectory(src)
+
+target_link_libraries(beaver_run PUBLIC libbeaver)
+target_include_directories(beaver_run PUBLIC
+        "${PROJECT_BINARY_DIR}"
+        "${PROJECT_SOURCE_DIR}/include"
+)
+target_include_directories(libbeaver PUBLIC
+        "${PROJECT_BINARY_DIR}"
+        "${PROJECT_SOURCE_DIR}/include"
+)
\ No newline at end of file
diff --git a/graphs/cpp/antagonist/include/libbeaver/beaver.hh b/graphs/cpp/antagonist/include/libbeaver/beaver.hh
new file mode 100644
index 0000000..ac5cbe4
--- /dev/null
+++ b/graphs/cpp/antagonist/include/libbeaver/beaver.hh
@@ -0,0 +1,18 @@
+#include <memory>
+
+namespace beaver
+{
+    class Beaver
+    {
+    public:
+        virtual ~Beaver() = default;
+
+        virtual const std::string& get_name() const = 0;
+
+        virtual void display_video() = 0;
+    };
+
+    std::unique_ptr<Beaver> make_beaver(const std::string& name,
+                                        const std::string& video_path);
+
+} // namespace beaver
diff --git a/graphs/cpp/antagonist/src/CMakeLists.txt b/graphs/cpp/antagonist/src/CMakeLists.txt
new file mode 100644
index 0000000..8dd9272
--- /dev/null
+++ b/graphs/cpp/antagonist/src/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.21.2)
+
+add_library(libbeaver SHARED)
+
+target_compile_options(libbeaver PUBLIC -Wall -Wextra -Werror -pedantic -std=c++20 -Wold-style-cast)
+set_target_properties(libbeaver PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF
+        LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}"
+        OUTPUT_NAME "beaver" )
+target_include_directories(libbeaver PRIVATE
+        "${PROJECT_SOURCE_DIR}/include"
+        "${PROJECT_SOURCE_DIR}/src"
+)
+
+find_package(OpenCV REQUIRED)
+target_link_libraries(libbeaver PUBLIC ${OpenCV_LIBS})
+add_subdirectory(video_player)
+add_subdirectory(beaver)
\ No newline at end of file
diff --git a/graphs/cpp/antagonist/src/beaver/CMakeLists.txt b/graphs/cpp/antagonist/src/beaver/CMakeLists.txt
new file mode 100644
index 0000000..13a04a6
--- /dev/null
+++ b/graphs/cpp/antagonist/src/beaver/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.21.2)
+
+target_sources(libbeaver PRIVATE beaver.cc beaver_impl.cc)
+set_target_properties(libbeaver PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF)
\ No newline at end of file
diff --git a/graphs/cpp/antagonist/src/beaver/beaver.cc b/graphs/cpp/antagonist/src/beaver/beaver.cc
new file mode 100644
index 0000000..57a612c
--- /dev/null
+++ b/graphs/cpp/antagonist/src/beaver/beaver.cc
@@ -0,0 +1,12 @@
+#include <string>
+
+#include "beaver_impl.hh"
+
+namespace beaver
+{
+    std::unique_ptr<Beaver> make_beaver(const std::string& name,
+                                        const std::string& video_path)
+    {
+        return std::make_unique<BeaverImpl>(name, video_path);
+    }
+} // namespace beaver
diff --git a/graphs/cpp/antagonist/src/beaver/beaver_impl.cc b/graphs/cpp/antagonist/src/beaver/beaver_impl.cc
new file mode 100644
index 0000000..27757b5
--- /dev/null
+++ b/graphs/cpp/antagonist/src/beaver/beaver_impl.cc
@@ -0,0 +1,24 @@
+#include "beaver_impl.hh"
+
+#include <string>
+
+#include "video_player/video_player.hh"
+
+namespace beaver
+{
+    BeaverImpl::BeaverImpl(const std::string& name, std::string filename)
+        : beaver_name_(name)
+        , file_path_(filename)
+    {}
+
+    const std::string& BeaverImpl::get_name() const
+    {
+        return beaver_name_;
+    }
+
+    void BeaverImpl::display_video()
+    {
+        play_video(file_path_);
+    }
+
+} // namespace beaver
diff --git a/graphs/cpp/antagonist/src/beaver/beaver_impl.hh b/graphs/cpp/antagonist/src/beaver/beaver_impl.hh
new file mode 100644
index 0000000..02b84cc
--- /dev/null
+++ b/graphs/cpp/antagonist/src/beaver/beaver_impl.hh
@@ -0,0 +1,21 @@
+#include <libbeaver/beaver.hh>
+#include <string>
+
+namespace beaver
+{
+    class BeaverImpl : public Beaver
+    {
+    public:
+        BeaverImpl(const std::string& name, std::string filename);
+
+        ~BeaverImpl() override = default;
+
+        const std::string& get_name() const override;
+
+        void display_video() override;
+
+    private:
+        const std::string& beaver_name_;
+        std::string file_path_;
+    };
+} // namespace beaver
diff --git a/graphs/cpp/antagonist/src/video_player/CMakeLists.txt b/graphs/cpp/antagonist/src/video_player/CMakeLists.txt
new file mode 100644
index 0000000..0420a11
--- /dev/null
+++ b/graphs/cpp/antagonist/src/video_player/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.21.2)
+
+target_sources(libbeaver PRIVATE video_player.cc)
+set_target_properties(libbeaver PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF)
\ No newline at end of file
diff --git a/graphs/cpp/antagonist/src/video_player/video_player.cc b/graphs/cpp/antagonist/src/video_player/video_player.cc
new file mode 100644
index 0000000..f3b724c
--- /dev/null
+++ b/graphs/cpp/antagonist/src/video_player/video_player.cc
@@ -0,0 +1,59 @@
+#include "video_player.hh"
+
+#include <iostream>
+#include <thread>
+
+static char pixelToAscii(int pixelValue)
+{
+    const std::string ascii_chars = ".:-=+*#%@8WM";
+    int index = pixelValue * ascii_chars.length() / 256;
+    return ascii_chars[index];
+}
+
+static std::string rgbToAnsi(int r, int g, int b)
+{
+    return "\033[38;2;" + std::to_string(r) + ";" + std::to_string(g) + ";"
+        + std::to_string(b) + "m";
+}
+
+void play_video(std::string& video_path)
+{
+    std::cout << std::endl;
+    cv::VideoCapture video(video_path);
+
+    if (!video.isOpened())
+    {
+        std::cerr << "Error: Impossible to open video." << std::endl;
+        return;
+    }
+
+    cv::Mat frame, resizedFrame;
+    while (true)
+    {
+        video >> frame;
+        if (frame.empty())
+            break;
+
+        cv::resize(frame, resizedFrame, cv::Size(105, 56));
+        for (int i = 0; i < resizedFrame.rows; ++i)
+        {
+            for (int j = 0; j < resizedFrame.cols; ++j)
+            {
+                cv::Vec3b pixel = resizedFrame.at<cv::Vec3b>(i, j);
+                int blue = pixel[0];
+                int green = pixel[1];
+                int red = pixel[2];
+
+                char asciiChar = pixelToAscii((red + green + blue) / 3);
+                std::string colorCode = rgbToAnsi(red, green, blue);
+
+                std::cout << "\033[" << i + 1 << ";" << j + 1 << "H";
+                std::cout << colorCode << asciiChar;
+            }
+        }
+        std::this_thread::sleep_for(std::chrono::milliseconds(20));
+        std::cout << "\033[0m";
+    }
+    video.release();
+    std::cout << std::endl;
+}
diff --git a/graphs/cpp/antagonist/src/video_player/video_player.hh b/graphs/cpp/antagonist/src/video_player/video_player.hh
new file mode 100644
index 0000000..3854bdf
--- /dev/null
+++ b/graphs/cpp/antagonist/src/video_player/video_player.hh
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <iostream>
+#include <opencv2/opencv.hpp>
+#include <string>
+
+/**
+ * @brief Plays a given video file.
+ *
+ * @param video_path The path to the video file to play.
+ */
+void play_video(std::string& video_path);
diff --git a/graphs/cpp/antagonist/test/CMakeLists.txt b/graphs/cpp/antagonist/test/CMakeLists.txt
new file mode 100644
index 0000000..b05b260
--- /dev/null
+++ b/graphs/cpp/antagonist/test/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.21.2)
+
+target_sources(beaver_run PUBLIC main.cc)
+set_target_properties(beaver_run PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF)
+file(
+        COPY ${CMAKE_CURRENT_SOURCE_DIR}/video/
+        DESTINATION "${CMAKE_BINARY_DIR}/video"
+)
\ No newline at end of file
diff --git a/graphs/cpp/antagonist/test/main.cc b/graphs/cpp/antagonist/test/main.cc
new file mode 100644
index 0000000..96d267d
--- /dev/null
+++ b/graphs/cpp/antagonist/test/main.cc
@@ -0,0 +1,10 @@
+#include <iostream>
+#include <libbeaver/beaver.hh>
+
+int main(void)
+{
+    auto bearer_roll = beaver::make_beaver("Frankulin", "video/video.mp4");
+
+    bearer_roll->display_video();
+    std::cout << bearer_roll->get_name() << std::endl;
+}
diff --git a/graphs/cpp/antagonist/test/video/video.mp4 b/graphs/cpp/antagonist/test/video/video.mp4
new file mode 100644
index 0000000..7b788c6
--- /dev/null
+++ b/graphs/cpp/antagonist/test/video/video.mp4
diff --git a/graphs/cpp/bimap/bimap.hh b/graphs/cpp/bimap/bimap.hh
new file mode 100644
index 0000000..25f459d
--- /dev/null
+++ b/graphs/cpp/bimap/bimap.hh
@@ -0,0 +1,36 @@
+#pragma once
+
+#include <map>
+
+    template <typename Lhs, typename Rhs>
+    class Bimap
+{
+    static_assert(!std::is_same_v<Lhs, Rhs>,
+                  "Lhs and Rhs must be different types");
+    using mapLhs = std::map<Lhs, Rhs>;
+    using mapRhs = std::map<Rhs, Lhs>;
+    using iteratorLhs = typename mapLhs::const_iterator;
+    using iteratorRhs = typename mapRhs::const_iterator;
+
+public:
+    bool insert(const Lhs& vl, const Rhs& vr);
+    bool insert(const Rhs& vr, const Lhs& vl);
+
+    std::size_t erase(const Lhs& vl);
+    std::size_t erase(const Rhs& vr);
+
+    iteratorLhs find(const Lhs& vl) const;
+    iteratorRhs find(const Rhs& vr) const;
+
+    std::size_t size() const;
+    void clear();
+
+    const mapLhs& get_lhs() const;
+    const mapRhs& get_rhs() const;
+
+private:
+    mapLhs lhs_;
+    mapRhs rhs_;
+};
+
+#include "bimap.hxx"
diff --git a/graphs/cpp/bimap/bimap.hxx b/graphs/cpp/bimap/bimap.hxx
new file mode 100644
index 0000000..9b1eb1f
--- /dev/null
+++ b/graphs/cpp/bimap/bimap.hxx
@@ -0,0 +1,74 @@
+#pragma once
+#include "bimap.hh"
+
+template <typename Lhs, typename Rhs>
+bool Bimap<Lhs, Rhs>::insert(const Lhs& vl, const Rhs& vr)
+{
+    if (lhs_.contains(vl) || rhs_.contains(vr))
+        return false;
+    if (lhs_.contains(vl) || !lhs_.insert({ vl, vr }).second)
+        return false;
+    if (rhs_.contains(vr) || !rhs_.insert({ vr, vl }).second)
+        return false;
+    return true;
+}
+template <typename Lhs, typename Rhs>
+bool Bimap<Lhs, Rhs>::insert(const Rhs& vr, const Lhs& vl)
+{
+    return insert(vl, vr);
+}
+template <typename Lhs, typename Rhs>
+std::size_t Bimap<Lhs, Rhs>::erase(const Lhs& vl)
+{
+    if (lhs_.size() <= 0)
+        return 0;
+    auto range = lhs_.find(vl);
+    if (range == lhs_.end())
+        return 0;
+    rhs_.erase(range->second);
+    size_t n = lhs_.erase(range->first);
+    return n;
+}
+template <typename Lhs, typename Rhs>
+std::size_t Bimap<Lhs, Rhs>::erase(const Rhs& vr)
+{
+    if (lhs_.size() <= 0)
+        return 0;
+    auto range = rhs_.find(vr);
+    if (range == rhs_.end())
+        return 0;
+    lhs_.erase(range->second);
+    size_t n = rhs_.erase(range->first);
+    return n;
+}
+template <typename Lhs, typename Rhs>
+typename Bimap<Lhs, Rhs>::iteratorLhs Bimap<Lhs, Rhs>::find(const Lhs& vl) const
+{
+    return lhs_.find(vl);
+}
+template <typename Lhs, typename Rhs>
+typename Bimap<Lhs, Rhs>::iteratorRhs Bimap<Lhs, Rhs>::find(const Rhs& vr) const
+{
+    return rhs_.find(vr);
+}
+template <typename Lhs, typename Rhs>
+std::size_t Bimap<Lhs, Rhs>::size() const
+{
+    return lhs_.size();
+}
+template <typename Lhs, typename Rhs>
+void Bimap<Lhs, Rhs>::clear()
+{
+    lhs_ = {};
+    rhs_ = {};
+}
+template <typename Lhs, typename Rhs>
+const typename Bimap<Lhs, Rhs>::mapLhs& Bimap<Lhs, Rhs>::get_lhs() const
+{
+    return lhs_;
+}
+template <typename Lhs, typename Rhs>
+const typename Bimap<Lhs, Rhs>::mapRhs& Bimap<Lhs, Rhs>::get_rhs() const
+{
+    return rhs_;
+}
\ No newline at end of file
diff --git a/graphs/cpp/bimap/bimap_example.cc b/graphs/cpp/bimap/bimap_example.cc
new file mode 100644
index 0000000..771a2b0
--- /dev/null
+++ b/graphs/cpp/bimap/bimap_example.cc
@@ -0,0 +1,26 @@
+#include <iostream>
+#include <string>
+
+#include "bimap.hh"
+
+int main()
+{
+    Bimap<int, std::string> bm;
+
+    bm.insert(16, "Test.");
+    bm.insert("Prologin", 29);
+
+    std::cout << "The bimap contains: " << bm.size() << " elements\n";
+
+    auto it1 = bm.find("Test.");
+    auto it2 = bm.find(29);
+
+    std::cout << it1->first << ' ' << it1->second << '\n';
+    std::cout << it2->first << ' ' << it2->second << '\n';
+
+    bm.erase(16);
+    bm.erase("Prologin");
+
+    bm.clear();
+    return 0;
+}
diff --git a/graphs/cpp/cartesian_vector/format_numerical_data.cc b/graphs/cpp/cartesian_vector/format_numerical_data.cc
new file mode 100644
index 0000000..b6355d2
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/format_numerical_data.cc
@@ -0,0 +1,13 @@
+#include "format_numerical_data.hh"
+std::ostream& FormatNumericalData::formatOs(std::ostream& os) const
+{
+    if (precision >= 0)
+    {
+        os.precision(precision);
+    }
+    if (scientific_notation)
+        std::scientific(os);
+    if (display_plus)
+        std::showpos(os);
+    return os;
+}
\ No newline at end of file
diff --git a/graphs/cpp/cartesian_vector/format_numerical_data.hh b/graphs/cpp/cartesian_vector/format_numerical_data.hh
new file mode 100644
index 0000000..359e297
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/format_numerical_data.hh
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <ostream>
+#include <string>
+
+struct FormatNumericalData
+{
+    //! string to be printed before the data
+    std::string prefix;
+    //! string to be printed after the data
+    std::string suffix;
+    //! gives the minimum number of digits to appear (after the radix if
+    //! scientific_notation is enabled)
+    int precision = -1;
+    //! define if scientific notation is enabled
+    bool scientific_notation = false;
+    //! define if a sign + should be placed before a number
+    bool display_plus = false;
+
+    //! format the given stream according to class attributes
+    std::ostream& formatOs(std::ostream& os) const;
+};
diff --git a/graphs/cpp/cartesian_vector/state_saver.cc b/graphs/cpp/cartesian_vector/state_saver.cc
new file mode 100644
index 0000000..4b4a244
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/state_saver.cc
@@ -0,0 +1,11 @@
+#include "state_saver.hh"
+StateSaver::StateSaver(std::ostream& os)
+    : saved_stream_{ os }
+    , saved_flags_{ os.flags() }
+    , saved_precision_{ os.precision() }
+{}
+StateSaver::~StateSaver()
+{
+    saved_stream_.flags(saved_flags_);
+    saved_stream_.precision(saved_precision_);
+}
\ No newline at end of file
diff --git a/graphs/cpp/cartesian_vector/state_saver.hh b/graphs/cpp/cartesian_vector/state_saver.hh
new file mode 100644
index 0000000..f52127c
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/state_saver.hh
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <iostream>
+
+class StateSaver
+{
+public:
+    //! constructor should save all flags and precision
+    StateSaver(std::ostream& os);
+    //! destructor should restore all flags and precision
+    ~StateSaver();
+
+private:
+    //! original stream
+    std::ostream& saved_stream_;
+    //! flags of the original stream
+    std::ios_base::fmtflags saved_flags_;
+    //! precision of the original stream
+    std::streamsize saved_precision_;
+};
diff --git a/graphs/cpp/cartesian_vector/vector.cc b/graphs/cpp/cartesian_vector/vector.cc
new file mode 100644
index 0000000..1291f69
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/vector.cc
@@ -0,0 +1,69 @@
+#include "vector.hh"
+
+#include "state_saver.hh"
+
+Vector::Vector(double x, double y)
+    : x_{ x }
+    , y_{ y }
+{}
+double Vector::get_x() const
+{
+    return x_;
+}
+double Vector::get_y() const
+{
+    return y_;
+}
+Vector& Vector::operator+=(const Vector& rhs)
+{
+    x_ += rhs.get_x();
+    y_ += rhs.get_y();
+    return *this;
+}
+Vector& Vector::operator-=(const Vector& rhs)
+{
+    x_ -= rhs.get_x();
+    y_ -= rhs.get_y();
+    return *this;
+}
+Vector& Vector::operator*=(double scalar)
+{
+    x_ *= scalar;
+    y_ *= scalar;
+    return *this;
+}
+Vector operator+(const Vector& lhs, const Vector& rhs)
+{
+    Vector lhs1{ lhs };
+    return lhs1 += rhs;
+}
+Vector operator-(const Vector& lhs, const Vector& rhs)
+{
+    Vector lhs1{ lhs };
+    return lhs1 -= rhs;
+}
+Vector operator*(const Vector& lhs, double scalar)
+{
+    Vector lhs1{ lhs };
+    return lhs1 *= scalar;
+}
+Vector operator*(double scalar, const Vector& rhs)
+{
+    return rhs * scalar;
+}
+double operator*(const Vector& lhs, const Vector& rhs)
+{
+    return lhs.get_x() * rhs.get_x() + lhs.get_y() * rhs.get_y();
+}
+
+FormatNumericalData Vector::format_numerical_data_{ "[ ", " ]", 12, true,
+                                                    true };
+
+std::ostream& operator<<(std::ostream& os, const Vector& vec)
+{
+    StateSaver savestate{ os };
+    Vector::format_numerical_data_.formatOs(os);
+    os << Vector::format_numerical_data_.prefix << vec.get_x() << " , "
+       << vec.get_y() << Vector::format_numerical_data_.suffix;
+    return os;
+}
\ No newline at end of file
diff --git a/graphs/cpp/cartesian_vector/vector.hh b/graphs/cpp/cartesian_vector/vector.hh
new file mode 100644
index 0000000..b18838c
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/vector.hh
@@ -0,0 +1,29 @@
+#pragma once
+#include <iostream>
+
+#include "format_numerical_data.hh"
+
+class Vector
+{
+public:
+    Vector() = default;
+    Vector(double x, double y);
+    double get_x() const;
+    double get_y() const;
+
+    Vector& operator+=(const Vector& rhs);
+    Vector& operator-=(const Vector& rhs);
+    Vector& operator*=(double scalar);
+
+    friend Vector operator+(const Vector& lhs, const Vector& rhs);
+    friend Vector operator-(const Vector& lhs, const Vector& rhs);
+    friend Vector operator*(const Vector& lhs, double scalar);
+    friend Vector operator*(double scalar, const Vector& rhs);
+    friend double operator*(const Vector& lhs, const Vector& rhs);
+    friend std::ostream& operator<<(std::ostream& os, const Vector& vec);
+
+private:
+    double x_ = 0;
+    double y_ = 0;
+    static FormatNumericalData format_numerical_data_;
+};
diff --git a/graphs/cpp/cartesian_vector/vector_test.cc b/graphs/cpp/cartesian_vector/vector_test.cc
new file mode 100644
index 0000000..d822c9f
--- /dev/null
+++ b/graphs/cpp/cartesian_vector/vector_test.cc
@@ -0,0 +1,27 @@
+#include <cmath>
+#include <iostream>
+
+#include "vector.hh"
+
+double pi()
+{
+    return std::atan2(0., -1.);
+}
+
+int main()
+{
+    std::cout << "default state pi (double) : " << pi() << '\n';
+    Vector piVector{ pi(), pi() };
+    Vector t(-1.0E-7, 6.812031E-4);
+    std::cout << "piVector :\n" << piVector << '\n';
+    std::cout << "t + piVector :\n" << t + piVector << '\n';
+
+    Vector u{ 1923, 8 };
+    std::cout << "u :\n" << u << '\n';
+    std::cout << "default state (double) : " << u * t << '\n';
+    t -= u;
+    std::cout << "t :\n" << t << '\n';
+    std::cout << "t * 3 :\n" << t * 3 << '\n';
+
+    return 0;
+}
diff --git a/graphs/cpp/caste_or_cast/Makefile b/graphs/cpp/caste_or_cast/Makefile
new file mode 100644
index 0000000..c49f282
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/Makefile
@@ -0,0 +1,15 @@
+CXX ?= g++
+CXXFLAGS= -std=c++20 -Wall -Wextra -Werror -pedantic \
+		  -Wold-style-cast
+
+OBJS = ant.o worker.o nurturer.o provider.o queen.o colony.o main_example.o
+
+all: my_colony
+
+my_colony: $(OBJS)
+	$(CXX) -o $@ $^
+
+clean:
+	$(RM) $(OBJS) my_colony
+.PHONY:
+	clean
diff --git a/graphs/cpp/caste_or_cast/ant.cc b/graphs/cpp/caste_or_cast/ant.cc
new file mode 100644
index 0000000..2875815
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/ant.cc
@@ -0,0 +1,87 @@
+#include "ant.hh"
+
+// The Colony class was forward declared in Ant header
+// We need to include its header here so we know Colony implementation
+#include "colony.hh"
+
+Ant::Ant(std::shared_ptr<Colony> colony, DevelopmentStage stage)
+    : stage_(stage)
+    , colony_(colony)
+{}
+
+Ant::Ant(const Ant& o)
+    : stage_(o.stage_)
+    , colony_(o.colony_)
+    , hp_(o.hp_)
+    , food_level_(o.food_level_)
+{}
+
+Ant& Ant::operator=(const Ant& o)
+{
+    stage_ = o.stage_;
+    colony_ = o.colony_;
+    hp_ = o.hp_;
+    food_level_ = o.food_level_;
+    return *this;
+}
+
+std::shared_ptr<Colony> Ant::check_colony_access()
+{
+    std::shared_ptr<Colony> colony = colony_.lock();
+    if (colony == nullptr)
+        throw std::runtime_error("The Colony pointer is expired.");
+    return colony;
+}
+
+bool Ant::communicate(std::weak_ptr<Ant> wk_receiver)
+{
+    std::shared_ptr<Ant> receiver = wk_receiver.lock();
+    if (receiver == nullptr || stage_ != DevelopmentStage::ADULT
+        || receiver->get_stage() != DevelopmentStage::ADULT)
+        return false;
+    if (receiver->get_passport_pheromone() != get_passport_pheromone())
+        return attack(receiver);
+    return true;
+}
+
+bool Ant::attack(std::weak_ptr<Ant> wk_ant)
+{
+    if (std::shared_ptr<Ant> ant = wk_ant.lock())
+    {
+        ant->hp_ -= 1;
+        return true;
+    }
+    else
+        return false;
+}
+
+uint32_t Ant::get_passport_pheromone()
+{
+    auto c = check_colony_access();
+    return c->passport_pheromone_;
+}
+
+DevelopmentStage Ant::get_stage() const
+{
+    return stage_;
+}
+
+int Ant::get_hp() const
+{
+    return hp_;
+}
+
+void Ant::set_hp(int hp)
+{
+    hp_ = hp;
+}
+
+float Ant::get_food_level() const
+{
+    return food_level_;
+}
+
+void Ant::increment_food_level_by(float value)
+{
+    food_level_ += value;
+}
diff --git a/graphs/cpp/caste_or_cast/ant.hh b/graphs/cpp/caste_or_cast/ant.hh
new file mode 100644
index 0000000..6a0a0ee
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/ant.hh
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <memory>
+
+//! forward declaration
+class Colony;
+
+/*
+ * Enum Class representing the stage of life for
+ * an ant
+ */
+enum class DevelopmentStage : unsigned int
+{
+    // from the youngest to the oldest stage
+    EGG = 0,
+    LARVA,
+    COCOON,
+    ADULT
+};
+
+/*
+ *  Base Class for every ant caste
+ */
+class Ant
+{
+public:
+    //! delete constructor
+    Ant() = delete;
+    //! constructor
+    Ant(std::shared_ptr<Colony> colony,
+        DevelopmentStage stage = DevelopmentStage::EGG);
+    //! copy constructor
+    Ant(const Ant&);
+    //! copy assignement
+    Ant& operator=(const Ant&);
+    //! default virtual destructor
+    virtual ~Ant() = default;
+    //! communicate with another Ant
+    virtual bool communicate(std::weak_ptr<Ant> wk_receiver);
+    //! attack given Ant and check if it is dead
+    bool attack(std::weak_ptr<Ant> wk_ant);
+
+    //! getter for passport_pheromone_ of Colony class
+    uint32_t get_passport_pheromone();
+    //! getter for stage_
+    DevelopmentStage get_stage() const;
+    //! getter for hp_
+    int get_hp() const;
+    //! setter for hp_
+    void set_hp(int hp);
+    //! getter for food_level_
+    float get_food_level() const;
+    //! increment by value food_level_
+    void increment_food_level_by(float value);
+
+protected:
+    //! return by value the colony shared_ptr if not expired else throw error
+    std::shared_ptr<Colony> check_colony_access();
+    //! development stage
+    DevelopmentStage stage_;
+    //! Colony of this Ant
+    std::weak_ptr<Colony> colony_;
+    //! health points
+    int hp_ = 4;
+    //! represent the energy / food the ant ate for its
+    // current Development stage
+    float food_level_ = 0;
+    //! friend class
+    friend class Colony;
+};
diff --git a/graphs/cpp/caste_or_cast/colony.cc b/graphs/cpp/caste_or_cast/colony.cc
new file mode 100644
index 0000000..2c0697a
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/colony.cc
@@ -0,0 +1,116 @@
+#include "colony.hh"
+
+#include <iostream>
+
+#include "nurturer.hh"
+#include "provider.hh"
+
+Colony::Colony(uint32_t passport)
+    : passport_pheromone_(passport)
+    , workers_()
+{}
+bool Colony::addAnt(const Ant& ant, std::shared_ptr<Colony> colony)
+{
+    auto q = dynamic_cast<const Queen*>(&ant);
+    if (q)
+    {
+        if (colony->queen_ || q->get_stage() != DevelopmentStage::ADULT)
+            return false;
+        colony->queen_ = std::make_unique<Queen>(*q);
+        return true;
+    }
+    auto n = dynamic_cast<const Nurturer*>(&ant);
+    if (n)
+    {
+        colony->workers_.push_back(std::make_shared<Nurturer>(*n));
+        return true;
+    }
+    auto p = dynamic_cast<const Provider*>(&ant);
+    if (p)
+    {
+        colony->workers_.push_back(std::make_shared<Provider>(*p));
+        return true;
+    }
+    return false;
+}
+
+void Colony::manageQueen()
+{
+    if (queen_ == nullptr)
+        throw std::runtime_error("Cannot manage a colony without a Queen.");
+    // check if the queen should lose health points
+    if (queen_->food_level_ < 0)
+        queen_->hp_ -= 1;
+    if (queen_->hp_ <= 0)
+    {
+        queen_ = nullptr;
+        throw std::runtime_error("The Queen died.");
+    }
+    // Append to workers_ all the new workers contained in the queen's
+    // eggs_queue_
+    while (!queen_->eggs_queue_.empty())
+    {
+        //! we insert eggs that were laid by the queen
+        workers_.emplace_back(queen_->eggs_queue_.front());
+        queen_->eggs_queue_.pop();
+    }
+}
+
+void Colony::removeDeadWorkers()
+{
+    auto dead_count = std::erase_if(
+        workers_, [](const std::shared_ptr<Worker> w) { return w->hp_ <= 0; });
+    if (dead_count > 0)
+    {
+        std::cout << dead_count << " workers_ died.\n";
+        // each dead worker decrease the cleanliness of the colony
+        cleanliness -= 0.5 * dead_count;
+    }
+}
+
+// this method can be considered as one round of management
+void Colony::manageAnts()
+{
+    // We first manage the queen
+    manageQueen();
+    // We remove all dead workers contained in workers_
+    removeDeadWorkers();
+    std::cout << "-- THERE ARE " << workers_.size() << " WORKERS --\n";
+    // We iterate over all workers
+    for (auto worker : workers_)
+    {
+        if (worker->stage_ == DevelopmentStage::ADULT)
+        {
+            /*
+             * Because work() is a virtual method, dynamic dispatch will be
+             * used. Which means that the overridden work method of the true
+             * type (either Nurturer or Provider) will actually be called
+             * instead of Worker::work().
+             */
+            worker->work();
+        }
+        else
+        {
+            /*
+             * We increment their food_level_ as if it is a ticking time,
+             * EXCEPT for the larvae, as they are fed by nurturers.
+             */
+            if (worker->stage_ != DevelopmentStage::LARVA)
+                worker->food_level_ += 1;
+            if (worker->food_level_ >= 4.0)
+            {
+                /* FIXME : Make the worker change stage_ and reset their
+                 * food_level_ to 0. HINT : This can take only 2/3 lines if
+                 * you use a certain C++ cast instead of a switch.
+                 */
+                worker->food_level_ = 0;
+                auto ant = static_cast<Ant*>(worker.get());
+                ant->stage_ = static_cast<DevelopmentStage>(
+                    static_cast<int>(ant->stage_) + 1);
+            }
+        }
+    }
+    queen_->food_level_ -= 0.2;
+}
+
+// FIXME : Implements addAnt() static method.
diff --git a/graphs/cpp/caste_or_cast/colony.hh b/graphs/cpp/caste_or_cast/colony.hh
new file mode 100644
index 0000000..917ebf8
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/colony.hh
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <vector>
+
+#include "queen.hh"
+#include "worker.hh"
+
+//! forward declarations
+class Provider;
+class Nurturer;
+
+/*
+ * Colony class that acts as one entity and manage all of its ants
+ */
+class Colony
+{
+public:
+    //! constructor
+    Colony(uint32_t passport);
+    //! static method that adds a COPY of the given ant to the given colony
+    static bool addAnt(const Ant& ant, std::shared_ptr<Colony> colony);
+    //! manage all the ants, can be understood as one round
+    void manageAnts();
+    //! overall cleanliness of the colony
+    float cleanliness = 100;
+
+private:
+    //! manage the queen (is alive etc.)
+    void manageQueen();
+    //! remove all the dead workers of the workers_ vector
+    void removeDeadWorkers();
+    //! attribute used to recognise if an Ant is from the same colony
+    uint32_t passport_pheromone_;
+    //! vector of all workers of the colony, each worker is stored in a
+    //! shared_ptr
+    std::vector<std::shared_ptr<Worker>> workers_;
+    //! unique queen, only its colony have the ownership of it.
+    std::unique_ptr<Queen> queen_ = nullptr;
+
+    //! friend classes
+    friend class Ant;
+    friend class Nurturer;
+};
diff --git a/graphs/cpp/caste_or_cast/main_example.cc b/graphs/cpp/caste_or_cast/main_example.cc
new file mode 100644
index 0000000..9708df0
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/main_example.cc
@@ -0,0 +1,37 @@
+#include <iostream>
+
+#include "colony.hh"
+#include "nurturer.hh"
+#include "provider.hh"
+
+int main()
+{
+    std::shared_ptr<Colony> myColony = std::make_shared<Colony>(10);
+
+    Queen queen(myColony, DevelopmentStage::ADULT);
+    queen.increment_food_level_by(3.4);
+
+    std::cout << std::boolalpha << Colony::addAnt(queen, myColony) << " ";
+
+    // create provider with luck_ = 1.32
+    Provider provider(myColony, 1.32, DevelopmentStage::ADULT);
+
+    // create nurturer with default luck and 54.289 food_stock_
+    Nurturer nurturer(myColony, DevelopmentStage::ADULT);
+    nurturer.increment_food_stock_by(54.289);
+
+    // create larva with food_level_ = 3
+    Provider larva(myColony, DevelopmentStage::LARVA);
+    larva.increment_food_level_by(3);
+
+    std::cout << std::boolalpha << Colony::addAnt(nurturer, myColony) << " ";
+    std::cout << std::boolalpha << Colony::addAnt(larva, myColony) << " ";
+    std::cout << std::boolalpha << Colony::addAnt(provider, myColony) << '\n';
+
+    for (size_t i = 0; i < 8; i++)
+        myColony->manageAnts();
+    /*
+     * Don't forget to test the communication methods of your ants.
+     */
+    return 0;
+}
diff --git a/graphs/cpp/caste_or_cast/nurturer.cc b/graphs/cpp/caste_or_cast/nurturer.cc
new file mode 100644
index 0000000..09faa79
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/nurturer.cc
@@ -0,0 +1,98 @@
+#include "nurturer.hh"
+
+#include <iostream>
+
+// The Colony class was forward declared in Ant header
+// We need to include its header here so we know Colony implementation
+#include "colony.hh"
+#include "provider.hh"
+
+void Nurturer::feedLarvae()
+{
+    if (food_stock_ < 0.5)
+        return;
+    size_t count = 0;
+    std::shared_ptr<Colony> colony = check_colony_access();
+    for (auto i = colony->workers_.begin(); i < colony->workers_.end(); i++)
+    {
+        // if it doesn't have food anymore, can't feed more larvae
+        if (food_stock_ < 0.5)
+            break;
+        std::shared_ptr<Worker> worker = *i;
+        // only feed if it is a larvae and if it is not already full (its
+        // food_level_ => 4)
+        if (DevelopmentStage::LARVA == worker->get_stage()
+            && worker->get_food_level() < 4)
+        {
+            worker->increment_food_level_by(0.5);
+            food_stock_ -= 0.5;
+            colony->cleanliness -= 0.3;
+            food_level_ -= 0.03;
+            count++;
+        }
+    }
+    std::cout << count << " larvae were fed by nurturer.\n";
+}
+
+void Nurturer::work()
+{
+    if (stage_ != DevelopmentStage::ADULT)
+        return;
+    if (food_stock_ > 0.5)
+    {
+        // eat before working
+        food_level_ += 0.5;
+        food_stock_ -= 0.5;
+        // complete its tasks
+        feedLarvae();
+        feedQueen();
+        cleanNest();
+    }
+    else
+        // make the ant more hungry
+        food_level_ -= 0.042;
+    //! call base class work() method
+    Worker::work();
+}
+bool Nurturer::communicate(std::weak_ptr<Ant> wk_receiver)
+{
+    if (wk_receiver.lock() == nullptr)
+        return false;
+    if (!Ant::communicate(wk_receiver))
+        return false;
+    std::cout << "Nurturer initiates communication.\n";
+    auto p = dynamic_cast<Provider*>(wk_receiver.lock().get());
+    if (p)
+    {
+        p->transferFood(*this);
+    }
+    return true;
+}
+void Nurturer::feedQueen()
+{
+    if (food_stock_ < 1)
+        return;
+    std::cout << "Feeding Queen.\n";
+    auto c = check_colony_access();
+    c->queen_->increment_food_level_by(1);
+    food_stock_--;
+    if (static_cast<int>(c->queen_->get_food_level()) > 0
+        && static_cast<int>(c->queen_->get_food_level()) % 6 == 0)
+        c->queen_->layEgg();
+    c->cleanliness -= .2;
+}
+
+void Nurturer::cleanNest()
+{
+    std::shared_ptr<Colony> colony = check_colony_access();
+    if (colony->cleanliness < 100)
+    {
+        // clean the nest according to the luck of the Nurturer
+        std::cout << "Cleaning nest: gained " << luck_ << " of cleanliness.\n";
+        auto cleanliness = colony->cleanliness + luck_;
+        colony->cleanliness = (cleanliness > 100) ? 100 : cleanliness;
+    }
+}
+
+// FIXME : Implements communicate(std::weak_ptr<Ant>) virtual overridden method
+// and feedQueen()
diff --git a/graphs/cpp/caste_or_cast/nurturer.hh b/graphs/cpp/caste_or_cast/nurturer.hh
new file mode 100644
index 0000000..af7eec7
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/nurturer.hh
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "worker.hh"
+
+/*
+ * Nurturers worker sub-caste
+ */
+class Nurturer : public Worker
+{
+public:
+    //! inherit Worker Constructors
+    using Worker::Worker;
+    //! final override of the work() Worker virtual method
+    void work() override final;
+
+    /*!
+     * @details final override of the communicate() Ant virtual method
+     * @return true if the communication succeeded
+     * */
+    bool communicate(std::weak_ptr<Ant> wk_receiver) override final;
+    //! feed the queen
+    void feedQueen();
+    //! feed larvae
+    void feedLarvae();
+    //! clean the nest / colony
+    void cleanNest();
+};
diff --git a/graphs/cpp/caste_or_cast/provider.cc b/graphs/cpp/caste_or_cast/provider.cc
new file mode 100644
index 0000000..5767743
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/provider.cc
@@ -0,0 +1,47 @@
+//
+// Created by martial.simon on 2/26/25.
+//
+#include "provider.hh"
+
+#include <iostream>
+
+#include "nurturer.hh"
+#include "queen.hh"
+void Provider::work()
+{
+    if (stage_ != DevelopmentStage::ADULT)
+        return;
+    food_level_ += food_stock_ - static_cast<int>(food_stock_);
+    food_stock_ -= food_stock_ - static_cast<int>(food_stock_);
+    harvestFood();
+    Worker::work();
+}
+void Provider::transferFood(Nurturer& nurturer)
+{
+    if (food_stock_ < 1)
+        return;
+    nurturer.increment_food_stock_by(static_cast<int>(food_stock_));
+    food_stock_ -= static_cast<int>(food_stock_);
+    std::cout << "Transferring food.\n";
+}
+void Provider::harvestFood()
+{
+    float harvest = luck_;
+    std::cout << "Harvested " << harvest << " food.\n";
+    food_stock_ += harvest;
+    food_level_ -= (harvest - static_cast<int>(harvest)) * 0.5;
+}
+bool Provider::communicate(std::weak_ptr<Ant> wk_receiver)
+{
+    if (wk_receiver.lock() == nullptr)
+        return false;
+    if (!Ant::communicate(wk_receiver))
+        return false;
+    std::cout << "Provider initiates communication.\n";
+    auto p = dynamic_cast<Nurturer*>(wk_receiver.lock().get());
+    if (p)
+    {
+        transferFood(*p);
+    }
+    return true;
+}
\ No newline at end of file
diff --git a/graphs/cpp/caste_or_cast/provider.hh b/graphs/cpp/caste_or_cast/provider.hh
new file mode 100644
index 0000000..5076585
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/provider.hh
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "worker.hh"
+
+//! forward declaration
+class Nurturer;
+
+/*
+ * Provider worker sub-caste :
+ *   harvest Food in the Outside World and transmit it to
+ *   Nurturers ants
+ */
+class Provider : public Worker
+{
+public:
+    //! inherit Worker Constructors
+    using Worker::Worker;
+    //! final override of the work() Worker virtual method
+    void work() override final;
+    //!  transfer food to Nurturer workers only
+    void transferFood(Nurturer& nurturer);
+    /*!
+     * @details final override of the communicate() Ant virtual method
+     * @return true if the communication succeeded
+     * */
+    bool communicate(std::weak_ptr<Ant> wk_receiver) override final;
+    //! go to the outside world and harvest food
+    void harvestFood();
+};
diff --git a/graphs/cpp/caste_or_cast/queen.cc b/graphs/cpp/caste_or_cast/queen.cc
new file mode 100644
index 0000000..d1a998f
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/queen.cc
@@ -0,0 +1,30 @@
+#include "queen.hh"
+
+#include <iostream>
+
+#include "colony.hh"
+#include "nurturer.hh"
+#include "provider.hh"
+
+void Queen::layEgg()
+{
+    std::cout << "Queen is laying an Egg.\n";
+    // if the queen tries to lay an egg without enough food_level
+    // it loses a health point
+    if (food_level_ < 0)
+        hp_ -= 1;
+    // checking if the colony_ attribute is not expired
+    std::shared_ptr<Colony> colony = check_colony_access();
+    // either create a new Provider or a new Nurturer
+    static bool choose = false;
+    if (choose)
+        eggs_queue_.emplace(std::make_shared<Provider>(
+            colony, food_level_ * 0.5 + 0.2, DevelopmentStage::EGG));
+    else
+        eggs_queue_.emplace(std::make_shared<Nurturer>(
+            colony, food_level_ * 0.1 + 0.13, DevelopmentStage::EGG));
+    choose = !choose;
+    // consequences of laying an egg
+    colony->cleanliness -= 0.6;
+    food_level_ -= 5.7;
+}
diff --git a/graphs/cpp/caste_or_cast/queen.hh b/graphs/cpp/caste_or_cast/queen.hh
new file mode 100644
index 0000000..9192f4c
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/queen.hh
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <queue>
+
+#include "ant.hh"
+
+//! forward declaration
+class Worker;
+
+/*
+ * Class representing the Queen Caste
+ */
+class Queen : public Ant
+{
+public:
+    //! inherit Ant Constructors
+    using Ant::Ant;
+    //! the queen will create either a new Provider or Nurturer and push it to
+    //! eggs_queue_
+    void layEgg();
+
+private:
+    /*!
+     * We should not modify the Colony::workers vector while we
+     * iterate over it (because in some cases it can lead to undefined behavior)
+     * To solve this problem, we use a queue so we can save the eggs that the
+     * queen lay in one round (i.e. one call of Colony::manageAnts) and insert
+     * them in workers_ vector after we finished iterating.
+     * */
+    std::queue<std::shared_ptr<Worker>> eggs_queue_;
+    friend class Colony;
+};
diff --git a/graphs/cpp/caste_or_cast/worker.cc b/graphs/cpp/caste_or_cast/worker.cc
new file mode 100644
index 0000000..e5cb532
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/worker.cc
@@ -0,0 +1,28 @@
+#include "worker.hh"
+
+Worker::Worker(std::shared_ptr<Colony> colony, float luck,
+               DevelopmentStage stage)
+    : Ant(colony, stage)
+    , luck_(luck)
+{}
+
+void Worker::work()
+{
+    if (food_level_ < 0)
+        hp_ -= 0.5;
+}
+
+float Worker::get_luck() const
+{
+    return luck_;
+}
+
+float Worker::get_food_stock() const
+{
+    return food_stock_;
+}
+
+void Worker::increment_food_stock_by(float value)
+{
+    food_stock_ += value;
+}
diff --git a/graphs/cpp/caste_or_cast/worker.hh b/graphs/cpp/caste_or_cast/worker.hh
new file mode 100644
index 0000000..cb8c5ef
--- /dev/null
+++ b/graphs/cpp/caste_or_cast/worker.hh
@@ -0,0 +1,30 @@
+#pragma once
+
+#include "ant.hh"
+
+/*
+ * Class representing the generic Worker Caste
+ */
+class Worker : public Ant
+{
+public:
+    //! inherit Ant constructors
+    using Ant::Ant;
+    //! constructor
+    Worker(std::shared_ptr<Colony> colony, float luck,
+           DevelopmentStage stage = DevelopmentStage::EGG);
+    //! the Worker will do all of its tasks
+    virtual void work();
+    //! getter for food_stock_
+    float get_food_stock() const;
+    //! add given value to food_stock_
+    void increment_food_stock_by(float value);
+    //! return the luck of the worker
+    float get_luck() const;
+
+protected:
+    //! current food that the worker store on her.
+    float food_stock_ = 0.0;
+    //! luck of the worker
+    float luck_ = 3.141592;
+};
diff --git a/graphs/cpp/chain_of_responsibility/director.cc b/graphs/cpp/chain_of_responsibility/director.cc
new file mode 100644
index 0000000..af4072f
--- /dev/null
+++ b/graphs/cpp/chain_of_responsibility/director.cc
@@ -0,0 +1,10 @@
+#include "director.hh"
+
+#include <iostream>
+void Director::handle_request(int level)
+{
+    if (level <= 3)
+        std::cout << "Director handles\n";
+    else
+        forward_request(level);
+}
\ No newline at end of file
diff --git a/graphs/cpp/chain_of_responsibility/handler.cc b/graphs/cpp/chain_of_responsibility/handler.cc
new file mode 100644
index 0000000..256933b
--- /dev/null
+++ b/graphs/cpp/chain_of_responsibility/handler.cc
@@ -0,0 +1,19 @@
+#include "handler.hh"
+
+#include <iostream>
+Handler::Handler(Handler* next)
+    : next_{ next }
+{}
+void Handler::set_successor(Handler* h)
+{
+    next_ = h;
+}
+void Handler::forward_request(int level)
+{
+    if (next_ == nullptr)
+    {
+        std::cout << "Nobody can handle this request\n";
+    }
+    else
+        next_->handle_request(level);
+}
\ No newline at end of file
diff --git a/graphs/cpp/chain_of_responsibility/president.cc b/graphs/cpp/chain_of_responsibility/president.cc
new file mode 100644
index 0000000..9ee0566
--- /dev/null
+++ b/graphs/cpp/chain_of_responsibility/president.cc
@@ -0,0 +1,10 @@
+#include "president.hh"
+
+#include <iostream>
+void President::handle_request(int level)
+{
+    if (level <= 9)
+        std::cout << "President handles\n";
+    else
+        forward_request(level);
+}
\ No newline at end of file
diff --git a/graphs/cpp/chain_of_responsibility/vice_president.cc b/graphs/cpp/chain_of_responsibility/vice_president.cc
new file mode 100644
index 0000000..0316d63
--- /dev/null
+++ b/graphs/cpp/chain_of_responsibility/vice_president.cc
@@ -0,0 +1,10 @@
+#include "vice_president.hh"
+
+#include <iostream>
+void VicePresident::handle_request(int level)
+{
+    if (level <= 6)
+        std::cout << "VicePresident handles\n";
+    else
+        forward_request(level);
+}
\ No newline at end of file
diff --git a/graphs/cpp/closer_to/closer_to.cc b/graphs/cpp/closer_to/closer_to.cc
new file mode 100644
index 0000000..779d3b5
--- /dev/null
+++ b/graphs/cpp/closer_to/closer_to.cc
@@ -0,0 +1,15 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+#include "closer_to.hh"
+CloserTo::CloserTo(int i)
+    : i_{ i }
+{}
+bool CloserTo::operator()(int a, int b) const
+{
+    const int da = a - i_ >= 0 ? a - i_ : i_ - a;
+    const int db = b - i_ >= 0 ? b - i_ : i_ - b;
+    if (da == db)
+        return a < b;
+    return da < db;
+}
\ No newline at end of file
diff --git a/graphs/cpp/closer_to/closer_to.hh b/graphs/cpp/closer_to/closer_to.hh
new file mode 100644
index 0000000..a2462ca
--- /dev/null
+++ b/graphs/cpp/closer_to/closer_to.hh
@@ -0,0 +1,11 @@
+#pragma once
+
+struct CloserTo
+{
+    CloserTo(int i);
+
+    bool operator()(int a, int b) const;
+
+private:
+    int i_;
+};
diff --git a/graphs/cpp/closer_to/closer_to_test.cc b/graphs/cpp/closer_to/closer_to_test.cc
new file mode 100644
index 0000000..0edfd5e
--- /dev/null
+++ b/graphs/cpp/closer_to/closer_to_test.cc
@@ -0,0 +1,29 @@
+#include <algorithm>
+#include <iostream>
+#include <vector>
+
+#include "closer_to.hh"
+
+void print_elt(int i)
+{
+    std::cout << ' ' << i;
+}
+
+int main()
+{
+    auto v = std::vector<int>{ 1, 2, 3, 4, 5 };
+
+    std::cout << "Unsorted vector:";
+    std::for_each(v.begin(), v.end(), print_elt);
+    std::cout << '\n';
+
+    auto n = 3;
+
+    std::sort(v.begin(), v.end(), CloserTo(n));
+
+    std::cout << "Sorted vector closed to " << n << ':';
+    std::for_each(v.begin(), v.end(), print_elt);
+    std::cout << '\n';
+
+    return 0;
+}
diff --git a/graphs/cpp/const-td/CMakeLists.txt b/graphs/cpp/const-td/CMakeLists.txt
new file mode 100644
index 0000000..cbda23e
--- /dev/null
+++ b/graphs/cpp/const-td/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.30)
+project(const)
+
+set(CMAKE_CXX_STANDARD 20)
+
+add_executable(const main.cc)
diff --git a/graphs/cpp/const-td/main.cc b/graphs/cpp/const-td/main.cc
new file mode 100644
index 0000000..0368d13
--- /dev/null
+++ b/graphs/cpp/const-td/main.cc
@@ -0,0 +1,25 @@
+#include <iostream>
+
+std::string ohio_sigma(const std::string& name)
+{
+    return "Hello, " + name + "!";
+}
+
+size_t skibidi(std::string& name)
+{
+    name = "Hello, " + name + "!";
+    return name.length();
+}
+
+void strlen(const std::string& str, size_t* len)
+{}
+
+int main()
+{
+    auto name = "Martial";
+    std::cout << ohio_sigma(name);
+    auto new_name = std::string("Martial");
+    std::cout << "String length: " << skibidi(new_name)
+              << "\tNew string: " << new_name << "\n";
+    return 0;
+}
diff --git a/graphs/cpp/const/CMakeLists.txt b/graphs/cpp/const/CMakeLists.txt
new file mode 100644
index 0000000..800759f
--- /dev/null
+++ b/graphs/cpp/const/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.21.2)
+project(const)
+
+add_compile_options(-Wall -Wextra -Werror -pedantic -std=c++20 -Wold-style-cast)
+
+add_executable(const test_person.cc person.cc)
\ No newline at end of file
diff --git a/graphs/cpp/const/person.cc b/graphs/cpp/const/person.cc
new file mode 100644
index 0000000..63e8d73
--- /dev/null
+++ b/graphs/cpp/const/person.cc
@@ -0,0 +1,25 @@
+//
+// Created by martial.simon on 2/24/25.
+//
+#include "person.hh"
+
+Person::Person(const std::string& name, const unsigned int age)
+    : name_{ name }
+    , age_{ age }
+{}
+std::string Person::get_name() const
+{
+    return name_;
+}
+unsigned int Person::get_age() const
+{
+    return age_;
+}
+void Person::set_name(const std::string& name)
+{
+    name_ = name;
+}
+void Person::set_age(const unsigned int age)
+{
+    age_ = age;
+}
diff --git a/graphs/cpp/const/person.hh b/graphs/cpp/const/person.hh
new file mode 100644
index 0000000..0b44308
--- /dev/null
+++ b/graphs/cpp/const/person.hh
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <string>
+
+class Person
+{
+public:
+    Person(const std::string& name, const unsigned int age);
+    std::string get_name() const;
+    unsigned int get_age() const;
+    void set_name(const std::string& name);
+    void set_age(unsigned int age);
+
+private:
+    std::string name_;
+    unsigned int age_;
+};
diff --git a/graphs/cpp/const/test_person.cc b/graphs/cpp/const/test_person.cc
new file mode 100644
index 0000000..f59286e
--- /dev/null
+++ b/graphs/cpp/const/test_person.cc
@@ -0,0 +1,20 @@
+#include <iostream>
+
+#include "person.hh"
+
+int main()
+{
+    Person my_person("Gordon Freeman", 47);
+
+    const Person& my_person2 = my_person;
+
+    std::cout << "name: " << my_person2.get_name()
+              << ", years: " << my_person2.get_age() << std::endl;
+
+    std::string name = "Alyx Vance";
+    my_person.set_name(name);
+    my_person.set_age(24);
+
+    std::cout << "name: " << my_person2.get_name()
+              << ", years: " << my_person2.get_age() << std::endl;
+}
diff --git a/graphs/cpp/directories_infos/directory_info.cc b/graphs/cpp/directories_infos/directory_info.cc
new file mode 100644
index 0000000..2c28150
--- /dev/null
+++ b/graphs/cpp/directories_infos/directory_info.cc
@@ -0,0 +1,34 @@
+//
+// Created by martial.simon on 2/24/25.
+//
+#include "directory_info.hh"
+
+DirectoryInfo::DirectoryInfo(const std::string& name, size_t size,
+                             uint16_t rights, const std::string& owner)
+    : name_{ name }
+    , size_{ size }
+    , rights_{ rights }
+    , owner_{ owner }
+{
+    is_valid_ = true;
+}
+const std::string& DirectoryInfo::get_name() const
+{
+    return name_;
+}
+const std::string& DirectoryInfo::get_owner() const
+{
+    return owner_;
+}
+size_t DirectoryInfo::get_size() const
+{
+    return size_;
+}
+uint16_t DirectoryInfo::get_rights() const
+{
+    return rights_;
+}
+bool DirectoryInfo::is_valid() const
+{
+    return is_valid_;
+}
diff --git a/graphs/cpp/directories_infos/directory_info.hh b/graphs/cpp/directories_infos/directory_info.hh
new file mode 100644
index 0000000..eaf7c62
--- /dev/null
+++ b/graphs/cpp/directories_infos/directory_info.hh
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+class DirectoryInfo
+{
+public:
+    DirectoryInfo() = default;
+    DirectoryInfo(const std::string& name, size_t size, uint16_t rights,
+                  const std::string& owner);
+    const std::string& get_name() const;
+    const std::string& get_owner() const;
+    size_t get_size() const;
+    uint16_t get_rights() const;
+    bool is_valid() const;
+
+private:
+    std::string name_;
+    size_t size_;
+    uint16_t rights_;
+    std::string owner_;
+    bool is_valid_ = false;
+};
diff --git a/graphs/cpp/directories_infos/main_example.cc b/graphs/cpp/directories_infos/main_example.cc
new file mode 100644
index 0000000..db4bfa0
--- /dev/null
+++ b/graphs/cpp/directories_infos/main_example.cc
@@ -0,0 +1,32 @@
+#include <fstream>
+#include <iomanip>
+#include <iostream>
+
+#include "directory_info.hh"
+#include "read_info.hh"
+
+int main(int argc, char** argv)
+{
+    if (argc < 2)
+        return 1;
+
+    auto file = std::ifstream(argv[1]);
+
+    DirectoryInfo dir_info;
+
+    while ((dir_info = read_info(file)).is_valid())
+    {
+        std::stringstream str_stream;
+        str_stream << dir_info.get_name() << ' ' << dir_info.get_size() << ' '
+                   << std::oct << dir_info.get_rights() << std::dec << ' '
+                   << dir_info.get_owner() << '\n';
+
+        dir_info = read_info(str_stream);
+        if (!dir_info.is_valid())
+            break;
+
+        std::cout << dir_info.get_name() << '|' << dir_info.get_size() << '|'
+                  << std::oct << dir_info.get_rights() << std::dec << '|'
+                  << dir_info.get_owner() << '\n';
+    }
+}
diff --git a/graphs/cpp/directories_infos/read_info.cc b/graphs/cpp/directories_infos/read_info.cc
new file mode 100644
index 0000000..327d004
--- /dev/null
+++ b/graphs/cpp/directories_infos/read_info.cc
@@ -0,0 +1,39 @@
+#include "read_info.hh"
+
+#include <sstream>
+
+#include "directory_info.hh"
+
+DirectoryInfo read_info(std::istream& stream)
+{
+    if (stream.eof())
+    {
+        return DirectoryInfo{};
+    }
+    std::string l;
+    std::getline(stream, l);
+    std::istringstream line{ l };
+    std::string name;
+    size_t size;
+    uint16_t rights;
+    std::string owner;
+    if (!(line >> name))
+    {
+        return DirectoryInfo{};
+    }
+    if (!(line >> size))
+    {
+        return DirectoryInfo{};
+    }
+    if (!(line >> std::oct >> rights >> std::dec))
+    {
+        return DirectoryInfo{};
+    }
+    if (!(line >> owner))
+    {
+        return DirectoryInfo{};
+    }
+    if (line.eof())
+        return DirectoryInfo{ name, size, rights, owner };
+    return DirectoryInfo{};
+}
\ No newline at end of file
diff --git a/graphs/cpp/directories_infos/read_info.hh b/graphs/cpp/directories_infos/read_info.hh
new file mode 100644
index 0000000..72f64b4
--- /dev/null
+++ b/graphs/cpp/directories_infos/read_info.hh
@@ -0,0 +1,7 @@
+#pragma once
+#include <iostream>
+
+#include "directory_info.hh"
+
+// use ref to istream
+DirectoryInfo read_info(std::istream& stream);
\ No newline at end of file
diff --git a/graphs/cpp/doubly_linked_list/CMakeLists.txt b/graphs/cpp/doubly_linked_list/CMakeLists.txt
new file mode 100644
index 0000000..37204f6
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.21.2)
+project(doubly_linked_list)
+
+add_library(doubly_linked_list SHARED node.cc list.cc)
+target_compile_options(doubly_linked_list PRIVATE -Wall -Wextra -Werror -pedantic -std=c++20 -Wold-style-cast)
+set_target_properties(doubly_linked_list PROPERTIES
+        CXX_STANDARD 20
+        CXX_EXTENSIONS OFF)
\ No newline at end of file
diff --git a/graphs/cpp/doubly_linked_list/list.cc b/graphs/cpp/doubly_linked_list/list.cc
new file mode 100644
index 0000000..36cf5ad
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/list.cc
@@ -0,0 +1,88 @@
+#include "list.hh"
+List::List()
+    : nb_elts_{ 0 }
+{}
+void List::push_front(int i)
+{
+    nb_elts_++;
+    if (nb_elts_ == 1)
+    {
+        first_ = std::make_shared<Node>(i);
+        last_ = first_;
+        return;
+    }
+    std::shared_ptr<Node> ns = std::make_shared<Node>(i);
+    ns->set_next(first_);
+    first_->set_prev(ns);
+    first_ = ns;
+}
+std::optional<int> List::pop_front()
+{
+    if (nb_elts_ == 0)
+    {
+        return std::nullopt;
+    }
+    nb_elts_--;
+    int res = first_->get_val();
+    if (nb_elts_ == 0)
+    {
+        first_ = nullptr;
+        last_ = nullptr;
+        return res;
+    }
+    std::shared_ptr<Node> tmp = first_->get_next();
+    first_->set_next(nullptr);
+    tmp->set_prev(nullptr);
+    first_ = tmp;
+    return res;
+}
+void List::push_back(int i)
+{
+    nb_elts_++;
+    if (nb_elts_ == 1)
+    {
+        first_ = std::make_shared<Node>(i);
+        last_ = first_;
+        return;
+    }
+    std::shared_ptr<Node> ns = std::make_shared<Node>(i);
+    ns->set_prev(last_);
+    last_->set_next(ns);
+    last_ = ns;
+}
+std::optional<int> List::pop_back()
+{
+    if (nb_elts_ == 0)
+    {
+        return std::nullopt;
+    }
+    nb_elts_--;
+    int res = last_->get_val();
+    if (nb_elts_ == 0)
+    {
+        first_ = nullptr;
+        last_ = nullptr;
+        return res;
+    }
+    std::shared_ptr<Node> tmp = last_->get_prev();
+    last_->set_prev(nullptr);
+    tmp->set_next(nullptr);
+    last_ = tmp;
+    return res;
+}
+void List::print(std::ostream& os) const
+{
+    if (nb_elts_ == 0)
+        return;
+    os << first_->get_val();
+    for (Node* node = first_->get_next().get(); node;
+         node = node->get_next().get())
+    {
+        os << " " << node->get_val();
+    }
+    // os << "\n";
+}
+size_t List::length() const
+{
+    return nb_elts_;
+}
\ No newline at end of file
diff --git a/graphs/cpp/doubly_linked_list/list.hh b/graphs/cpp/doubly_linked_list/list.hh
new file mode 100644
index 0000000..50f71c6
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/list.hh
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <optional>
+#include <ostream>
+
+#include "node.hh"
+
+class List
+{
+public:
+    List();
+
+    void push_front(int i);
+    void push_back(int i);
+    std::optional<int> pop_front();
+    std::optional<int> pop_back();
+    void print(std::ostream& os) const;
+    size_t length() const;
+
+private:
+    size_t nb_elts_;
+    std::shared_ptr<Node> first_;
+    std::shared_ptr<Node> last_;
+};
diff --git a/graphs/cpp/doubly_linked_list/main.cc b/graphs/cpp/doubly_linked_list/main.cc
new file mode 100644
index 0000000..cd9ab32
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/main.cc
@@ -0,0 +1,36 @@
+#include <iostream>
+
+#include "list.hh"
+
+int main()
+{
+    List l = List();
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.push_back(13);
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.push_front(5);
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.push_back(42);
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.pop_back();
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.push_back(42);
+    l.print(std::cout);
+    std::cout << '\n';
+
+    l.pop_front();
+    l.print(std::cout);
+    std::cout << '\n';
+
+    std::cout << "Nb elts: " << l.length() << '\n';
+}
diff --git a/graphs/cpp/doubly_linked_list/node.cc b/graphs/cpp/doubly_linked_list/node.cc
new file mode 100644
index 0000000..b6db962
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/node.cc
@@ -0,0 +1,29 @@
+#include "node.hh"
+
+Node::Node(int v)
+    : val_{ v }
+{}
+int Node::get_val() const
+{
+    return val_;
+}
+void Node::set_val(int val)
+{
+    val_ = val;
+}
+std::shared_ptr<Node> Node::get_next() const
+{
+    return next_;
+}
+void Node::set_next(std::shared_ptr<Node> next)
+{
+    next_ = next;
+}
+std::shared_ptr<Node> Node::get_prev() const
+{
+    return prev_.lock();
+}
+void Node::set_prev(std::shared_ptr<Node> prev)
+{
+    prev_ = prev;
+}
\ No newline at end of file
diff --git a/graphs/cpp/doubly_linked_list/node.hh b/graphs/cpp/doubly_linked_list/node.hh
new file mode 100644
index 0000000..9eb2e50
--- /dev/null
+++ b/graphs/cpp/doubly_linked_list/node.hh
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <memory>
+
+class Node
+{
+public:
+    Node(int v);
+
+    int get_val() const;
+    void set_val(int val);
+
+    std::shared_ptr<Node> get_next() const;
+    void set_next(std::shared_ptr<Node> next);
+
+    std::shared_ptr<Node> get_prev() const;
+    void set_prev(std::shared_ptr<Node> prev);
+
+private:
+    int val_;
+    std::shared_ptr<Node> next_;
+    std::weak_ptr<Node> prev_;
+};
diff --git a/graphs/cpp/exception/Makefile b/graphs/cpp/exception/Makefile
new file mode 100644
index 0000000..01107c5
--- /dev/null
+++ b/graphs/cpp/exception/Makefile
@@ -0,0 +1,14 @@
+CC=g++
+CXXFLAGS= -Wall -Wextra -Werror -std=c++20 -pedantic -Wold-style-cast
+
+OBJS= main.o game.o player.o invalid_argument.o
+BIN= main
+
+all: ${BIN}
+
+${BIN}: ${OBJS}
+
+clean:
+	${RM} ${OBJS} ${BIN}
+
+.PHONY: clean all
diff --git a/graphs/cpp/exception/game.cc b/graphs/cpp/exception/game.cc
new file mode 100644
index 0000000..88d435c
--- /dev/null
+++ b/graphs/cpp/exception/game.cc
@@ -0,0 +1,23 @@
+#include "game.hh"
+
+#include <iostream>
+
+Game::Game(int secret)
+    : secret_(secret)
+{}
+
+void Game::play(const Player& p1, const Player& p2) const
+{
+    if (p1 == p2)
+        throw InvalidArgumentException{ "Stop playing by yourself!" };
+
+    auto d1 = std::abs(p1.get_guess() - secret_);
+    auto d2 = std::abs(p2.get_guess() - secret_);
+
+    if (d1 > d2)
+        std::cout << p1 << " wins!" << std::endl;
+    else if (d1 < d2)
+        std::cout << p2 << " wins!" << std::endl;
+    else
+        std::cout << "Draw!" << std::endl;
+}
diff --git a/graphs/cpp/exception/game.hh b/graphs/cpp/exception/game.hh
new file mode 100644
index 0000000..e162bda
--- /dev/null
+++ b/graphs/cpp/exception/game.hh
@@ -0,0 +1,14 @@
+#pragma once
+
+#include "invalid_argument.hh"
+#include "player.hh"
+
+class Game
+{
+public:
+    Game(int secret);
+    void play(const Player& p1, const Player& p2) const;
+
+private:
+    int secret_;
+};
diff --git a/graphs/cpp/exception/invalid_argument.cc b/graphs/cpp/exception/invalid_argument.cc
new file mode 100644
index 0000000..aafa4e3
--- /dev/null
+++ b/graphs/cpp/exception/invalid_argument.cc
@@ -0,0 +1,9 @@
+#include "invalid_argument.hh"
+
+InvalidArgumentException::InvalidArgumentException(const std::string& msg)
+    : msg_{ msg }
+{}
+const char* InvalidArgumentException::what() const noexcept
+{
+    return msg_.c_str();
+}
\ No newline at end of file
diff --git a/graphs/cpp/exception/invalid_argument.hh b/graphs/cpp/exception/invalid_argument.hh
new file mode 100644
index 0000000..25356df
--- /dev/null
+++ b/graphs/cpp/exception/invalid_argument.hh
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <exception>
+#include <string>
+
+class InvalidArgumentException : public std::exception
+{
+public:
+    InvalidArgumentException(const std::string& msg);
+
+    virtual const char* what() const noexcept;
+
+private:
+    std::string msg_;
+};
diff --git a/graphs/cpp/exception/main.cc b/graphs/cpp/exception/main.cc
new file mode 100644
index 0000000..7881a4c
--- /dev/null
+++ b/graphs/cpp/exception/main.cc
@@ -0,0 +1,80 @@
+#include <iostream>
+
+#include "game.hh"
+#include "invalid_argument.hh"
+#include "player.hh"
+
+int main()
+{
+    Game g(42);
+    std::string n1 = "Toto";
+    std::string n2 = "Frodo";
+    std::string n3 = "Feanor";
+    std::string n4 = "Pikachu";
+    std::string n5 = "Baby";
+    std::string n6 = "";
+
+    try
+    {
+        Player p1 = Player(n1, 9, 3);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+    try
+    {
+        Player p2 = Player(n2, 51, 5);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+    try
+    {
+        Player p3 = Player(n3, 3142, 42);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+    try
+    {
+        Player p4 = Player(n4, 25, 5000);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+    try
+    {
+        Player p5 = Player(n5, -1, 1);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+    try
+    {
+        Player p6 = Player(n6, 19, 1);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+
+    try
+    {
+        Player p1 = Player(n1, 9, 3);
+        Player p2 = Player(n2, 51, -18);
+        g.play(p1, p1);
+    }
+    catch (InvalidArgumentException& e)
+    {
+        std::cout << e.what() << std::endl;
+    }
+
+    Player p1 = Player(n1, 9, 3);
+    Player p2 = Player(n2, 51, -18);
+    g.play(p1, p2);
+}
diff --git a/graphs/cpp/exception/player.cc b/graphs/cpp/exception/player.cc
new file mode 100644
index 0000000..4a0b378
--- /dev/null
+++ b/graphs/cpp/exception/player.cc
@@ -0,0 +1,34 @@
+#include "player.hh"
+
+Player::Player(const std::string& name, int age, int guess)
+    : name_(name)
+    , age_(age)
+    , guess_(guess)
+{
+    if (name.empty())
+        throw InvalidArgumentException{ "Name can't be empty." };
+    if (age < 0)
+        throw InvalidArgumentException{
+            "Well, it seems you are not born yet."
+        };
+    if (age > 150)
+        throw InvalidArgumentException{ "Sorry gramp, too old to play." };
+}
+
+int Player::get_guess() const
+{
+    return guess_;
+}
+bool Player::operator==(const Player& p) const
+{
+    return this == &p;
+}
+bool Player::operator!=(const Player& p) const
+{
+    return this != &p;
+}
+
+std::ostream& operator<<(std::ostream& os, const Player& p)
+{
+    return os << p.name_ << '(' << p.age_ << ')';
+}
diff --git a/graphs/cpp/exception/player.hh b/graphs/cpp/exception/player.hh
new file mode 100644
index 0000000..3ee8060
--- /dev/null
+++ b/graphs/cpp/exception/player.hh
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <iostream>
+
+#include "invalid_argument.hh"
+
+class Player
+{
+public:
+    Player(const std::string& name, int age, int guess);
+
+    int get_guess() const;
+
+    friend std::ostream& operator<<(std::ostream& os, const Player& b);
+
+    bool operator==(const Player& p) const;
+    bool operator!=(const Player& p) const;
+
+private:
+    std::string name_;
+    int age_;
+
+    int guess_;
+};
+
+std::ostream& operator<<(std::ostream& os, const Player& p);
diff --git a/graphs/cpp/exist_functor/example.cc b/graphs/cpp/exist_functor/example.cc
new file mode 100644
index 0000000..d580f7b
--- /dev/null
+++ b/graphs/cpp/exist_functor/example.cc
@@ -0,0 +1,24 @@
+#include <iostream>
+
+#include "exist.hh"
+
+int main()
+{
+    Exist<int> exist_int;
+    Exist<std::string> exist_str;
+
+    // Test with integers
+    std::cout << std::boolalpha;
+    std::cout << exist_int(1) << std::endl; // Prints false
+    std::cout << exist_int(2) << std::endl; // Prints false
+    std::cout << exist_int(1) << std::endl; // Prints true
+    std::cout << exist_int(3) << std::endl; // Prints false
+
+    // Test with strings
+    std::cout << exist_str(std::string("Hello")) << std::endl; // Prints false
+    std::cout << exist_str(std::string("World")) << std::endl; // Prints false
+    std::cout << exist_str(std::string("Hello")) << std::endl; // Prints true
+    std::cout << exist_str(std::string("C++")) << std::endl; // Prints false
+
+    return 0;
+}
diff --git a/graphs/cpp/exist_functor/exist.hh b/graphs/cpp/exist_functor/exist.hh
new file mode 100644
index 0000000..49cafd6
--- /dev/null
+++ b/graphs/cpp/exist_functor/exist.hh
@@ -0,0 +1,14 @@
+#pragma once
+#include <vector>
+
+template <class T>
+class Exist
+{
+public:
+    bool operator()(T x);
+
+private:
+    std::vector<T> seen_;
+};
+
+#include "exist.hxx"
diff --git a/graphs/cpp/exist_functor/exist.hxx b/graphs/cpp/exist_functor/exist.hxx
new file mode 100644
index 0000000..638c4e3
--- /dev/null
+++ b/graphs/cpp/exist_functor/exist.hxx
@@ -0,0 +1,15 @@
+#pragma once
+#include <algorithm>
+
+#include "exist.hh"
+
+template <class T>
+bool Exist<T>::operator()(T x)
+{
+    if (std::find(seen_.begin(), seen_.end(), x) == seen_.end())
+    {
+        seen_.push_back(x);
+        return false;
+    }
+    return true;
+}
\ No newline at end of file
diff --git a/graphs/cpp/for_each/for_each.hh b/graphs/cpp/for_each/for_each.hh
new file mode 100644
index 0000000..195c3c6
--- /dev/null
+++ b/graphs/cpp/for_each/for_each.hh
@@ -0,0 +1,6 @@
+#pragma once
+
+template <class IT, class F>
+void my_foreach(IT begin, IT end, auto fun);
+
+#include "for_each.hxx"
\ No newline at end of file
diff --git a/graphs/cpp/for_each/for_each.hxx b/graphs/cpp/for_each/for_each.hxx
new file mode 100644
index 0000000..dcfa0fa
--- /dev/null
+++ b/graphs/cpp/for_each/for_each.hxx
@@ -0,0 +1,9 @@
+#pragma once
+#include "for_each.hh"
+
+template <class IT, class F>
+void my_foreach(IT begin, IT end, F fun)
+{
+    for (; begin != end; ++begin)
+        fun(*begin);
+}
\ No newline at end of file
diff --git a/graphs/cpp/for_each/main.cc b/graphs/cpp/for_each/main.cc
new file mode 100644
index 0000000..08da792
--- /dev/null
+++ b/graphs/cpp/for_each/main.cc
@@ -0,0 +1,10 @@
+#include <iostream>
+
+#include "for_each.hh"
+
+int main()
+{
+    auto v = { 'M', 'y', 'S', 'T', 'L', '\n' };
+
+    my_foreach(v.begin(), v.end(), [](auto c) { std::cout << c; });
+}
diff --git a/graphs/cpp/forward_multiplication/forward_multiplication.cc b/graphs/cpp/forward_multiplication/forward_multiplication.cc
new file mode 100644
index 0000000..72abc91
--- /dev/null
+++ b/graphs/cpp/forward_multiplication/forward_multiplication.cc
@@ -0,0 +1,7 @@
+#include "forward_multiplication.hh"
+//
+// Created by martial.simon on 2/26/25.
+//
+outer_lambda_type mult_by = [](int val) {
+    return [val](int mul) { return val * mul; };
+};
\ No newline at end of file
diff --git a/graphs/cpp/forward_multiplication/forward_multiplication.hh b/graphs/cpp/forward_multiplication/forward_multiplication.hh
new file mode 100644
index 0000000..9cca5e6
--- /dev/null
+++ b/graphs/cpp/forward_multiplication/forward_multiplication.hh
@@ -0,0 +1,7 @@
+#pragma once
+
+#include <functional>
+
+using inner_lambda_type = const std::function<int(int rhs)>;
+using outer_lambda_type = const std::function<inner_lambda_type(int lhs)>;
+extern outer_lambda_type mult_by;
diff --git a/graphs/cpp/forward_multiplication/forward_multiplication_test.cc b/graphs/cpp/forward_multiplication/forward_multiplication_test.cc
new file mode 100644
index 0000000..21be1a6
--- /dev/null
+++ b/graphs/cpp/forward_multiplication/forward_multiplication_test.cc
@@ -0,0 +1,21 @@
+#include <iostream>
+#include <string>
+
+#include "forward_multiplication.hh"
+
+int main(int argc, char** argv)
+{
+    if (argc != 3)
+    {
+        std::cerr << "Usage: " << argv[0] << " 'number' 'number'" << std::endl;
+        return 1;
+    }
+
+    auto lhs = std::stoi(argv[1]);
+    auto rhs = std::stoi(argv[2]);
+
+    auto mult_by_lhs = mult_by(lhs);
+
+    std::cout << mult_by(lhs)(rhs) << '\n';
+    std::cout << mult_by_lhs(rhs) << std::endl;
+}
diff --git a/graphs/cpp/hello_world/hello_world.cc b/graphs/cpp/hello_world/hello_world.cc
new file mode 100644
index 0000000..f3ac0cf
--- /dev/null
+++ b/graphs/cpp/hello_world/hello_world.cc
@@ -0,0 +1,6 @@
+#include <iostream>
+int main()
+{
+    std::cout << "Hello World!\n";
+    return 0;
+}
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/bomb.cc b/graphs/cpp/hot_potato/bomb.cc
new file mode 100644
index 0000000..256e3d7
--- /dev/null
+++ b/graphs/cpp/hot_potato/bomb.cc
@@ -0,0 +1,28 @@
+#include "bomb.hh"
+
+#include <iostream>
+#include <stdexcept>
+
+Bomb::Bomb(int ticks)
+{
+    if (ticks <= 0)
+        throw std::runtime_error{
+            "Number of ticks should be strictly positive"
+        };
+    max_ticks_ = ticks;
+    count_ = 0;
+}
+void Bomb::tick()
+{
+    if (count_ >= max_ticks_)
+        throw std::runtime_error{ "Bomb should have already exploded." };
+    if (count_ % 2)
+        std::cout << "Tac!\n";
+    else
+        std::cout << "Tic!\n";
+    count_++;
+}
+bool Bomb::has_exploded() const
+{
+    return count_ >= max_ticks_;
+}
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/bomb.hh b/graphs/cpp/hot_potato/bomb.hh
new file mode 100644
index 0000000..41e0bd3
--- /dev/null
+++ b/graphs/cpp/hot_potato/bomb.hh
@@ -0,0 +1,11 @@
+#pragma once
+
+class Bomb {
+public:
+    Bomb(int ticks);
+    void tick();
+    bool has_exploded() const;
+private:
+    int max_ticks_;
+    int count_;
+};
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/game.cc b/graphs/cpp/hot_potato/game.cc
new file mode 100644
index 0000000..3e0889a
--- /dev/null
+++ b/graphs/cpp/hot_potato/game.cc
@@ -0,0 +1,48 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#include "game.hh"
+
+#include <iostream>
+#include <stdexcept>
+void Game::add_player(const std::string& name, size_t nb_presses)
+{
+    auto new_player = std::make_unique<Player>(name, nb_presses);
+    if (head_ == nullptr)
+    {
+        head_ = std::move(new_player);
+        tail_ = head_.get();
+    }
+    else
+    {
+        tail_->set_next(std::move(new_player));
+        tail_ = tail_->get_next();
+    }
+}
+void Game::play(int bomb_ticks)
+{
+    if (!head_ || !head_->get_next())
+        throw std::runtime_error{ "Not enough players." };
+    head_->set_bomb(std::make_unique<Bomb>(bomb_ticks));
+    Player* p = head_.get();
+    while (true)
+    {
+        p->press_bomb();
+        if (p->is_dead())
+        {
+            std::cout << p->get_name() << " has exploded.\n";
+            return;
+        }
+        if (p == tail_)
+        {
+            p->pass_bomb(*head_);
+            p = head_.get();
+        }
+        else
+        {
+            p->pass_bomb(*p->get_next());
+            p = p->get_next();
+        }
+    }
+}
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/game.hh b/graphs/cpp/hot_potato/game.hh
new file mode 100644
index 0000000..fd65b28
--- /dev/null
+++ b/graphs/cpp/hot_potato/game.hh
@@ -0,0 +1,17 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#pragma once
+#include <memory>
+
+#include "player.hh"
+
+class Game {
+public:
+    void add_player(const std::string& name, size_t nb_presses);
+    void play(int bomb_ticks);
+private:
+    std::unique_ptr<Player> head_;
+    Player* tail_ = nullptr;
+};
diff --git a/graphs/cpp/hot_potato/main.cc b/graphs/cpp/hot_potato/main.cc
new file mode 100644
index 0000000..ce491d0
--- /dev/null
+++ b/graphs/cpp/hot_potato/main.cc
@@ -0,0 +1,20 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+#include "game.hh"
+int main()
+{
+    auto game = Game();
+    game.add_player("Benjamin", 2);
+    game.add_player("Andy", 1);
+    game.add_player("Geoffrey", 3);
+    game.add_player("Hugo", 1);
+    game.add_player("Maayane", 2);
+    game.add_player("Quentin", 1);
+    game.add_player("Lucas", 5); // Likes risks
+    game.add_player("Tom", 1);
+    game.add_player("Alexis", 0); // Cheater
+    game.add_player("FX", 3);
+    game.add_player("Lois", 2);
+    game.play(12);
+}
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/player.cc b/graphs/cpp/hot_potato/player.cc
new file mode 100644
index 0000000..3ab0f28
--- /dev/null
+++ b/graphs/cpp/hot_potato/player.cc
@@ -0,0 +1,63 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#include "player.hh"
+
+#include <iostream>
+Player::Player(const std::string& name, size_t nb_presses)
+    : name_{ name }
+    , bomb_{ nullptr }
+    , nb_presses_{ nb_presses }
+    , next_{ nullptr }
+{}
+Player* Player::get_next() const
+{
+    return next_.get();
+}
+void Player::set_next(std::unique_ptr<Player> next)
+{
+    next_ = std::move(next);
+}
+void Player::pass_bomb(Player& receiver)
+{
+    if (!this->has_bomb() || receiver.has_bomb())
+        throw std::runtime_error{
+            "Passer doesn't have the bomb or receiver already has it."
+        };
+    std::cout << this->get_name() << " passes the bomb to "
+              << receiver.get_name() << ".\n";
+    receiver.set_bomb(std::move(this->bomb_));
+    this->bomb_ = nullptr;
+}
+void Player::press_bomb()
+{
+    if (bomb_ == nullptr)
+        throw std::runtime_error{
+            "Can't press bomb if player doesn't have it."
+        };
+    if (bomb_->has_exploded())
+        return;
+    for (size_t i = 0; i < nb_presses_ && !bomb_->has_exploded(); ++i)
+    {
+        bomb_->tick();
+    }
+}
+void Player::set_bomb(std::unique_ptr<Bomb> bomb)
+{
+    this->bomb_ = std::move(bomb);
+}
+const std::string& Player::get_name() const
+{
+    return name_;
+}
+bool Player::has_bomb() const
+{
+    return bomb_ != nullptr;
+}
+bool Player::is_dead() const
+{
+    if (has_bomb())
+        return bomb_->has_exploded();
+    return false;
+}
\ No newline at end of file
diff --git a/graphs/cpp/hot_potato/player.hh b/graphs/cpp/hot_potato/player.hh
new file mode 100644
index 0000000..0439305
--- /dev/null
+++ b/graphs/cpp/hot_potato/player.hh
@@ -0,0 +1,25 @@
+#pragma once
+#include <memory>
+#include <string>
+
+#include "bomb.hh"
+
+class Player
+{
+public:
+    Player(const std::string& name, size_t nb_presses);
+    Player* get_next() const;
+    void set_next(std::unique_ptr<Player> next);
+    void pass_bomb(Player& receiver);
+    void press_bomb();
+    void set_bomb(std::unique_ptr<Bomb> bomb);
+    const std::string& get_name() const;
+    bool has_bomb() const;
+    bool is_dead() const;
+
+private:
+    std::string name_;
+    std::unique_ptr<Bomb> bomb_;
+    size_t nb_presses_;
+    std::unique_ptr<Player> next_;
+};
\ No newline at end of file
diff --git a/graphs/cpp/implements/implements.hh b/graphs/cpp/implements/implements.hh
new file mode 100644
index 0000000..bd80d8e
--- /dev/null
+++ b/graphs/cpp/implements/implements.hh
@@ -0,0 +1,47 @@
+#pragma once
+
+template <typename T, typename T2 = T>
+concept impl_basic_op = requires(T a, T2 b) {
+    +a;
+    -a;
+
+    -b;
+    +b;
+
+    a + b;
+    a - b;
+    a* b;
+    a / b;
+
+    b + a;
+    b - a;
+    b* a;
+    b / a;
+};
+
+template <typename T, typename T2 = T>
+concept impl_modulo = requires(T a, T2 b) {
+    a % b;
+    b % a;
+};
+
+template <typename T, typename T2 = T>
+concept impl_bitwise_op = requires(T a, T2 b) {
+    ~a;
+    ~b;
+    a & b;
+    a | b;
+    a ^ b;
+    a << b;
+    a >> b;
+
+    b & a;
+    b | a;
+    b ^ a;
+    b << a;
+    b >> a;
+};
+
+template <typename T, typename T2 = T>
+concept impl_arith_op =
+    impl_basic_op<T, T2> && impl_modulo<T, T2> && impl_bitwise_op<T, T2>;
\ No newline at end of file
diff --git a/graphs/cpp/int_container/int_container.cc b/graphs/cpp/int_container/int_container.cc
new file mode 100644
index 0000000..aabb5ab
--- /dev/null
+++ b/graphs/cpp/int_container/int_container.cc
@@ -0,0 +1,83 @@
+#include "int_container.hh"
+MyIntContainer::MyIntContainer(size_t size)
+    : current_size_{ 0 }
+    , max_size_{ size }
+    , elems_{ std::make_unique<int[]>(size) }
+{}
+void MyIntContainer::print() const
+{
+    if (current_size_ == 0)
+        return;
+    std::cout << elems_[0];
+    for (size_t i = 1; i < current_size_; ++i)
+    {
+        std::cout << " | " << elems_[i];
+    }
+    std::cout << "\n";
+}
+size_t MyIntContainer::get_len() const
+{
+    return current_size_;
+}
+bool MyIntContainer::add(int elem)
+{
+    if (current_size_ == max_size_)
+        return false;
+    elems_[current_size_++] = elem;
+    return true;
+}
+std::optional<int> MyIntContainer::pop()
+{
+    if (current_size_ == 0)
+        return std::nullopt;
+    int res = elems_[--current_size_];
+    elems_[current_size_] = -1;
+    return res;
+}
+std::optional<int> MyIntContainer::get(size_t position) const
+{
+    if (position >= current_size_)
+        return std::nullopt;
+    return elems_[position];
+}
+std::optional<size_t> MyIntContainer::find(int elem) const
+{
+    size_t i;
+    for (i = 0; i < current_size_ && elems_[i] != elem; ++i)
+        continue;
+    if (i == current_size_)
+        return std::nullopt;
+    return i;
+}
+void swap(int& a, int& b)
+{
+    int tmp = a;
+    a = b;
+    b = tmp;
+}
+void MyIntContainer::sort()
+{
+    for (size_t i = 0; i < current_size_ - 1; i++)
+    {
+        bool flag = false;
+        for (size_t j = 0; j < current_size_ - i - 1; j++)
+        {
+            if (elems_[j] > elems_[j + 1])
+            {
+                swap(elems_[j], elems_[j + 1]);
+                flag = true;
+            }
+        }
+        if (!flag)
+            break;
+    }
+}
+bool MyIntContainer::is_sorted() const
+{
+    for (size_t i = 1; i < current_size_; i++)
+    {
+        if (elems_[i - 1] > elems_[i])
+            return false;
+    }
+    return true;
+}
\ No newline at end of file
diff --git a/graphs/cpp/int_container/int_container.hh b/graphs/cpp/int_container/int_container.hh
new file mode 100644
index 0000000..2df772a
--- /dev/null
+++ b/graphs/cpp/int_container/int_container.hh
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <iostream>
+#include <memory>
+#include <optional>
+
+class MyIntContainer
+{
+public:
+    MyIntContainer(size_t size);
+
+    // Print the content of the container
+    void print() const;
+
+    // Get the current number of elements inside the array
+    size_t get_len() const;
+
+    // Add an element inside the array
+    bool add(int elem);
+
+    // Get the last element inside the array and remove it
+    std::optional<int> pop();
+
+    // Get the element at a given position
+    std::optional<int> get(size_t position) const;
+
+    // Get the index inside the array of a given element
+    std::optional<size_t> find(int elem) const;
+
+    // Sort the array
+    void sort();
+
+    // Checks if the array is sorted
+    bool is_sorted() const;
+
+private:
+    // Current size of the elems_ array
+    size_t current_size_;
+
+    // Maximum size of the elems_ array
+    size_t max_size_;
+
+    // Array containing the elements
+    std::unique_ptr<int[]> elems_;
+};
diff --git a/graphs/cpp/is_prime/is_prime.hh b/graphs/cpp/is_prime/is_prime.hh
new file mode 100644
index 0000000..ae83249
--- /dev/null
+++ b/graphs/cpp/is_prime/is_prime.hh
@@ -0,0 +1,5 @@
+#pragma once
+
+constexpr bool is_prime(unsigned n);
+
+#include "is_prime.hxx"
\ No newline at end of file
diff --git a/graphs/cpp/is_prime/is_prime.hxx b/graphs/cpp/is_prime/is_prime.hxx
new file mode 100644
index 0000000..da2b94d
--- /dev/null
+++ b/graphs/cpp/is_prime/is_prime.hxx
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "is_prime.hh"
+constexpr bool is_prime(unsigned n)
+{
+    if (n == 0 || n == 1)
+    {
+        return false;
+    }
+    else
+    {
+        for (unsigned i = 2; i <= n / 2; ++i)
+        {
+            if (n % i == 0)
+            {
+                return false;
+            }
+        }
+    }
+    return true;
+}
\ No newline at end of file
diff --git a/graphs/cpp/logger/CMakeLists.txt b/graphs/cpp/logger/CMakeLists.txt
new file mode 100644
index 0000000..3a705e9
--- /dev/null
+++ b/graphs/cpp/logger/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.21.2)
+project(logger)
+
+add_compile_options(-Wall -Wextra -Werror -pedantic -std=c++20 -Wold-style-cast)
+
+add_library(logger_a SHARED logger.cc)
+add_executable(logger main.cc)
+target_link_libraries(logger PUBLIC logger_a)
\ No newline at end of file
diff --git a/graphs/cpp/logger/logger.cc b/graphs/cpp/logger/logger.cc
new file mode 100644
index 0000000..fa2fed1
--- /dev/null
+++ b/graphs/cpp/logger/logger.cc
@@ -0,0 +1,73 @@
+#include "logger.hh"
+
+#include <iostream>
+#include <string>
+
+void LogMe::Logger::set_debug_level(logging_level level)
+{
+    level_ = level;
+}
+void LogMe::Logger::log(logging_level level, const std::string& msg)
+{
+    if (level_ >= level)
+    {
+        switch (level)
+        {
+        case DEBUG:
+            debug(msg);
+            break;
+        case INFO:
+            info(msg);
+            break;
+        case WARN:
+            warn(msg);
+            break;
+        case CRITICAL:
+            critical(msg);
+            break;
+        case ERROR:
+            error(msg);
+            break;
+        }
+    }
+}
+
+void LogMe::Logger::debug(const std::string& msg)
+{
+    if (!output_stream_.is_open())
+        std::cerr << "[DEBUG] - " << msg << "\n";
+    else
+        output_stream_ << "[DEBUG] - " << msg << "\n";
+}
+
+void LogMe::Logger::info(const std::string& msg)
+{
+    if (!output_stream_.is_open())
+        std::cerr << "[INFO] - " << msg << "\n";
+    else
+        output_stream_ << "[INFO] - " << msg << "\n";
+}
+
+void LogMe::Logger::warn(const std::string& msg)
+{
+    if (!output_stream_.is_open())
+        std::cerr << "[WARN] - " << msg << "\n";
+    else
+        output_stream_ << "[WARN] - " << msg << "\n";
+}
+
+void LogMe::Logger::error(const std::string& msg)
+{
+    if (!output_stream_.is_open())
+        std::cerr << "[ERROR] - " << msg << "\n";
+    else
+        output_stream_ << "[ERROR] - " << msg << "\n";
+}
+
+void LogMe::Logger::critical(const std::string& msg)
+{
+    if (!output_stream_.is_open())
+        std::cerr << "[CRITICAL] - " << msg << "\n";
+    else
+        output_stream_ << "[CRITICAL] - " << msg << "\n";
+}
\ No newline at end of file
diff --git a/graphs/cpp/logger/logger.hh b/graphs/cpp/logger/logger.hh
new file mode 100644
index 0000000..4b3a43b
--- /dev/null
+++ b/graphs/cpp/logger/logger.hh
@@ -0,0 +1,47 @@
+#pragma once
+#include <fstream>
+#include <string>
+
+namespace LogMe
+{
+    enum logging_level
+    {
+        DEBUG,
+        INFO,
+        WARN,
+        ERROR,
+        CRITICAL
+    };
+    class Logger
+    {
+    public:
+        Logger(logging_level level, const std::string& log_file)
+            : level_{ level }
+        {
+            output_stream_.open(log_file);
+        }
+        Logger(logging_level level)
+            : level_{ level }
+        {}
+
+        ~Logger()
+        {
+            if (output_stream_.is_open())
+            {
+                output_stream_.close();
+            }
+        }
+
+        void set_debug_level(logging_level level);
+        void log(logging_level level, const std::string& msg);
+        void debug(const std::string& msg);
+        void info(const std::string& msg);
+        void warn(const std::string& msg);
+        void critical(const std::string& msg);
+        void error(const std::string& msg);
+
+    private:
+        logging_level level_;
+        std::ofstream output_stream_;
+    };
+} // namespace LogMe
diff --git a/graphs/cpp/logger/main.cc b/graphs/cpp/logger/main.cc
new file mode 100644
index 0000000..483ffdd
--- /dev/null
+++ b/graphs/cpp/logger/main.cc
@@ -0,0 +1,13 @@
+#include <iostream>
+
+#include "logger.hh"
+
+int main()
+{
+    LogMe::Logger logger{ LogMe::INFO };
+    logger.log(LogMe::INFO, "Program starting.");
+    std::cout << "Hello, World!" << std::endl;
+    logger.log(LogMe::ERROR, "Error log.");
+    logger.log(LogMe::DEBUG, "Program end.");
+    return 0;
+}
\ No newline at end of file
diff --git a/graphs/cpp/lookup_table/fibo.cc b/graphs/cpp/lookup_table/fibo.cc
new file mode 100644
index 0000000..80b72b1
--- /dev/null
+++ b/graphs/cpp/lookup_table/fibo.cc
@@ -0,0 +1,15 @@
+#include "fibo.hh"
+
+long Fibo::operator()(int x)
+{
+    if (x <= 1)
+        return x;
+
+    std::optional<long> opt_lookup_table = lookup_table_.get(x);
+    if (opt_lookup_table)
+        return *opt_lookup_table;
+
+    auto res = (*this)(x - 1) + (*this)(x - 2);
+    lookup_table_.set(x, res);
+    return res;
+}
diff --git a/graphs/cpp/lookup_table/fibo.hh b/graphs/cpp/lookup_table/fibo.hh
new file mode 100644
index 0000000..8f30851
--- /dev/null
+++ b/graphs/cpp/lookup_table/fibo.hh
@@ -0,0 +1,12 @@
+#pragma once
+
+#include "lookup_table.hh"
+
+class Fibo
+{
+private:
+    LookupTable lookup_table_;
+
+public:
+    long operator()(int x);
+};
diff --git a/graphs/cpp/lookup_table/lookup_table.cc b/graphs/cpp/lookup_table/lookup_table.cc
new file mode 100644
index 0000000..0440e61
--- /dev/null
+++ b/graphs/cpp/lookup_table/lookup_table.cc
@@ -0,0 +1,14 @@
+//
+// Created by martial.simon on 2/26/25.
+//
+#include "lookup_table.hh"
+std::optional<long> LookupTable::get(int x)
+{
+    if (table_.count(x) == 0)
+        return std::nullopt;
+    return table_.at(x);
+}
+void LookupTable::set(int x, long value)
+{
+    table_.insert_or_assign(x, value);
+}
\ No newline at end of file
diff --git a/graphs/cpp/lookup_table/lookup_table.hh b/graphs/cpp/lookup_table/lookup_table.hh
new file mode 100644
index 0000000..eb25d43
--- /dev/null
+++ b/graphs/cpp/lookup_table/lookup_table.hh
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <optional>
+#include <unordered_map>
+
+class LookupTable
+{
+public:
+    std::optional<long> get(int x);
+    void set(int x, long value);
+
+private:
+    std::unordered_map<int, long> table_;
+};
diff --git a/graphs/cpp/lookup_table/lookup_table_test.cc b/graphs/cpp/lookup_table/lookup_table_test.cc
new file mode 100644
index 0000000..a17101e
--- /dev/null
+++ b/graphs/cpp/lookup_table/lookup_table_test.cc
@@ -0,0 +1,9 @@
+#include <iostream>
+
+#include "fibo.hh"
+
+int main()
+{
+    Fibo fibo;
+    std::cout << fibo(42) << '\n';
+}
diff --git a/graphs/cpp/merge_sort/merge_sort.cc b/graphs/cpp/merge_sort/merge_sort.cc
new file mode 100644
index 0000000..ed7afdf
--- /dev/null
+++ b/graphs/cpp/merge_sort/merge_sort.cc
@@ -0,0 +1,12 @@
+#include "merge_sort.hh"
+void merge_sort(iterator_type begin, iterator_type end)
+{
+    if (const auto diff = distance(begin, end); diff > 1)
+    {
+        const auto m = begin + diff / 2;
+
+        merge_sort(begin, m);
+        merge_sort(m, end);
+        return std::inplace_merge(begin, m, end);
+    }
+}
\ No newline at end of file
diff --git a/graphs/cpp/merge_sort/merge_sort.hh b/graphs/cpp/merge_sort/merge_sort.hh
new file mode 100644
index 0000000..7e7f02f
--- /dev/null
+++ b/graphs/cpp/merge_sort/merge_sort.hh
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <algorithm>
+#include <vector>
+
+#define while forbidden_use_of_while
+#define for forbidden_use_of_for
+#define goto forbidden_use_of_goto
+#define sort forbidden_use_of_sort
+#define partial_sort forbidden_use_of_sort
+#define stable_sort forbidden_use_of_sort
+#define sort_heap forbidden_use_of_sort
+
+using iterator_type = std::vector<int>::iterator;
+
+void merge_sort(iterator_type begin, iterator_type end);
diff --git a/graphs/cpp/my_nfts/auction.cc b/graphs/cpp/my_nfts/auction.cc
new file mode 100644
index 0000000..534c61d
--- /dev/null
+++ b/graphs/cpp/my_nfts/auction.cc
@@ -0,0 +1,45 @@
+#include "auction.hh"
+
+#include <algorithm>
+Auction::Auction(Person& organizer, NFT nft, uint initial_bid)
+    : organizer_{ organizer }
+    , nft_{ std::move(nft) }
+    , highest_bidder_{ nullptr }
+    , highest_bid_{ initial_bid }
+{
+    if (!nft_ || nft_->empty())
+        throw std::invalid_argument{ "Invalid nft!" };
+}
+Auction::~Auction()
+{
+    if (highest_bidder_ == nullptr)
+        organizer_.add_nft(std::move(nft_));
+    else
+    {
+        highest_bidder_->add_nft(std::move(nft_));
+        organizer_.add_money(highest_bid_);
+    }
+}
+bool Auction::bid(Person& person, uint money)
+{
+    if (money > highest_bid_)
+    {
+        if (highest_bidder_ == nullptr)
+            highest_bidder_ = &person;
+        else
+            highest_bidder_->add_money(highest_bid_);
+        highest_bid_ = money;
+        highest_bidder_ = &person;
+        highest_bidder_->remove_money(money);
+        return true;
+    }
+    return false;
+}
+const std::string& Auction::get_nft_name() const
+{
+    return *nft_;
+}
+uint Auction::get_highest_bid() const
+{
+    return highest_bid_;
+}
\ No newline at end of file
diff --git a/graphs/cpp/my_nfts/auction.hh b/graphs/cpp/my_nfts/auction.hh
new file mode 100644
index 0000000..9a1d162
--- /dev/null
+++ b/graphs/cpp/my_nfts/auction.hh
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "nft.hh"
+#include "person.hh"
+
+// Smart contract to auction a NFT.
+// It is a RAII class.
+class Auction
+{
+public:
+    // Start the auction with the given (non-null) NFT.
+    Auction(Person& organizer, NFT nft, uint initial_bid);
+    // Close the auction.
+    ~Auction();
+
+    // https://en.cppreference.com/w/cpp/language/rule_of_three#Rule_of_five
+    Auction(const Auction&&) = delete;
+    Auction(const Auction&) = delete;
+    Auction& operator=(const Auction&&) = delete;
+    Auction& operator=(const Auction&) = delete;
+
+    // Allow a person to bid at the auction.
+    bool bid(Person& person, uint money);
+
+    // Getters for the nft name and highest bid.
+    const std::string& get_nft_name() const;
+    uint get_highest_bid() const;
+
+private:
+    Person& organizer_;
+    NFT nft_;
+    Person* highest_bidder_;
+    uint highest_bid_;
+};
diff --git a/graphs/cpp/my_nfts/main.cc b/graphs/cpp/my_nfts/main.cc
new file mode 100644
index 0000000..2e9f462
--- /dev/null
+++ b/graphs/cpp/my_nfts/main.cc
@@ -0,0 +1,37 @@
+#include <iostream>
+
+#include "auction.hh"
+#include "person.hh"
+
+int main(void)
+{
+    auto p1 = Person("JP", 100);
+    auto p2 = Person("Claude", 50);
+
+    p1.add_nft(create_nft("Singe"));
+
+    std::cout << p1;
+    std::cout << p2;
+
+    p2.add_nft(p1.remove_nft("Singe"));
+
+    std::cout << p1;
+    std::cout << p2;
+
+    auto p3 = Person("Marie", 20);
+    std::cout << p1;
+    std::cout << p2;
+    std::cout << p3;
+
+    {
+        Auction auction(p2, p2.remove_nft("Singe"), 10);
+        std::cout << p1;
+        std::cout << p2;
+        std::cout << p3;
+
+        auction.bid(p1, 20);
+    }
+    std::cout << p1;
+    std::cout << p2;
+    std::cout << p3;
+}
diff --git a/graphs/cpp/my_nfts/nft.hh b/graphs/cpp/my_nfts/nft.hh
new file mode 100644
index 0000000..2147545
--- /dev/null
+++ b/graphs/cpp/my_nfts/nft.hh
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+// NFT declaration
+using NFT = std::unique_ptr<std::string>;
+
+// Create an empty NFT (convient in some scenarios).
+NFT create_empty_nft();
+// Create a NFT with the given name.
+NFT create_nft(const std::string& name);
+
+// Define the functions in the nft.hxx file.
+#include "nft.hxx"
diff --git a/graphs/cpp/my_nfts/nft.hxx b/graphs/cpp/my_nfts/nft.hxx
new file mode 100644
index 0000000..083f10f
--- /dev/null
+++ b/graphs/cpp/my_nfts/nft.hxx
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "nft.hh"
+inline NFT create_empty_nft()
+{
+    return nullptr;
+}
+inline NFT create_nft(const std::string& name)
+{
+    return std::make_unique<std::string>(name);
+}
\ No newline at end of file
diff --git a/graphs/cpp/my_nfts/person.cc b/graphs/cpp/my_nfts/person.cc
new file mode 100644
index 0000000..cf4b291
--- /dev/null
+++ b/graphs/cpp/my_nfts/person.cc
@@ -0,0 +1,61 @@
+#include "person.hh"
+
+#include <algorithm>
+Person::Person(const std::string& name, uint money)
+    : name_{ name }
+    , money_{ money }
+{}
+std::vector<std::string> Person::enumerate_nfts() const
+{
+    std::vector<std::string> res;
+    for (auto nft = nfts_.begin(); nft != nfts_.end(); nft++)
+    {
+        res.push_back(**nft);
+    }
+    return res;
+}
+void Person::add_nft(NFT nft)
+{
+    nfts_.push_back(std::move(nft));
+}
+NFT Person::remove_nft(const std::string& name)
+{
+    auto pos = std::find_if(nfts_.begin(), nfts_.end(),
+                            [&](NFT const& nft) { return *nft == name; });
+    if (pos == nfts_.end())
+        return create_empty_nft();
+    nfts_.erase(pos);
+    return create_nft(name);
+}
+void Person::add_money(uint money)
+{
+    money_ += money;
+}
+bool Person::remove_money(uint money)
+{
+    if (money > money_)
+        return false;
+    money_ -= money;
+    return true;
+}
+uint Person::get_money() const
+{
+    return money_;
+}
+const std::string& Person::get_name() const
+{
+    return name_;
+}
+std::ostream& operator<<(std::ostream& os, const Person& p)
+{
+    os << "Name: " << p.get_name() << "\nMoney: " << p.get_money() << "\nNFTs:";
+    if (const std::vector<std::string> nfts = p.enumerate_nfts(); !nfts.empty())
+    {
+        for (size_t i = 0; i < nfts.size(); ++i)
+        {
+            os << " " << nfts.at(i);
+        }
+    }
+    os << "\n";
+    return os;
+}
diff --git a/graphs/cpp/my_nfts/person.hh b/graphs/cpp/my_nfts/person.hh
new file mode 100644
index 0000000..90a2e16
--- /dev/null
+++ b/graphs/cpp/my_nfts/person.hh
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <ostream>
+#include <vector>
+
+#include "nft.hh"
+
+// A person
+class Person
+{
+public:
+    // Initiliaze its member attributes.
+    Person(const std::string& name, uint money);
+
+    // Returns the list of NFTs it owns.
+    std::vector<std::string> enumerate_nfts() const;
+
+    // Give it a NFT.
+    void add_nft(NFT nft);
+    // Take away a NFT.
+    NFT remove_nft(const std::string& name);
+
+    // Add money.
+    void add_money(uint money);
+    // Remove money, if possible.
+    bool remove_money(uint money);
+
+    // Getters for money and name.
+    uint get_money() const;
+    const std::string& get_name() const;
+
+private:
+    std::string name_;
+    uint money_;
+    std::vector<NFT> nfts_;
+};
+
+// Write informations about the person on the given stream.
+std::ostream& operator<<(std::ostream& os, const Person& p);
diff --git a/graphs/cpp/path/path.cc b/graphs/cpp/path/path.cc
new file mode 100644
index 0000000..bff3a55
--- /dev/null
+++ b/graphs/cpp/path/path.cc
@@ -0,0 +1,10 @@
+#include "path.hh"
+
+Path& Path::join(const std::string& tail, bool is_file)
+{
+    if (final_)
+        return *this;
+    path_.push_back(tail);
+    final_ = is_file;
+    return *this;
+}
\ No newline at end of file
diff --git a/graphs/cpp/path/path.hh b/graphs/cpp/path/path.hh
new file mode 100644
index 0000000..0a09d05
--- /dev/null
+++ b/graphs/cpp/path/path.hh
@@ -0,0 +1,25 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+class Path
+{
+public:
+    Path() = default;
+    virtual ~Path() = default;
+
+    /*
+    ** Return the complete path as a string.
+    */
+    virtual std::string to_string() const = 0;
+
+    /*
+    ** Add a directory or a file at the end of the path.
+    */
+    virtual Path& join(const std::string& tail, bool is_file = false);
+
+protected:
+    std::vector<std::string> path_;
+    bool final_ = false;
+};
diff --git a/graphs/cpp/path/path_example.cc b/graphs/cpp/path/path_example.cc
new file mode 100644
index 0000000..f35c605
--- /dev/null
+++ b/graphs/cpp/path/path_example.cc
@@ -0,0 +1,22 @@
+#include <iostream>
+
+#include "unix_path.hh"
+#include "windows_path.hh"
+
+int main()
+{
+    auto windows_path = WindowsPath('E');
+
+    std::cout << windows_path.join("Users").join("YAKA").join("cpp").to_string()
+              << '\n'; /* E:\Users\YAKA\cpp\ */
+
+    auto unix_path = UnixPath();
+
+    std::cout << unix_path.join("home").join("yaka").join("cpp").to_string()
+              << '\n'; // /home/yaka/cpp/
+
+    std::cout << unix_path.join("main.cc", true).to_string()
+              << '\n'; // /home/yaka/cpp/main.cc
+
+    return 0;
+}
diff --git a/graphs/cpp/path/unix_path.cc b/graphs/cpp/path/unix_path.cc
new file mode 100644
index 0000000..dfd51b5
--- /dev/null
+++ b/graphs/cpp/path/unix_path.cc
@@ -0,0 +1,25 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#include "unix_path.hh"
+
+#include <sstream>
+UnixPath::UnixPath()
+    : Path()
+{}
+
+std::string UnixPath::to_string() const
+{
+    if (path_.empty())
+        return "/";
+    std::ostringstream os;
+    os << "/" << path_[0];
+    for (size_t i = 1; i < path_.size(); i++)
+    {
+        os << "/" << path_[i];
+    }
+    if (!final_)
+        os << "/";
+    return os.str();
+}
\ No newline at end of file
diff --git a/graphs/cpp/path/unix_path.hh b/graphs/cpp/path/unix_path.hh
new file mode 100644
index 0000000..22976ed
--- /dev/null
+++ b/graphs/cpp/path/unix_path.hh
@@ -0,0 +1,13 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#pragma once
+#include "path.hh"
+
+class UnixPath : public Path
+{
+public:
+    UnixPath();
+    std::string to_string() const override;
+};
diff --git a/graphs/cpp/path/windows_path.cc b/graphs/cpp/path/windows_path.cc
new file mode 100644
index 0000000..cc94afa
--- /dev/null
+++ b/graphs/cpp/path/windows_path.cc
@@ -0,0 +1,37 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#include "windows_path.hh"
+
+#include <sstream>
+WindowsPath::WindowsPath(char drive)
+    : Path()
+{
+    path_.push_back(std::string{ drive } + std::string{ ':' });
+}
+std::string WindowsPath::to_string() const
+{
+    if (path_.empty())
+        return "";
+    std::ostringstream os;
+    os << path_[0];
+    for (size_t i = 1; i < path_.size(); i++)
+    {
+        os << "\\" << path_[i];
+    }
+    if (!final_)
+        os << "\\";
+    return os.str();
+}
+Path& WindowsPath::join(const std::string& tail, bool is_file)
+{
+    // :, ", |, ?, *
+    if (tail.find(':') != std::string::npos
+        || tail.find('\"') != std::string::npos
+        || tail.find('|') != std::string::npos
+        || tail.find('?') != std::string::npos
+        || tail.find('*') != std::string::npos)
+        return *this;
+    return Path::join(tail, is_file);
+}
\ No newline at end of file
diff --git a/graphs/cpp/path/windows_path.hh b/graphs/cpp/path/windows_path.hh
new file mode 100644
index 0000000..4bd9e2b
--- /dev/null
+++ b/graphs/cpp/path/windows_path.hh
@@ -0,0 +1,14 @@
+//
+// Created by martial.simon on 2/25/25.
+//
+
+#pragma once
+#include "path.hh"
+
+class WindowsPath : public Path
+{
+public:
+    WindowsPath(char drive);
+    std::string to_string() const override;
+    Path& join(const std::string& tail, bool is_file = false) override;
+};
diff --git a/graphs/cpp/point/CMakeLists.txt b/graphs/cpp/point/CMakeLists.txt
new file mode 100644
index 0000000..0933e1c
--- /dev/null
+++ b/graphs/cpp/point/CMakeLists.txt
@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.30)
+project(point)
+
+set(CMAKE_CXX_STANDARD 20)
+
+add_executable(point main.cc
+        point.cc)
diff --git a/graphs/cpp/point/main.cc b/graphs/cpp/point/main.cc
new file mode 100644
index 0000000..df28b27
--- /dev/null
+++ b/graphs/cpp/point/main.cc
@@ -0,0 +1,7 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello, World!" << std::endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/graphs/cpp/point/point.cc b/graphs/cpp/point/point.cc
new file mode 100644
index 0000000..557cab9
--- /dev/null
+++ b/graphs/cpp/point/point.cc
@@ -0,0 +1,14 @@
+#include "point.hh"
+
+#include <iostream>
+
+void Point::display() const
+{
+    std::cout << "(" << x_ << ", " << y_ << ")";
+}
+
+void Point::shift(const int dx, const int dy)
+{
+    x_ += dx;
+    y_ += dy;
+}
diff --git a/graphs/cpp/point/point.hh b/graphs/cpp/point/point.hh
new file mode 100644
index 0000000..1e33fc8
--- /dev/null
+++ b/graphs/cpp/point/point.hh
@@ -0,0 +1,12 @@
+#pragma once
+
+class Point
+{
+public:
+    void display() const;
+    void shift(int dx, int dy);
+
+private:
+    int x_ = 0;
+    int y_ = 0;
+};
\ No newline at end of file
diff --git a/graphs/cpp/ref_swap/main.cc b/graphs/cpp/ref_swap/main.cc
new file mode 100644
index 0000000..487ab6d
--- /dev/null
+++ b/graphs/cpp/ref_swap/main.cc
@@ -0,0 +1,17 @@
+#include <iostream>
+
+#include "ref_swap.hh"
+
+int main()
+{
+    int a = 3;
+    int b = 19;
+
+    std::cout << "Before: a = " << a << ", b = " << b << '\n';
+    ref_swap(a, b);
+    std::cout << "After: a = " << a << ", b = " << b << '\n';
+
+    std::cout << "Before: a = " << a << ", b = " << b << '\n';
+    ptr_swap(&a, &b);
+    std::cout << "After: a = " << a << ", b = " << b << '\n';
+}
diff --git a/graphs/cpp/ref_swap/ref_swap.cc b/graphs/cpp/ref_swap/ref_swap.cc
new file mode 100644
index 0000000..44cb203
--- /dev/null
+++ b/graphs/cpp/ref_swap/ref_swap.cc
@@ -0,0 +1,18 @@
+//
+// Created by martial.simon on 2/24/25.
+//
+void ref_swap(int& a, int& b)
+{
+    int tmp = a;
+    a = b;
+    b = tmp;
+}
+
+void ptr_swap(int* a, int* b)
+{
+    if (!a || !b)
+        return;
+    int tmp = *a;
+    *a = *b;
+    *b = tmp;
+}
\ No newline at end of file
diff --git a/graphs/cpp/ref_swap/ref_swap.hh b/graphs/cpp/ref_swap/ref_swap.hh
new file mode 100644
index 0000000..1f194b3
--- /dev/null
+++ b/graphs/cpp/ref_swap/ref_swap.hh
@@ -0,0 +1,5 @@
+#pragma once
+
+void ref_swap(int& a, int& b);
+
+void ptr_swap(int* a, int* b);
diff --git a/graphs/cpp/replace/inputfile b/graphs/cpp/replace/inputfile
new file mode 100644
index 0000000..b4e5a2f
--- /dev/null
+++ b/graphs/cpp/replace/inputfile
@@ -0,0 +1 @@
+abcabcbc
\ No newline at end of file
diff --git a/graphs/cpp/replace/replace.cc b/graphs/cpp/replace/replace.cc
new file mode 100644
index 0000000..c24bf05
--- /dev/null
+++ b/graphs/cpp/replace/replace.cc
@@ -0,0 +1,39 @@
+#include "replace.hh"
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+void replace(const std::string& input_filename,
+             const std::string& output_filename, const std::string& src_token,
+             const std::string& dst_token)
+{
+    std::ofstream file_out;
+    file_out.open(output_filename);
+
+    if (!file_out.is_open())
+    {
+        std::cerr << "Cannot write output file\n";
+        return;
+    }
+
+    std::ifstream file_in;
+    file_in.open(input_filename);
+    if (!file_in.is_open())
+    {
+        std::cerr << "Cannot open input file\n";
+        return;
+    }
+
+    std::string token;
+    while (std::getline(file_in, token))
+    {
+        std::string::size_type n = 0;
+        while ((n = token.find(src_token, n)) != std::string::npos)
+        {
+            token.replace(n, src_token.size(), dst_token);
+            n += dst_token.size();
+        }
+        file_out << token << "\n";
+    }
+}
\ No newline at end of file
diff --git a/graphs/cpp/replace/replace.hh b/graphs/cpp/replace/replace.hh
new file mode 100644
index 0000000..cbb2e46
--- /dev/null
+++ b/graphs/cpp/replace/replace.hh
@@ -0,0 +1,6 @@
+#pragma once
+#include <string>
+
+void replace(const std::string& input_filename,
+             const std::string& output_filename, const std::string& src_token,
+             const std::string& dst_token);
\ No newline at end of file
diff --git a/graphs/cpp/replace/test_replace.cc b/graphs/cpp/replace/test_replace.cc
new file mode 100644
index 0000000..be7a488
--- /dev/null
+++ b/graphs/cpp/replace/test_replace.cc
@@ -0,0 +1,16 @@
+#include <iostream>
+
+#include "replace.hh"
+
+int main(int argc, char** argv)
+{
+    if (argc < 5)
+    {
+        std::cerr << "Usage: INPUT_FILE OUTPUT_FILE SRC_TOKEN DST_TOKEN\n";
+        return 1;
+    }
+
+    replace(argv[1], argv[2], argv[3], argv[4]);
+
+    return 0;
+}
diff --git a/graphs/cpp/singleton/singleton.cc b/graphs/cpp/singleton/singleton.cc
new file mode 100644
index 0000000..711e702
--- /dev/null
+++ b/graphs/cpp/singleton/singleton.cc
@@ -0,0 +1,21 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#include "singleton.hh"
+
+#include <iostream>
+#include <string>
+
+void Logger::open_log_file(const std::string& file)
+{
+    std::cout << "LOG: Opening file " << file << "\n";
+}
+void Logger::write_to_log_file()
+{
+    std::cout << "LOG: Writing into log file ...\n";
+}
+void Logger::close_log_file()
+{
+    std::cout << "LOG: Closing log file ...\n";
+}
diff --git a/graphs/cpp/singleton/singleton.hh b/graphs/cpp/singleton/singleton.hh
new file mode 100644
index 0000000..715a85f
--- /dev/null
+++ b/graphs/cpp/singleton/singleton.hh
@@ -0,0 +1,33 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#pragma once
+#include <string>
+
+template <typename T>
+class Singleton
+{
+protected:
+    Singleton() = default;
+
+private:
+    Singleton(const Singleton<T>&) = delete;
+    Singleton& operator=(const Singleton<T>&) = delete;
+
+public:
+    static T& instance();
+};
+
+class Logger : public Singleton<Logger>
+{
+    Logger() = default;
+    friend class Singleton<Logger>;
+
+public:
+    void open_log_file(const std::string& file);
+    void write_to_log_file();
+    void close_log_file();
+};
+
+#include "singleton.hxx"
\ No newline at end of file
diff --git a/graphs/cpp/singleton/singleton.hxx b/graphs/cpp/singleton/singleton.hxx
new file mode 100644
index 0000000..04a36b8
--- /dev/null
+++ b/graphs/cpp/singleton/singleton.hxx
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "singleton.hh"
+template <typename T>
+T& Singleton<T>::instance()
+{
+    static T instance_;
+    return instance_;
+}
\ No newline at end of file
diff --git a/graphs/cpp/smtptr/main.cc b/graphs/cpp/smtptr/main.cc
new file mode 100644
index 0000000..a574d45
--- /dev/null
+++ b/graphs/cpp/smtptr/main.cc
@@ -0,0 +1,20 @@
+#include "shared_pointer.hh"
+
+int main()
+{
+    // Lifetime of the data
+    {
+        SharedPointer<int> p2;
+        {
+            SharedPointer<int> p1{ new int{ 5 } };
+            p2 = p1; // Now both SharedPointers own the memory
+        }
+        // p1 is freed, but the int pointer remains
+        // Memory still exists, due to p2
+        std::cout << "Value of p2: " << *p2 << std::endl; // Output: 5
+    }
+    // p2 is freed, and since no one else owns the memory,
+    // the int pointer is freed too
+
+    return 0;
+}
diff --git a/graphs/cpp/smtptr/shared_pointer.hh b/graphs/cpp/smtptr/shared_pointer.hh
new file mode 100644
index 0000000..cc24243
--- /dev/null
+++ b/graphs/cpp/smtptr/shared_pointer.hh
@@ -0,0 +1,166 @@
+#pragma once
+
+#include <cassert>
+#include <iostream>
+#include <string>
+
+template <typename T>
+class SharedPointer
+{
+public:
+    // The type pointed to.
+    using element_type = T;
+
+    /**
+    ** \brief Construct a counted reference to a newly allocated object.
+    */
+    SharedPointer(element_type* p = nullptr);
+
+    /**
+    ** \brief Destroy the SharedPointer.
+    ** The object pointed to is destroyed only if it is not referenced anymore.
+    ** Take care to free everything ...
+    */
+    ~SharedPointer();
+
+    /**
+    ** \brief Copy constructor.
+    ** \return A new SharedPointer, pointing
+    ** to the underlying data of \a other.
+    **
+    ** Although the implementation is subsumed by the previous, more
+    ** generic one, the C++ standard still mandates this specific
+    ** signature.  Otherwise, the compiler will provide a default
+    ** implementation, which is of course wrong.  Note that the
+    ** same applies for the assignment operator.
+    */
+    SharedPointer(const SharedPointer<element_type>& other);
+
+    /// \name Assignments.
+    /// \{
+
+    /**
+    ** \brief Replace the underlying data with \a p
+    ** A call to \c reset is strictly equivalent to:
+    ** \code
+    **     r = SharedPointer<element_type>(p);
+    ** \endcode
+    ** This line implicitly calls the destructor of \a r before assigning
+    ** it a new value.
+    ** \warning You can't reset your \c SharedPointer with the
+    ** same pointer as the current one. In this case, nothing should
+    ** be done.
+    ** \warning Be mindful of other \c SharedPointers
+    ** which could also be pointing to the same data.
+    */
+    void reset(element_type* p);
+
+    /**
+    ** \brief Reference assignment
+    ** Its behavior is similar to \c reset() but you
+    ** have to use the existing SharedPointer \a other
+    ** instead of creating a new instance.
+    */
+    SharedPointer<element_type>&
+    operator=(const SharedPointer<element_type>& other);
+    /// \}
+
+    /// \name Access to data.
+    /// \{
+
+    // Access via a reference.
+    element_type& operator*() const;
+    // Access via a pointer.
+    element_type* operator->() const;
+
+    // Returns the underlying data pointer.
+    element_type* get() const;
+
+    // Returns the number of SharedPointer objects referring to the same managed
+    // object
+    long use_count() const;
+    /// \}
+
+    /// \name Equality operators.
+    /// \{
+
+    /**
+    ** \brief Reference comparison.
+    ** Returns true if the two references point to the same object.
+    */
+    template <typename U>
+    bool operator==(const SharedPointer<U>& rhs) const;
+
+    /**
+    ** \brief Reference comparison.
+    ** Returns false if the two references point to the same object.
+    */
+    template <typename U>
+    bool operator!=(const SharedPointer<U>& rhs) const;
+
+    /**
+    ** \brief Reference comparison.
+    ** Returns true if this points to \a p.
+    */
+    bool operator==(const element_type* p) const;
+
+    /**
+    ** \brief Reference comparison.
+    ** Returns false if this points to \a p.
+    */
+    bool operator!=(const element_type* p) const;
+
+    /**
+     ** \brief Move assignment operator for SharedPointer.
+     **
+     ** This operator transfers ownership of the managed object from the
+     ** \a other to this SharePointer.
+     ** After the assignment, the \a other will be empty.
+     ** \warning Don't forget to update the reference counter.
+     **
+     ** Returns a reference to this SharedPointer.
+     */
+    SharedPointer<element_type>& operator=(SharedPointer&& other) noexcept;
+
+    /**
+     ** \brief Move constructor for SharedPointer.
+     **
+     ** This constructor transfers ownership of the managed object from \a other
+     ** SharedPointer to the newly created SharedPointer.
+     **
+     */
+    SharedPointer(SharedPointer&& other);
+
+    /// \}
+
+    /**
+    ** \brief Test for validity
+    ** Returns true if the reference is valid, i.e. it points to an object.
+    ** This conversion operator allows users to write:
+    **
+    ** \code
+    ** SharedPointer<int> p1;
+    ** if (p1) // Here false
+    **   ...
+    ** \endcode
+    */
+    operator bool() const;
+
+    /**
+    ** \brief Test fellowship.
+    ** Returns true if the SharedPointer points to an object which
+    ** is of the specified type.
+    ** Look at the given example file shared_pointer_is_a.cc
+    ** to better understand its purpose.
+    */
+    template <typename U>
+    bool is_a() const;
+
+private:
+    // Pointer to the underlying data.
+    element_type* data_;
+    // A counter shared between all ref pointers to \a data_.
+    long* count_;
+};
+
+#include "shared_pointer.hxx"
diff --git a/graphs/cpp/smtptr/shared_pointer.hxx b/graphs/cpp/smtptr/shared_pointer.hxx
new file mode 100644
index 0000000..fbc0792
--- /dev/null
+++ b/graphs/cpp/smtptr/shared_pointer.hxx
@@ -0,0 +1,144 @@
+#pragma once
+#include "shared_pointer.hh"
+template <typename T>
+SharedPointer<T>::SharedPointer(element_type* p)
+{
+    if (p == nullptr)
+    {
+        data_ = nullptr;
+        count_ = nullptr;
+    }
+    else
+    {
+        data_ = p;
+        count_ = new long{ 1 };
+    }
+}
+template <typename T>
+SharedPointer<T>::~SharedPointer()
+{
+    if (count_ != nullptr)
+    {
+        (*count_)--;
+        if (*count_ == 0)
+        {
+            delete count_;
+            if (data_ != nullptr)
+                delete data_;
+        }
+    }
+}
+template <typename T>
+SharedPointer<T>::SharedPointer(const SharedPointer<element_type>& other)
+{
+    this->~SharedPointer();
+    data_ = other.data_;
+    if (data_ == nullptr)
+        count_ = nullptr;
+    count_ = other.count_;
+    if (count_ != nullptr)
+        (*count_)++;
+}
+template <typename T>
+void SharedPointer<T>::reset(element_type* p)
+{
+    if (data_ == p)
+        return;
+    this->~SharedPointer();
+    data_ = p;
+    if (p == nullptr)
+        count_ = nullptr;
+    else
+        count_ = new long{ 1 };
+}
+template <typename T>
+SharedPointer<T>& SharedPointer<T>::operator=(const SharedPointer<T>& other)
+{
+    this->~SharedPointer();
+
+    data_ = other.data_;
+    count_ = other.count_;
+    if (nullptr != other.data_)
+    {
+        (*this->count_)++;
+    }
+    return *this;
+}
+template <typename T>
+T& SharedPointer<T>::operator*() const
+{
+    return *data_;
+}
+
+template <typename T>
+T* SharedPointer<T>::operator->() const
+{
+    return data_;
+}
+template <typename T>
+T* SharedPointer<T>::get() const
+{
+    return data_;
+}
+template <typename T>
+long SharedPointer<T>::use_count() const
+{
+    if (count_ == nullptr)
+        return 0;
+    return *count_;
+}
+template <typename T>
+template <typename U>
+bool SharedPointer<T>::operator==(const SharedPointer<U>& rhs) const
+{
+    if (rhs.data_ == this->data_)
+        return true;
+    return false;
+}
+template <typename T>
+template <typename U>
+bool SharedPointer<T>::operator!=(const SharedPointer<U>& rhs) const
+{
+    return !(*this == rhs);
+}
+template <typename T>
+bool SharedPointer<T>::operator==(const T* p) const
+{
+    return this->data_ == p;
+}
+template <typename T>
+bool SharedPointer<T>::operator!=(const T* p) const
+{
+    return this->data_ != p;
+}
+template <typename T>
+SharedPointer<T>& SharedPointer<T>::operator=(SharedPointer<T>&& other) noexcept
+{
+    this->~SharedPointer();
+    data_ = other.data_;
+    count_ = other.count_;
+    other.data_ = nullptr;
+    other.count_ = nullptr;
+    return *this;
+}
+template <typename T>
+SharedPointer<T>::SharedPointer(SharedPointer&& other)
+{
+    this->~SharedPointer();
+    data_ = other.data_;
+    count_ = other.count_;
+
+    other.data_ = nullptr;
+    other.count_ = nullptr;
+}
+template <typename T>
+SharedPointer<T>::operator bool() const
+{
+    return data_ != nullptr;
+}
+template <typename T>
+template <typename U>
+bool SharedPointer<T>::is_a() const
+{
+    return dynamic_cast<U*>(data_);
+}
\ No newline at end of file
diff --git a/graphs/cpp/smtptr/shared_pointer_is_a.cc b/graphs/cpp/smtptr/shared_pointer_is_a.cc
new file mode 100644
index 0000000..b6dcb95
--- /dev/null
+++ b/graphs/cpp/smtptr/shared_pointer_is_a.cc
@@ -0,0 +1,47 @@
+#include "shared_pointer.hh"
+
+class Animal
+{
+public:
+    virtual ~Animal()
+    {}
+};
+
+class Cat : public Animal
+{
+public:
+    void meow()
+    {
+        std::cout << "Meow!\n";
+    }
+};
+
+class Dog : public Animal
+{
+public:
+    void bark()
+    {
+        std::cout << "Woof!\n";
+    }
+};
+
+int main()
+{
+    SharedPointer<Animal> animalPtr{ new Cat };
+    if (animalPtr.is_a<Cat>())
+    { // true
+        std::cout << "The pointer points to a Cat.\n";
+    }
+
+    SharedPointer<Animal> animalPtr2{ new Dog };
+    if (animalPtr2.is_a<Cat>())
+    { // false
+        std::cout << "The pointer points to a Cat.\n";
+    }
+    else if (animalPtr2.is_a<Dog>())
+    {
+        std::cout << "The pointer points to a Dog.\n";
+    }
+
+    return 0;
+}
diff --git a/graphs/cpp/stdin_to_file/stdin_to_file.cc b/graphs/cpp/stdin_to_file/stdin_to_file.cc
new file mode 100644
index 0000000..c1519e3
--- /dev/null
+++ b/graphs/cpp/stdin_to_file/stdin_to_file.cc
@@ -0,0 +1,20 @@
+#include "stdin_to_file.hh"
+
+#include <fstream>
+#include <iostream>
+long int stdin_to_file(const std::string& filename)
+{
+    std::ofstream file_out;
+    std::string token;
+    // trying to open output file "data.out"
+    file_out.open(filename);
+    size_t res = 0;
+    // Read until eof or an error occurs
+    while (std::cin >> token)
+    {
+        res++;
+        file_out << token << '\n';
+    }
+    // stream is closed at the end of the scope
+    return res;
+}
\ No newline at end of file
diff --git a/graphs/cpp/stdin_to_file/stdin_to_file.hh b/graphs/cpp/stdin_to_file/stdin_to_file.hh
new file mode 100644
index 0000000..9aac89d
--- /dev/null
+++ b/graphs/cpp/stdin_to_file/stdin_to_file.hh
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <fstream>
+#include <iostream>
+
+long int stdin_to_file(const std::string& filename);
diff --git a/graphs/cpp/stdin_to_file/stdin_to_file_example.cc b/graphs/cpp/stdin_to_file/stdin_to_file_example.cc
new file mode 100644
index 0000000..3bc211d
--- /dev/null
+++ b/graphs/cpp/stdin_to_file/stdin_to_file_example.cc
@@ -0,0 +1,10 @@
+#include <iostream>
+
+#include "stdin_to_file.hh"
+
+int main()
+{
+    auto word_count = stdin_to_file("file.out");
+    std::cout << "File has " << word_count << " words\n";
+    return 0;
+}
diff --git a/graphs/cpp/visitor/compute_visitor.cc b/graphs/cpp/visitor/compute_visitor.cc
new file mode 100644
index 0000000..1e4e6dd
--- /dev/null
+++ b/graphs/cpp/visitor/compute_visitor.cc
@@ -0,0 +1,62 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#include "compute_visitor.hh"
+
+#include <stdexcept>
+
+#include "add.hh"
+#include "div.hh"
+#include "leaf.hh"
+#include "mul.hh"
+#include "sub.hh"
+void visitor::ComputeVisitor::visit(const tree::Tree& e)
+{
+    Visitor::visit(e);
+    value_ = get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::Node& e)
+{
+    visit(*e.get_lhs());
+    visit(*e.get_rhs());
+    value_ = get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::AddNode& e)
+{
+    visit(*e.get_lhs());
+    int lhs = get_value();
+    Visitor::visit(*e.get_rhs());
+    value_ = lhs + get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::SubNode& e)
+{
+    visit(*e.get_lhs());
+    int lhs = get_value();
+    Visitor::visit(*e.get_rhs());
+    value_ = lhs - get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::MulNode& e)
+{
+    visit(*e.get_lhs());
+    int lhs = get_value();
+    Visitor::visit(*e.get_rhs());
+    value_ = lhs * get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::DivNode& e)
+{
+    visit(*e.get_lhs());
+    int lhs = get_value();
+    visit(*e.get_rhs());
+    if (get_value() == 0)
+        throw std::overflow_error{ "Divide by zero exception" };
+    value_ = lhs / get_value();
+}
+void visitor::ComputeVisitor::visit(const tree::Leaf& e)
+{
+    value_ = std::stoi(e.get_value());
+}
+int visitor::ComputeVisitor::get_value()
+{
+    return value_;
+}
diff --git a/graphs/cpp/visitor/compute_visitor.hh b/graphs/cpp/visitor/compute_visitor.hh
new file mode 100644
index 0000000..0426f29
--- /dev/null
+++ b/graphs/cpp/visitor/compute_visitor.hh
@@ -0,0 +1,26 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#pragma once
+
+#include "visitor.hh"
+
+namespace visitor
+{
+    class ComputeVisitor : public Visitor
+    {
+    public:
+        void visit(const tree::Tree& e);
+        void visit(const tree::Node& e);
+        void visit(const tree::AddNode& e);
+        void visit(const tree::SubNode& e);
+        void visit(const tree::MulNode& e);
+        void visit(const tree::DivNode& e);
+        void visit(const tree::Leaf& e);
+        int get_value();
+
+    private:
+        int value_ = 0;
+    };
+} // namespace visitor
diff --git a/graphs/cpp/visitor/print_visitor.cc b/graphs/cpp/visitor/print_visitor.cc
new file mode 100644
index 0000000..bcfd565
--- /dev/null
+++ b/graphs/cpp/visitor/print_visitor.cc
@@ -0,0 +1,58 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#include "print_visitor.hh"
+
+#include <iostream>
+
+#include "add.hh"
+#include "div.hh"
+#include "leaf.hh"
+#include "mul.hh"
+#include "sub.hh"
+void visitor::PrintVisitor::visit(const tree::Tree& e)
+{
+    Visitor::visit(e);
+}
+void visitor::PrintVisitor::visit(const tree::Node& e)
+{
+    visit(*e.get_lhs());
+    visit(*e.get_rhs());
+}
+void visitor::PrintVisitor::visit(const tree::AddNode& e)
+{
+    std::cout << "(";
+    visit(*e.get_lhs());
+    std::cout << " + ";
+    visit(*e.get_rhs());
+    std::cout << ")";
+}
+void visitor::PrintVisitor::visit(const tree::SubNode& e)
+{
+    std::cout << "(";
+    visit(*e.get_lhs());
+    std::cout << " - ";
+    visit(*e.get_rhs());
+    std::cout << ")";
+}
+void visitor::PrintVisitor::visit(const tree::MulNode& e)
+{
+    std::cout << "(";
+    visit(*e.get_lhs());
+    std::cout << " * ";
+    visit(*e.get_rhs());
+    std::cout << ")";
+}
+void visitor::PrintVisitor::visit(const tree::DivNode& e)
+{
+    std::cout << "(";
+    visit(*e.get_lhs());
+    std::cout << " / ";
+    visit(*e.get_rhs());
+    std::cout << ")";
+}
+void visitor::PrintVisitor::visit(const tree::Leaf& e)
+{
+    std::cout << e.get_value();
+}
\ No newline at end of file
diff --git a/graphs/cpp/visitor/print_visitor.hh b/graphs/cpp/visitor/print_visitor.hh
new file mode 100644
index 0000000..aa0ea4c
--- /dev/null
+++ b/graphs/cpp/visitor/print_visitor.hh
@@ -0,0 +1,25 @@
+//
+// Created by martial.simon on 2/27/25.
+//
+
+#pragma once
+
+#include "visitor.hh"
+
+namespace visitor
+{
+    class PrintVisitor : public Visitor
+    {
+    public:
+        void visit(const tree::Tree& e);
+        void visit(const tree::Node& e);
+        void visit(const tree::AddNode& e);
+        void visit(const tree::SubNode& e);
+        void visit(const tree::MulNode& e);
+        void visit(const tree::DivNode& e);
+        void visit(const tree::Leaf& e);
+
+    private:
+        int value_ = 0;
+    };
+} // namespace visitor
diff --git a/graphs/cpp/war/assassin.cc b/graphs/cpp/war/assassin.cc
new file mode 100644
index 0000000..090ec8b
--- /dev/null
+++ b/graphs/cpp/war/assassin.cc
@@ -0,0 +1,5 @@
+#include "assassin.hh"
+
+Assassin::Assassin()
+    : Soldier(10, 9, "Out of the shadows!")
+{}
diff --git a/graphs/cpp/war/assassin.hh b/graphs/cpp/war/assassin.hh
new file mode 100644
index 0000000..548fd8b
--- /dev/null
+++ b/graphs/cpp/war/assassin.hh
@@ -0,0 +1,8 @@
+#pragma once
+#include "soldier.hh"
+
+class Assassin : public Soldier
+{
+public:
+    Assassin();
+};
\ No newline at end of file
diff --git a/graphs/cpp/war/knight.cc b/graphs/cpp/war/knight.cc
new file mode 100644
index 0000000..be52105
--- /dev/null
+++ b/graphs/cpp/war/knight.cc
@@ -0,0 +1,5 @@
+#include "knight.hh"
+
+Knight::Knight()
+    : Soldier(20, 5, "Be quick or be dead!")
+{}
diff --git a/graphs/cpp/war/knight.hh b/graphs/cpp/war/knight.hh
new file mode 100644
index 0000000..d4f2b5f
--- /dev/null
+++ b/graphs/cpp/war/knight.hh
@@ -0,0 +1,8 @@
+#pragma once
+#include "soldier.hh"
+
+class Knight : public Soldier
+{
+public:
+    Knight();
+};
\ No newline at end of file
diff --git a/graphs/cpp/war/regiment.cc b/graphs/cpp/war/regiment.cc
new file mode 100644
index 0000000..3534ced
--- /dev/null
+++ b/graphs/cpp/war/regiment.cc
@@ -0,0 +1,38 @@
+#include "regiment.hh"
+
+#include <vector>
+
+void Regiment::join_by(Regiment& r)
+{
+    if (r.soldiers_.empty())
+        return;
+    std::vector<Soldier*> v{ r.soldiers_.rbegin(), r.soldiers_.rend() };
+    while (!v.empty())
+    {
+        this->soldiers_.push_back(v.back());
+        v.pop_back();
+    }
+    r.soldiers_.clear();
+}
+size_t Regiment::count() const
+{
+    return soldiers_.size();
+}
+void Regiment::add_soldier(Soldier* s)
+{
+    soldiers_.push_back(s);
+}
+void Regiment::print_state() const
+{
+    for (auto soldier : soldiers_)
+    {
+        soldier->print_state();
+    }
+}
+void Regiment::scream() const
+{
+    for (auto soldier : soldiers_)
+    {
+        soldier->scream();
+    }
+}
\ No newline at end of file
diff --git a/graphs/cpp/war/regiment.hh b/graphs/cpp/war/regiment.hh
new file mode 100644
index 0000000..ac54953
--- /dev/null
+++ b/graphs/cpp/war/regiment.hh
@@ -0,0 +1,17 @@
+#pragma once
+#include <vector>
+
+#include "soldier.hh"
+
+class Regiment
+{
+public:
+    void join_by(Regiment& r);
+    size_t count() const;
+    void add_soldier(Soldier* s);
+    void print_state() const;
+    void scream() const;
+
+private:
+    std::vector<Soldier*> soldiers_;
+};
\ No newline at end of file
diff --git a/graphs/cpp/war/soldier.cc b/graphs/cpp/war/soldier.cc
new file mode 100644
index 0000000..01dc57c
--- /dev/null
+++ b/graphs/cpp/war/soldier.cc
@@ -0,0 +1,24 @@
+#include "soldier.hh"
+
+#include <iostream>
+
+Soldier::Soldier(int hp, int dmg, std::string scream)
+    : health_points_{ hp }
+    , damage_{ dmg }
+    , scream_{ scream }
+{}
+
+void Soldier::print_state() const
+{
+    std::cout << "I have " << health_points_ << " health points.\n";
+}
+
+void Soldier::scream() const
+{
+    std::cout << scream_ << "\n";
+}
+
+void Soldier::attack(Soldier& s)
+{
+    s.health_points_ -= this->damage_;
+}
diff --git a/graphs/cpp/war/soldier.hh b/graphs/cpp/war/soldier.hh
new file mode 100644
index 0000000..1406022
--- /dev/null
+++ b/graphs/cpp/war/soldier.hh
@@ -0,0 +1,16 @@
+#pragma once
+#include <string>
+
+class Soldier
+{
+public:
+    Soldier(int hp, int dmg, std::string scream);
+    void attack(Soldier& s);
+    void print_state() const;
+    virtual void scream() const;
+
+private:
+    int health_points_;
+    int damage_;
+    std::string scream_;
+};
\ No newline at end of file
diff --git a/graphs/java/.gitignore b/graphs/java/.gitignore
new file mode 100644
index 0000000..d951fc9
--- /dev/null
+++ b/graphs/java/.gitignore
@@ -0,0 +1,81 @@
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+*.tar
+# User-specific stuff
+.idea/
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+target/
+Main.java
diff --git a/graphs/java/classics/.gitignore b/graphs/java/classics/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/classics/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/classics/pom.xml b/graphs/java/classics/pom.xml
new file mode 100644
index 0000000..ce852cb
--- /dev/null
+++ b/graphs/java/classics/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>classics</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>2.22.2</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/classics/src/main/java/fr/epita/assistants/classics/Classics.java b/graphs/java/classics/src/main/java/fr/epita/assistants/classics/Classics.java
new file mode 100644
index 0000000..9be12e2
--- /dev/null
+++ b/graphs/java/classics/src/main/java/fr/epita/assistants/classics/Classics.java
@@ -0,0 +1,104 @@
+package fr.epita.assistants.classics;
+
+public class Classics {
+    /**
+     * Computes the factorial of n.
+     *
+     * @param n the nth value to compute, negative values should return -1
+     * @return the long value of n!
+     */
+    public static long factorial(int n) {
+        if (n < 0) return -1;
+        if (n == 0) return 1;
+        return n * factorial(n - 1);
+    }
+
+    /**
+     * Computes the nth value of the tribonacci suite.
+     * f(0) = 0, f(1) = 1, f(2) = 1, f(n+3) = f(n) + f(n+1) + f(n+2)
+     *
+     * @param n the nth sequence to compute
+     */
+    public static long tribonacci(int n) {
+        if (n < 0)
+            return -1;
+        if (n == 0) {
+            return 0;
+        }
+        long fst = 0;
+        if (n < 3) return 1;
+        long sec = 1;
+        long thd = 1;
+        while (n >= 3) {
+            long t = fst + sec + thd;
+            fst = sec;
+            sec = thd;
+            thd = t;
+            n--;
+        }
+        return thd;
+    }
+
+    /**
+     * Checks if a word is a palindrome.
+     *
+     * @param word the string to check
+     * @return true if the word is a palindrome, false otherwise.
+     */
+    public static boolean isPalindrome(String word) {
+        if (word == null) return false;
+        word = word.toLowerCase().strip();
+        if (word.isEmpty()) return true;
+        for (int i = 0, j = word.length() - 1; i < j; i++, j--) {
+            while (word.charAt(i) == ' ') {
+                i++;
+            }
+            while (word.charAt(j) == ' ') {
+                j--;
+            }
+            if (word.charAt(i) != word.charAt(j)) return false;
+        }
+        return true;
+    }
+
+    /**
+     * Sorts an array using an insertion sort.
+     *
+     * @param array the array to sort in place
+     */
+    public static void insertionSort(int[] array) {
+        if (array.length == 0) {
+            return;
+        }
+        for (int i = 1; i < array.length; i++) {
+            for (int j = i; j > 0 && array[j - 1] > array[j]; j--) {
+                int tmp = array[j];
+                array[j] = array[j - 1];
+                array[j - 1] = tmp;
+            }
+        }
+    }
+
+    /**
+     * Combines two strings by alternating their characters. Must use a StringBuilder.
+     * If the strings do not have the same length, appends the remaining characters at the end of the result.
+     * For instance, combine("abc", "def") returns "adbecf"
+     */
+    public static String combine(String a, String b) {
+        if (a.isEmpty())
+            return b;
+        if (b.isEmpty())
+            return a;
+        StringBuilder sb = new StringBuilder();
+        int i;
+        for (i = 0; i < Math.min(a.length(), b.length()); i++) {
+            sb.append(a.charAt(i));
+            sb.append(b.charAt(i));
+        }
+        if (b.length() > a.length()) {
+            for (; i < b.length(); i++)
+                sb.append(b.charAt(i));
+        }
+        return new String(sb);
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/creatureInterface/.gitignore b/graphs/java/creatureInterface/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/creatureInterface/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/creatureInterface/pom.xml b/graphs/java/creatureInterface/pom.xml
new file mode 100644
index 0000000..1272b4c
--- /dev/null
+++ b/graphs/java/creatureInterface/pom.xml
@@ -0,0 +1,134 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>creatureInterface</artifactId>
+    <version>1.0</version>
+
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>2.22.2</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/BaseHuman.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/BaseHuman.java
new file mode 100644
index 0000000..308fde9
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/BaseHuman.java
@@ -0,0 +1,51 @@
+package fr.epita.assistants.creatureInterface;
+
+public abstract class BaseHuman extends Creature implements SpeakableInterface, SwimmingInterface{
+    /**
+     * Constructor for the Creature class.
+     *
+     * @param name The name of the creature
+     */
+    boolean inWater;
+    BaseHuman(String name) {
+        super(name);
+        inWater = false;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public void hello() {
+        System.out.println("Hello, my name is " + this.name + " and I'm a " + this.getClass().getSimpleName() + ".");
+    }
+
+    @Override
+    public void greet(SpeakableInterface contact) {
+        if (contact instanceof Human)
+            System.out.println("Hello " + contact.getName() + ", how are you?");
+        else
+            SpeakableInterface.super.greet(contact);
+    }
+
+    @Override
+    public void swim()
+    {
+        inWater = true;
+        System.out.println("I'm a " + this.getClass().getSimpleName() + " and I'm swimming.");
+    }
+
+    @Override
+    public boolean getSwimmingState()
+    {
+        return inWater;
+    }
+
+    @Override
+    public void emerge()
+    {
+        inWater = false;
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Creature.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Creature.java
new file mode 100644
index 0000000..1f63459
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Creature.java
@@ -0,0 +1,28 @@
+package fr.epita.assistants.creatureInterface;
+
+/**
+ * This abstract class provides a blueprint for creating creatures.
+ * All creatures extend this class.
+ */
+public abstract class Creature {
+    // The name of the creature
+    protected String name;
+
+    /**
+     * Constructor for the Creature class.
+     *
+     * @param name The name of the creature
+     */
+    Creature(String name) {
+        this.name = name;
+    }
+
+    /**
+     * Get the name of the creature.
+     *
+     * @return The name of the creature
+     */
+    public String getName() {
+        return name;
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Dragon.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Dragon.java
new file mode 100644
index 0000000..49ee99d
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Dragon.java
@@ -0,0 +1,74 @@
+package fr.epita.assistants.creatureInterface;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class Dragon extends Creature implements MagicalInterface, SpeakableInterface, FlyingInterface {
+    int mana;
+    Collection<Spell> spells = new ArrayList<Spell>();
+
+    public Dragon(String name, int mana) {
+        super(name);
+        this.mana = mana;
+    }
+
+    @Override
+    public void hello() {
+        System.out.println("Hello, my name is " + this.name + " and I'm a Dragon.");
+    }
+
+    @Override
+    public void greet(SpeakableInterface contact) {
+        if (contact instanceof Dragon) {
+            System.out.println("Greetings Lord " + contact.getName() + ".");
+            MagicalInterface.super.doSomeSparkles();
+        }
+        else
+            SpeakableInterface.super.greet(contact);
+    }
+
+    @Override
+    public void fly() {
+        System.out.println("I'm a Dragon and I'm flying.");
+    }
+
+    @Override
+    public int getMana() {
+        return this.mana;
+    }
+
+    @Override
+    public Collection<Spell> getSpells() {
+        return spells;
+    }
+
+    @Override
+    public void addSpell(Spell spell) {
+        if (spell.getSpellType() == SpellType.WATER)
+            System.out.println("Dragon cannot learn WATER spells.");
+        else if (!spells.contains(spell))
+        {
+            spells.add(spell);
+        }
+    }
+
+    @Override
+    public void castSpell(Spell spell) {
+        if (spell.getSpellType() == SpellType.WATER)
+            System.out.println("Dragon cannot learn WATER spells.");
+        else if (!spells.contains(spell))
+            System.out.println(this.name + " does not know " + spell.name() + ".");
+        else if (spell.getManaCost() > this.mana)
+            System.out.println(this.name + " does not have enough mana.");
+        else {
+            System.out.println(this.name + " casted " + spell.name() + ".");
+            this.mana -= spell.getManaCost();
+        }
+    }
+
+    @Override
+    public void regenMana(int mana) {
+        this.mana += mana;
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Fish.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Fish.java
new file mode 100644
index 0000000..b109493
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Fish.java
@@ -0,0 +1,27 @@
+package fr.epita.assistants.creatureInterface;
+
+public class Fish extends Creature implements SwimmingInterface{
+    /**
+     * Constructor for the Creature class.
+     *
+     * @param name The name of the creature
+     */
+    Fish(String name) {
+        super(name);
+    }
+
+    @Override
+    public void swim() {
+        System.out.println("I'm a " + this.getClass().getSimpleName() + " and I'm swimming.");
+    }
+
+    @Override
+    public boolean getSwimmingState() {
+        return true;
+    }
+
+    @Override
+    public void emerge() {
+        throw new RuntimeException(name + " died.");
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/FlyingInterface.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/FlyingInterface.java
new file mode 100644
index 0000000..49ab154
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/FlyingInterface.java
@@ -0,0 +1,12 @@
+package fr.epita.assistants.creatureInterface;
+
+/**
+ * This interface provides methods for flying.
+ * Creatures that fly implement this interface.
+ */
+public interface FlyingInterface {
+    /**
+     * Prints "I'm a {CreatureClassName} and I'm flying."
+     */
+    void fly();
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Human.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Human.java
new file mode 100644
index 0000000..b29b49f
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Human.java
@@ -0,0 +1,8 @@
+package fr.epita.assistants.creatureInterface;
+
+public class Human extends BaseHuman {
+    public Human(String name)
+    {
+        super(name);
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mage.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mage.java
new file mode 100644
index 0000000..dab7630
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mage.java
@@ -0,0 +1,59 @@
+package fr.epita.assistants.creatureInterface;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class Mage extends BaseHuman implements MagicalInterface{
+    int mana;
+    Collection<Spell> spells = new ArrayList<Spell>();
+    public Mage(String name, int mana) {
+        super(name);
+        this.mana = mana;
+    }
+
+    @Override
+    public void greet(SpeakableInterface contact)
+    {
+        if (contact instanceof Mage)
+            System.out.println("I welcome you, " + contact.getName() + ".");
+        else
+            super.greet(contact);
+    }
+
+    @Override
+    public int getMana() {
+        return this.mana;
+    }
+
+    @Override
+    public Collection<Spell> getSpells() {
+        return spells;
+    }
+
+    @Override
+    public void addSpell(Spell spell) {
+        if (!spells.contains(spell))
+        {
+            spells.add(spell);
+        }
+    }
+
+    @Override
+    public void castSpell(Spell spell) {
+        if (!spells.contains(spell))
+            System.out.println(this.name + " does not know " + spell.name() + ".");
+        else if (spell.getManaCost() > this.mana)
+            System.out.println(this.name + " does not have enough mana.");
+        else {
+            System.out.println(this.name + " casted " + spell.name() + ".");
+            this.mana -= spell.getManaCost();
+        }
+    }
+
+    @Override
+    public void regenMana(int mana) {
+        if (inWater)
+            mana = (int)(mana * 0.9);
+        this.mana += mana;
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/MagicalInterface.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/MagicalInterface.java
new file mode 100644
index 0000000..d7530ab
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/MagicalInterface.java
@@ -0,0 +1,56 @@
+package fr.epita.assistants.creatureInterface;
+
+import java.util.Collection;
+
+/**
+ * This interface provides methods for creatures that are Magical!
+ * Creatures that implement this interface have magical mana and spells.
+ */
+public interface MagicalInterface {
+    /**
+     * Get the mana of the creature.
+     *
+     * @return The mana of the creature
+     */
+    int getMana();
+
+    /**
+     * Get the spells of the creature.
+     *
+     * @return The spells of the creature
+     */
+    Collection<Spell> getSpells();
+
+    /**
+     * Add a spell to the creature.
+     * If the spell is already present, it will not be added.
+     * Be sure to check that the creature <strong>can</strong> learn the spell before adding it.
+     * Prints a message if the creature cannot learn the spell.
+     *
+     * @param spell The spell to add
+     */
+    void addSpell(Spell spell);
+
+    /**
+     * Cast a spell.
+     * If the creature knows the spell and has enough mana, the spell is cast.
+     * Otherwise, prints a message indicating the reason.
+     *
+     * @param spell The spell to cast
+     */
+    void castSpell(Spell spell);
+
+    /**
+     * Regenerate an amount of mana.
+     *
+     * @param mana The amount of mana to regenerate
+     */
+    void regenMana(int mana);
+
+    /**
+     * Do some sparkles ✨✨✨
+     */
+    default void doSomeSparkles() {
+        System.out.println("*sparkling effects*");
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mermaid.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mermaid.java
new file mode 100644
index 0000000..d086e8d
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Mermaid.java
@@ -0,0 +1,110 @@
+package fr.epita.assistants.creatureInterface;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class Mermaid extends Creature implements SpeakableInterface, MagicalInterface, SwimmingInterface {
+    int mana;
+    Collection<Spell> spells = new ArrayList<Spell>();
+    boolean swimmingState;
+
+    private String make_name(BaseHuman baseHuman, Fish fish) {
+        StringBuilder name = new StringBuilder();
+        name.append(baseHuman.getName().substring(0, 1).toUpperCase()).append(baseHuman.getName().substring(1).toLowerCase());
+        name.append(fish.getName().toLowerCase());
+        return new String(name);
+    }
+
+    public Mermaid(BaseHuman baseHuman, Fish fish)
+    {
+        super("");
+        this.name = make_name(baseHuman, fish);
+        if (baseHuman instanceof Mage)
+        {
+            for (Spell s : ((Mage) baseHuman).getSpells())
+            {
+                if (s.getSpellType() == SpellType.FIRE)
+                {
+                    System.out.println(this.name + " forgot the spell " + s.name() + ".");
+                }
+                else
+                {
+                    addSpell(s);
+                }
+            }
+        }
+        this.swimmingState = baseHuman.getSwimmingState();
+        this.mana = 0;
+    }
+
+    @Override
+    public void hello() {
+        System.out.println("Hello, my name is " + this.name + " and I'm a Mermaid.");
+    }
+
+    @Override
+    public void greet(SpeakableInterface contact) {
+        if (contact instanceof Mermaid)
+            System.out.println("Dear " + contact.getName() + ", welcome.");
+        else
+            SpeakableInterface.super.greet(contact);
+    }
+
+    @Override
+    public int getMana() {
+        return this.mana;
+    }
+
+    @Override
+    public Collection<Spell> getSpells() {
+        return spells;
+    }
+
+    @Override
+    public void addSpell(Spell spell) {
+        if (spell.getSpellType() == SpellType.FIRE)
+            System.out.println("Mermaid cannot learn FIRE spells.");
+        else if (!spells.contains(spell)) {
+            spells.add(spell);
+        }
+    }
+
+    @Override
+    public void castSpell(Spell spell) {
+        if (spell.getSpellType() == SpellType.FIRE)
+            System.out.println("Mermaid cannot learn FIRE spells.");
+        else if (!spells.contains(spell))
+            System.out.println(this.name + " does not know " + spell.name() + ".");
+        else if (spell.getSpellType() == SpellType.WATER && swimmingState && spell.getManaCost() * 0.6 <= this.mana) {
+            this.mana -= (int) (spell.getManaCost() * 0.6);
+            System.out.println(this.name + " casted " + spell.name() + ".");
+        } else if (spell.getManaCost() > this.mana)
+            System.out.println(this.name + " does not have enough mana.");
+        else {
+            System.out.println(this.name + " casted " + spell.name() + ".");
+            this.mana -= spell.getManaCost();
+        }
+    }
+
+    @Override
+    public void regenMana(int mana) {
+        this.mana += mana;
+    }
+
+    @Override
+    public void swim() {
+        swimmingState = true;
+        System.out.println("I'm a Mermaid and I'm swimming.");
+    }
+
+    @Override
+    public boolean getSwimmingState() {
+        return swimmingState;
+    }
+
+    @Override
+    public void emerge() {
+        swimmingState = false;
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpeakableInterface.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpeakableInterface.java
new file mode 100644
index 0000000..cc10988
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpeakableInterface.java
@@ -0,0 +1,47 @@
+package fr.epita.assistants.creatureInterface;
+
+import java.util.List;
+
+/**
+ * This interface provides communication methods for the objects of the class
+ * that implements it. Classes adopting this interface instantiate objects
+ * capable of communication.
+ */
+public interface SpeakableInterface {
+    /**
+     * Returns the name of the object that can speak
+     */
+    String getName();
+
+    /**
+     * Prints "Hello, my name is {creatureName} and I'm a {creatureClassName}."
+     */
+    void hello();
+
+    /**
+     * Greets the contact
+     * The default implementation greets the contact based on its type
+     * @param contact the creature to greet
+     */
+    default void greet(SpeakableInterface contact) {
+        if (contact instanceof Mage)
+            System.out.println("Salutations " + contact.getName() + ", keeper of Arcane secrets.");
+        else if (contact instanceof Human)
+            System.out.println("Salutations " + contact.getName() + " the human.");
+        else if (contact instanceof Dragon)
+            System.out.println("Salutations " + contact.getName() + ", keeper of Ancient treasures.");
+        else if (contact instanceof Mermaid)
+            System.out.println("Salutations " + contact.getName() + ", keeper of the Seas.");
+    }
+
+
+    /**
+     * Allows all speakers in the collection to say hello as explained in the hello() method
+     * @param speakers the list of creatures that can speak
+     */
+    static void helloAll(List<SpeakableInterface> speakers) {
+        for (SpeakableInterface speaker : speakers) {
+            speaker.hello();
+        }
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Spell.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Spell.java
new file mode 100644
index 0000000..87fe68a
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/Spell.java
@@ -0,0 +1,48 @@
+package fr.epita.assistants.creatureInterface;
+
+/**
+ * This enum represents a spell that some creature can cast.
+ * Refer to the subject for more information about enum with behavior.
+ */
+public enum Spell {
+    FIREBALL(40, SpellType.FIRE, "Launches a sphere of fire that explodes upon impact."),
+    HEAL(30, SpellType.NEUTRAL, "Channels divine energy to restore health."),
+    MAGIC_SHIELD(15, SpellType.NEUTRAL, "Summons an arcane shield that reflects attacks."),
+    TIDAL_WAVE(30, SpellType.WATER, "Summons a huge wave of water that crashes down dealing damage.");
+
+    /**
+     * The cost of the spell in mana.
+     */
+    private final int manaCost;
+
+    /**
+     * The type of the spell.
+     */
+    private final SpellType spellType;
+
+    /**
+     * The description of the spell.
+     */
+    private final String description;
+
+    Spell(int manaCost, SpellType spellType, String description) {
+        this.manaCost = manaCost;
+        this.spellType = spellType;
+        this.description = description;
+    }
+
+    public int getManaCost() {
+        return manaCost;
+    }
+
+    public SpellType getSpellType() {
+        return spellType;
+    }
+
+    /**
+     * This method prints a description of the spell and its mana cost.
+     */
+    public void what() {
+        System.out.println(this.description + "\tUses " + getManaCost() + " mana.");
+    }
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpellType.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpellType.java
new file mode 100644
index 0000000..53cca2a
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SpellType.java
@@ -0,0 +1,11 @@
+package fr.epita.assistants.creatureInterface;
+
+/**
+ * This enumeration provides the types of spells.
+ * Do not forget that creatures have restrictions on the types of spells they can learn.
+ */
+public enum SpellType {
+    FIRE,
+    WATER,
+    NEUTRAL,
+}
diff --git a/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SwimmingInterface.java b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SwimmingInterface.java
new file mode 100644
index 0000000..ede4d31
--- /dev/null
+++ b/graphs/java/creatureInterface/src/main/java/fr/epita/assistants/creatureInterface/SwimmingInterface.java
@@ -0,0 +1,25 @@
+package fr.epita.assistants.creatureInterface;
+
+/**
+ * This interface provides methods for swimming.
+ * Creatures that swim implement this interface.
+ */
+public interface SwimmingInterface {
+    /**
+     * Prints "I'm a {CreatureClassName} and I'm swimming."
+     */
+    void swim();
+
+    /**
+     * Returns true if the creature is swimming.
+     * It is up to the implementing class to determine the conditions for swimming.
+     *
+     * @return True if the creature is swimming
+     */
+    boolean getSwimmingState();
+
+    /**
+     * Emerges from the water.
+     */
+    void emerge();
+}
diff --git a/graphs/java/drawing/.gitignore b/graphs/java/drawing/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/drawing/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/drawing/pom.xml b/graphs/java/drawing/pom.xml
new file mode 100644
index 0000000..24df903
--- /dev/null
+++ b/graphs/java/drawing/pom.xml
@@ -0,0 +1,139 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>drawing</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>2.22.2</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Circle.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Circle.java
new file mode 100644
index 0000000..306d870
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Circle.java
@@ -0,0 +1,27 @@
+package fr.epita.assistants.drawing;
+
+public class Circle extends Entity {
+    private int radius;
+
+    public Circle(int radius) {
+        super();
+        this.radius = radius;
+    }
+
+    @Override
+    public void draw() {
+        for (int y = -radius; y < radius + 1; y++) {
+            for (int x = -radius; x < radius + 1; x++) {
+                if (Math.abs((radius * radius) - ((x * x) + (y * y))) < radius) {
+                    System.out.print('#');
+                }
+                else
+                    System.out.print(' ');
+                if (x < radius)
+                    System.out.print(' ');
+            }
+            if (y < radius)
+                System.out.print("\n");
+        }
+    }
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Entity.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Entity.java
new file mode 100644
index 0000000..a91aa0f
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Entity.java
@@ -0,0 +1,20 @@
+package fr.epita.assistants.drawing;
+
+import lombok.Getter;
+
+public abstract class Entity implements IDrawable {
+    @Getter
+    private long id;
+    private static long SEQUENCE = 0;
+
+    public Entity() {
+        this.id = SEQUENCE;
+        SEQUENCE++;
+    }
+
+    @Override
+    public void draw() {
+        System.out.println("This shouldn't happen");
+    }
+
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/IDrawable.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/IDrawable.java
new file mode 100644
index 0000000..2af2df1
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/IDrawable.java
@@ -0,0 +1,5 @@
+package fr.epita.assistants.drawing;
+
+public interface IDrawable {
+    public void draw();
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Rectangle.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Rectangle.java
new file mode 100644
index 0000000..944a75b
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Rectangle.java
@@ -0,0 +1,31 @@
+package fr.epita.assistants.drawing;
+
+public class Rectangle extends Sharp {
+    private int width;
+
+    public Rectangle(int width, int length) {
+        super(length);
+        this.width = width;
+    }
+
+    @Override
+    public void draw() {
+        for (int i = 0; i < width; i++) {
+            System.out.print("# ");
+        }
+        System.out.print("\n");
+        for (int i = 0; i < length - 2; i++) {
+            System.out.print("# ");
+            for (int j = 0; j < width - 2; j++) {
+                System.out.print("  ");
+            }
+            System.out.println("# ");
+        }
+        if (length < 2)
+            return;
+        for (int i = 0; i < width; i++) {
+            System.out.print("# ");
+        }
+        System.out.print("\n");
+    }
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Sharp.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Sharp.java
new file mode 100644
index 0000000..604f255
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Sharp.java
@@ -0,0 +1,9 @@
+package fr.epita.assistants.drawing;
+
+public abstract class Sharp extends Entity {
+    protected int length;
+    public Sharp(int length) {
+        super();
+        this.length = length;
+    }
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Square.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Square.java
new file mode 100644
index 0000000..d807bcc
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Square.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.drawing;
+
+public class Square extends Rectangle {
+    public Square(int length) {
+        super(length, length);
+    }
+}
diff --git a/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Triangle.java b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Triangle.java
new file mode 100644
index 0000000..a43248c
--- /dev/null
+++ b/graphs/java/drawing/src/main/java/fr/epita/assistants/drawing/Triangle.java
@@ -0,0 +1,33 @@
+package fr.epita.assistants.drawing;
+
+public class Triangle extends Sharp {
+    public Triangle(int length) {
+        super(length);
+    }
+
+    @Override
+    public void draw() {
+        if (length == 0)
+            return;
+        if (length == 2)
+        {
+            System.out.println("#\n# #");
+            return;
+        }
+        System.out.println('#');
+        for (int y = 2; y < length; y++) {
+            System.out.print("# ");
+            for (int x = 0; x < y - 2; x++) {
+                System.out.print("  ");
+            }
+            System.out.println("#");
+        }
+        if (length > 2)
+        {
+            for (int i = 0; i < length; i++) {
+                System.out.print("# ");
+            }
+        }
+        System.out.print("\n");
+    }
+}
diff --git a/graphs/java/embedFiles/.gitignore b/graphs/java/embedFiles/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/embedFiles/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/embedFiles/pom.xml b/graphs/java/embedFiles/pom.xml
new file mode 100644
index 0000000..399dd7d
--- /dev/null
+++ b/graphs/java/embedFiles/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>embedFiles</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/embedFiles/src/main/java/fr/epita/assistants/embedfiles/DisplayEmbedFile.java b/graphs/java/embedFiles/src/main/java/fr/epita/assistants/embedfiles/DisplayEmbedFile.java
new file mode 100644
index 0000000..2dbd4b8
--- /dev/null
+++ b/graphs/java/embedFiles/src/main/java/fr/epita/assistants/embedfiles/DisplayEmbedFile.java
@@ -0,0 +1,27 @@
+package fr.epita.assistants.embedfiles;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
+
+public class DisplayEmbedFile {
+    private final String filename;
+
+    public DisplayEmbedFile(String filename) {
+        this.filename = filename;
+    }
+
+    public Optional<String> display() {
+        Optional<String> res = Optional.empty();
+        InputStream in = ClassLoader.getSystemResourceAsStream(filename);
+        if (in != null) {
+            try {
+                res = Optional.of(new String(in.readAllBytes(), StandardCharsets.UTF_8));
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return res;
+    }
+}
diff --git a/graphs/java/embedFiles/src/main/resources/other-sample.txt b/graphs/java/embedFiles/src/main/resources/other-sample.txt
new file mode 100644
index 0000000..7631d8a
--- /dev/null
+++ b/graphs/java/embedFiles/src/main/resources/other-sample.txt
@@ -0,0 +1,539 @@
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diff --git a/graphs/java/embedFiles/src/main/resources/sample.txt b/graphs/java/embedFiles/src/main/resources/sample.txt
new file mode 100644
index 0000000..f1811f5
--- /dev/null
+++ b/graphs/java/embedFiles/src/main/resources/sample.txt
@@ -0,0 +1 @@
+This is a sample
\ No newline at end of file
diff --git a/graphs/java/fgen/.gitignore b/graphs/java/fgen/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/fgen/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/fgen/pom.xml b/graphs/java/fgen/pom.xml
new file mode 100644
index 0000000..d227bcc
--- /dev/null
+++ b/graphs/java/fgen/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>fgen</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/fgen/src/main/java/fr/epita/assistants/fgen/FGen.java b/graphs/java/fgen/src/main/java/fr/epita/assistants/fgen/FGen.java
new file mode 100644
index 0000000..5f5a470
--- /dev/null
+++ b/graphs/java/fgen/src/main/java/fr/epita/assistants/fgen/FGen.java
@@ -0,0 +1,105 @@
+package fr.epita.assistants.fgen;
+
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Comparator;
+import java.util.stream.Stream;
+
+public class FGen {
+    private Path cwd;
+
+    public FGen(final String inputPath) {
+        this.cwd = Paths.get(new File("").getAbsolutePath());
+        try (InputStream in = ClassLoader.getSystemResourceAsStream(inputPath)) {
+            BufferedReader br = new BufferedReader(new InputStreamReader(in));
+            String line;
+            while ((line = br.readLine()) != null) {
+                execute(line);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void execute(String l) {
+        String[] args = l.split("\\s+");
+        switch (args[0]) {
+            case "+":
+                create(args[1]);
+                break;
+            case "-":
+                delete(args[1]);
+                break;
+            case ">":
+                ceedee(args[1]);
+                break;
+        }
+    }
+
+    private void create(String pathName) {
+        Path path = cwd.resolve(pathName);
+        File f = new File(String.valueOf(path));
+        if (pathName.endsWith("/")) {
+            if (!f.exists()) {
+                if (!f.mkdirs())
+                {
+                    throw new RuntimeException("Could not create directories");
+                }
+            }
+        } else {
+            if (!f.exists()) {
+                try {
+                    if (pathName.contains("/"))
+                    {
+                        String tmp = cwd.toString() + "/" + pathName.substring(0, pathName.lastIndexOf('/'));
+                        if (!new File(tmp).exists())
+                        {
+                            if (!new File(tmp).mkdirs())
+                                throw new RuntimeException("create(file): Could not create dirs");
+                        }
+                    }
+
+                    if (!f.createNewFile())
+                        throw new RuntimeException("Could not create file");
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+    }
+
+    private void ceedee(String pathName) {
+        Path res_path = cwd.resolve(pathName);
+        if (Files.exists(res_path) && Files.isDirectory(res_path)) {
+            cwd = res_path;
+        }
+        else throw new RuntimeException("Invalid path provided to cd");
+    }
+    private boolean deleteDirectory (File file){
+        File[] contents = file.listFiles();
+        if (contents != null) {
+            for (File f : contents) {
+                deleteDirectory(f);
+            }
+        }
+        return file.delete();
+    }
+
+    private void delete(String pathString) {
+        Path path = cwd.resolve(pathString);
+        File file = new File(String.valueOf(path));
+        if (Files.isDirectory(path)) {
+            if (!deleteDirectory(file))
+                throw new RuntimeException("Unable to delete dir");
+        } else {
+            try {
+                if (!Files.deleteIfExists(path))
+                    return;
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/fgen/src/main/resources/example.txt b/graphs/java/fgen/src/main/resources/example.txt
new file mode 100644
index 0000000..f864008
--- /dev/null
+++ b/graphs/java/fgen/src/main/resources/example.txt
@@ -0,0 +1,3 @@
++ hello/dossier
+> hello
+- dossier
\ No newline at end of file
diff --git a/graphs/java/grades/.gitignore b/graphs/java/grades/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/grades/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/grades/pom.xml b/graphs/java/grades/pom.xml
new file mode 100644
index 0000000..f48839f
--- /dev/null
+++ b/graphs/java/grades/pom.xml
@@ -0,0 +1,139 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>grades</artifactId>
+    <version>1.1</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>2.22.2</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/EntryNotFoundException.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/EntryNotFoundException.java
new file mode 100644
index 0000000..fa9d24e
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/EntryNotFoundException.java
@@ -0,0 +1,13 @@
+package fr.epita.assistants.grades;
+
+public class EntryNotFoundException extends RuntimeException {
+    /**
+     * @param entryClass The class of the collection's entries
+     * @param query      The string representation of the search query
+     */
+    public EntryNotFoundException(Class<?> entryClass, String query) {
+        super(String.format("%s not found for: `%s`",
+                            entryClass.getSimpleName(),
+                            query));
+    }
+}
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/GradeHandler.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/GradeHandler.java
new file mode 100644
index 0000000..91da40b
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/GradeHandler.java
@@ -0,0 +1,98 @@
+package fr.epita.assistants.grades;
+
+import fr.epita.assistants.grades.model.*;
+
+import java.util.*;
+import java.util.function.*;
+import java.util.stream.*;
+
+public class GradeHandler {
+    private final List<Activity> activities;
+    private final List<Student> students;
+
+    public GradeHandler() {
+        this.activities = new ArrayList<>();
+        this.students = new ArrayList<>();
+    }
+
+    /**
+     * @param activity The {@link Activity} to be added
+     * @return {@code true} (as specified by {@link List#add})
+     */
+    public boolean addActivity(Activity activity) {
+        this.activities.add(activity);
+        return true;
+    }
+
+    /**
+     * @param student The {@link Student} to be added
+     * @return {@code true} (as specified by {@link List#add})
+     */
+    public boolean addStudent(Student student) {
+        students.add(student);
+        return true;
+    }
+
+    /**
+     * @param name The name of the desired {@link Student}
+     * @return The desired student
+     * @throws EntryNotFoundException No known {@link Student} with the given name
+     */
+    public Student getStudent(String name) throws EntryNotFoundException {
+        Optional<Student> o = students.stream().filter(i -> i.name().equals(name)).findFirst();
+        if (o.isEmpty())
+            throw new EntryNotFoundException(Student.class, name);
+        else
+            return o.get();
+    }
+
+    /**
+     * @param grade The {@link Grade} to be added to the {@link Student}
+     * @param name  The name of the desired {@link Student}
+     * @return {@code true} (as specified by {@link List#add})
+     * @throws EntryNotFoundException No known {@link Student} with the given name
+     */
+    public boolean addGradeToStudent(Grade grade, String name) throws EntryNotFoundException {
+        getStudent(name).grades().add(grade);
+        return true;
+    }
+
+    /**
+     * @param name The name of the desired {@link Student} to remove
+     * @return The removed {@link Student}
+     * @throws EntryNotFoundException No known {@link Student} with the given name
+     */
+    public Student removeStudent(String name) throws EntryNotFoundException {
+        Student s = getStudent(name);
+        students.remove(getStudent(name));
+        return s;
+    }
+
+    /**
+     * @param name     The name of the desired {@link Student}
+     * @param function A {@link Function} returning an updated {@link Student} from the given one
+     * @throws EntryNotFoundException No known {@link Student} with the given name
+     */
+    public void updateStudent(String name, Function<Student, Student> function) throws EntryNotFoundException {
+        addStudent(function.apply(removeStudent(name)));
+    }
+
+    /**
+     * @param name    The name of the {@link Student} from which to get grades
+     * @param subject The {@link Subject} from which we want the student's average
+     * @return The student's average grade in the specified subject (0 if no grades are available)
+     * @throws EntryNotFoundException No known {@link Student} with the given name
+     */
+    public double getStudentAverageInSubject(String name, Subject subject) throws EntryNotFoundException {
+        Optional<Student> o = students.stream().filter(i -> i.name().equals(name)).findFirst();
+        if (o.isPresent()) {
+            Student s = o.get();
+            OptionalDouble d = s.grades().stream().filter(g -> g.activity().subject() == subject).mapToDouble(Grade::grade).average();
+            if (d.isEmpty())
+                return 0.0;
+            else return d.getAsDouble();
+        }
+        else
+            throw new EntryNotFoundException(getClass(), name);
+    }
+}
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Activity.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Activity.java
new file mode 100644
index 0000000..fe3e285
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Activity.java
@@ -0,0 +1,4 @@
+package fr.epita.assistants.grades.model;
+
+public record Activity(String name, Subject subject, float weight) {
+}
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Grade.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Grade.java
new file mode 100644
index 0000000..fb63a6c
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Grade.java
@@ -0,0 +1,4 @@
+package fr.epita.assistants.grades.model;
+
+public record Grade(Activity activity, int grade) {
+}
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Student.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Student.java
new file mode 100644
index 0000000..335e073
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Student.java
@@ -0,0 +1,8 @@
+package fr.epita.assistants.grades.model;
+
+import lombok.Builder;
+
+import java.util.List;
+
+@Builder
+public record Student(String name, int age, List<Grade> grades) {}
diff --git a/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Subject.java b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Subject.java
new file mode 100644
index 0000000..00bc685
--- /dev/null
+++ b/graphs/java/grades/src/main/java/fr/epita/assistants/grades/model/Subject.java
@@ -0,0 +1,8 @@
+package fr.epita.assistants.grades.model;
+
+public enum Subject {
+    STEMS,
+    SHAPE,
+    HEAL,
+    Maths;
+}
diff --git a/graphs/java/helloWorld/pom.xml b/graphs/java/helloWorld/pom.xml
new file mode 100644
index 0000000..afbe2f5
--- /dev/null
+++ b/graphs/java/helloWorld/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>helloWorld</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/helloWorld/src/main/java/fr/epita/assistants/helloworld/HelloWorld.java b/graphs/java/helloWorld/src/main/java/fr/epita/assistants/helloworld/HelloWorld.java
new file mode 100644
index 0000000..b30d8a5
--- /dev/null
+++ b/graphs/java/helloWorld/src/main/java/fr/epita/assistants/helloworld/HelloWorld.java
@@ -0,0 +1,12 @@
+package fr.epita.assistants.helloworld;
+
+public class HelloWorld {
+    public void printHelloWorld()
+    {
+        System.out.print("Hello World!");
+    }
+    public void printHelloWorldErr()
+    {
+        System.err.println("Hello World!");
+    }
+}
diff --git a/graphs/java/linkedList/.gitignore b/graphs/java/linkedList/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/linkedList/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/linkedList/pom.xml b/graphs/java/linkedList/pom.xml
new file mode 100644
index 0000000..e1a9950
--- /dev/null
+++ b/graphs/java/linkedList/pom.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>linkedList</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>
\ No newline at end of file
diff --git a/graphs/java/linkedList/src/main/java/fr/epita/assistants/linkedlist/LinkedList.java b/graphs/java/linkedList/src/main/java/fr/epita/assistants/linkedlist/LinkedList.java
new file mode 100644
index 0000000..c54f0f4
--- /dev/null
+++ b/graphs/java/linkedList/src/main/java/fr/epita/assistants/linkedlist/LinkedList.java
@@ -0,0 +1,99 @@
+package fr.epita.assistants.linkedlist;
+
+public class LinkedList<T extends Comparable<T>> {
+    static public class ListElement<T> {
+        T value;
+        ListElement<T> next;
+
+        public ListElement(T value) {
+            this.value = value;
+            this.next = null;
+        }
+    }
+
+    /**
+     * Initializes the list
+     **/
+    public ListElement<T> head;
+    public int size;
+    public LinkedList() {
+        this.head = new ListElement<T>(null);
+        this.size = 0;
+    }
+
+    /**
+     * Inserts the specified element into the list.
+     * The elements must be sorted in ascending order.
+     * null elements should be at the end of the list.
+     *
+     * @param e Element to be inserted
+     **/
+    public void insert(T e) {
+        ListElement<T> h = this.head;
+        while ((h.next != null) && (h.next.value.compareTo(e) < 0))
+            h = h.next;
+
+        if (h.next == null)
+            h.next = new ListElement<T>(e);
+        else
+        {
+            ListElement<T> tmp = h.next;
+            h.next = new ListElement<>(e);
+            h.next.next = tmp;
+        }
+        this.size++;
+    }
+
+    /**
+     * Returns the n-th element in the list.
+     *
+     * @param i Index
+     * @return The element at the given index
+     * @throws IndexOutOfBoundsException if there is no element at this
+     *                                   index.
+     **/
+    public T get(int i) {
+        if (i >= this.size || i < 0)
+            throw new IndexOutOfBoundsException();
+        ListElement<T> h = this.head;
+        while(i-- != 0)
+            h = h.next;
+        return h.next.value;
+    }
+
+    /**
+     * Removes the first occurrence of the specified element in the list.
+     *
+     * @param e Element to remove
+     * @return returns the element that has been removed or null
+     **/
+    public T remove(T e) {
+        ListElement<T> h = this.head;
+        while ((h.next != null) && (h.next.value.compareTo(e) != 0))
+            h = h.next;
+        if (h.next == null)
+            return null;
+        ListElement<T> res = h.next;
+        h.next = h.next.next;
+        res.next = null;
+        this.size--;
+        return res.value;
+    }
+
+    /**
+     * Returns the size of the list.
+     *
+     * @return Number of elements in the list
+     **/
+    public int size() {
+        return this.size;
+    }
+
+    /**
+     * Removes all elements from the list.
+     **/
+    public void clear() {
+        this.head.next = null;
+        this.size = 0;
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/linkedList/src/test/java/fr/epita/assistants/linkedlist/LinkedListTests.java b/graphs/java/linkedList/src/test/java/fr/epita/assistants/linkedlist/LinkedListTests.java
new file mode 100644
index 0000000..58ee1b1
--- /dev/null
+++ b/graphs/java/linkedList/src/test/java/fr/epita/assistants/linkedlist/LinkedListTests.java
@@ -0,0 +1,38 @@
+package fr.epita.assistants.linkedlist;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class LinkedListTests {
+    @Test
+    @Timeout(value = 10, threadMode = Timeout.ThreadMode.SEPARATE_THREAD)
+    public void testInsertOne() {
+        LinkedList<Integer> list = new LinkedList<>();
+        list.insert(12);
+        assertEquals(Integer.valueOf(12), list.get(0), "Invalid element");
+    }
+
+    @Test
+    @Timeout(value = 10, threadMode = Timeout.ThreadMode.SEPARATE_THREAD)
+    public void testGetFail() {
+        LinkedList<Integer> list = new LinkedList<>();
+        list.insert(3);
+        list.insert(5);
+        list.insert(2);
+        assertThrows(IndexOutOfBoundsException.class, () -> list.get(4));
+    }
+
+    @Test
+    @Timeout(value = 10, threadMode = Timeout.ThreadMode.SEPARATE_THREAD)
+    public void testRemoveNotPresent() {
+        LinkedList<Integer> list = new LinkedList<>();
+        list.insert(1);
+        list.insert(2);
+        list.insert(3);
+        list.insert(4);
+        assertNull(list.remove(12), "Invalid return value of remove()");
+    }
+    // add your own tests here
+}
diff --git a/graphs/java/loggingBasics/.gitignore b/graphs/java/loggingBasics/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/loggingBasics/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/loggingBasics/pom.xml b/graphs/java/loggingBasics/pom.xml
new file mode 100644
index 0000000..9728beb
--- /dev/null
+++ b/graphs/java/loggingBasics/pom.xml
@@ -0,0 +1,146 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<modelVersion>4.0.0</modelVersion>
+<groupId>fr.epita.assistants</groupId>
+<artifactId>loggingBasics</artifactId>
+<version>1.0</version>
+
+<properties>
+    <versions.java>21</versions.java>
+    <versions.junit>5.9.1</versions.junit>
+    <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+    <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+    <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+    <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+    <logback-classic.version>1.4.5</logback-classic.version>
+    <slf4j-api.version>2.0.5</slf4j-api.version>
+
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+    <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+</properties>
+
+<dependencies>
+    <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter</artifactId>
+        <version>${versions.junit}</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven.surefire</groupId>
+        <artifactId>surefire-junit-platform</artifactId>
+        <version>${versions.maven-surefire-plugin}</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-compat</artifactId>
+        <version>3.9.8</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-plugin-api</artifactId>
+        <version>3.9.8</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-project</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-core</artifactId>
+        <version>3.8.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-monitor</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-utils</artifactId>
+        <version>3.0.24</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven.shared</groupId>
+        <artifactId>maven-filtering</artifactId>
+        <version>3.3.2</version>
+    </dependency>
+    <dependency>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-interpolation</artifactId>
+        <version>1.13</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-profile</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-artifact-manager</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-plugin-registry</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.apache.maven</groupId>
+        <artifactId>maven-repository-metadata</artifactId>
+        <version>2.2.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-api</artifactId>
+        <version>${slf4j-api.version}</version>
+    </dependency>
+    <dependency>
+        <groupId>ch.qos.logback</groupId>
+        <artifactId>logback-classic</artifactId>
+        <version>${logback-classic.version}</version>
+    </dependency>
+    <dependency>
+        <groupId>classworlds</groupId>
+        <artifactId>classworlds</artifactId>
+        <version>1.1</version>
+    </dependency>
+    <dependency>
+        <groupId>org.junit.platform</groupId>
+        <artifactId>junit-platform-commons</artifactId>
+        <version>1.9.3</version>
+    </dependency>
+</dependencies>
+
+<build>
+    <plugins>
+        <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <version>${versions.maven-compiler-plugin}</version>
+            <configuration>
+                <source>${versions.java}</source>
+                <target>${versions.java}</target>
+            </configuration>
+        </plugin>
+        <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-install-plugin</artifactId>
+            <version>${versions.maven-install-plugin}</version>
+        </plugin>
+
+        <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+            <configuration>
+                <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+            </configuration>
+        </plugin>
+    </plugins>
+</build>
+</project>
diff --git a/graphs/java/loggingBasics/src/main/java/fr/epita/assistants/loggingbasics/Trombinoscope.java b/graphs/java/loggingBasics/src/main/java/fr/epita/assistants/loggingbasics/Trombinoscope.java
new file mode 100644
index 0000000..2607802
--- /dev/null
+++ b/graphs/java/loggingBasics/src/main/java/fr/epita/assistants/loggingbasics/Trombinoscope.java
@@ -0,0 +1,43 @@
+package fr.epita.assistants.loggingbasics;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import fr.epita.assistants.Main;
+import org.slf4j.LoggerFactory;
+
+import java.util.*;
+
+public class Trombinoscope {
+    private final Logger LOGGER;
+    private final HashMap<String, Long> map;
+
+    public Trombinoscope() {
+        // FIXME: Instantiate logger with level TRACE
+        LOGGER = (Logger) LoggerFactory.getLogger(Trombinoscope.class);
+        LOGGER.setLevel(Level.TRACE);
+
+        // FIXME: Add logging here
+        LOGGER.trace("Instantiating new Trombinoscope");
+
+        map = new HashMap<>();
+    }
+
+    public Long putPerson(String name, long photoId) {
+        // FIXME: Add logging here
+        LOGGER.setLevel(Level.DEBUG);
+        LOGGER.debug("Putting person (\"" + name + "\", " + photoId + ")");
+
+        Long oldPhotoId = map.put(name,
+                                  photoId);
+
+        // FIXME: Add logging here
+
+        LOGGER.setLevel(Level.TRACE);
+        if (oldPhotoId == null)
+            LOGGER.trace("Added entry for person \"" + name + "\"");
+        else
+            LOGGER.trace("Updated entry for person \"" + name + "\"");
+
+        return oldPhotoId;
+    }
+}
diff --git a/graphs/java/myKitten/.gitignore b/graphs/java/myKitten/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/myKitten/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/myKitten/assembly.xml b/graphs/java/myKitten/assembly.xml
new file mode 100644
index 0000000..4a8c128
--- /dev/null
+++ b/graphs/java/myKitten/assembly.xml
@@ -0,0 +1,20 @@
+
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
+    <id>tests</id>
+    <formats>
+        <format>jar</format>
+    </formats>
+    <includeBaseDirectory>false</includeBaseDirectory>
+    <dependencySets>
+        <dependencySet>
+            <outputDirectory>/</outputDirectory>
+            <useProjectArtifact>true</useProjectArtifact>
+            <!-- we're creating the test-jar as an attachement -->
+            <useProjectAttachments>true</useProjectAttachments>
+            <unpack>true</unpack>
+            <scope>test</scope>
+        </dependencySet>
+    </dependencySets>
+</assembly>
\ No newline at end of file
diff --git a/graphs/java/myKitten/pom.xml b/graphs/java/myKitten/pom.xml
new file mode 100644
index 0000000..e74e346
--- /dev/null
+++ b/graphs/java/myKitten/pom.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>myKitten</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>3.29.2-GA</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/myKitten/src/main/java/fr/epita/assistants/mykitten/MyKitten.java b/graphs/java/myKitten/src/main/java/fr/epita/assistants/mykitten/MyKitten.java
new file mode 100644
index 0000000..e63c2f7
--- /dev/null
+++ b/graphs/java/myKitten/src/main/java/fr/epita/assistants/mykitten/MyKitten.java
@@ -0,0 +1,64 @@
+package fr.epita.assistants.mykitten;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+public class MyKitten {
+    /**
+     * Initializer.
+     *
+     * @param srcPath Source file path.
+     */
+    public MyKitten(String srcPath) {
+        try {
+            this.streamContent = Files.lines(Paths.get(srcPath));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Use the streamContent to replace `wordToReplace` with "miaou". Don't forget
+     * to add the line number beforehand for each line. Store the new
+     * result directly in the streamContent field.
+     *
+     * @param wordToReplace The word to replace
+     */
+    public void replaceByMiaou(String wordToReplace) {
+        final int[] line = {1};
+        this.streamContent = this.streamContent.map(i -> line[0]++ + " " + i).map(i -> i.replace(wordToReplace, "miaou"));
+    }
+
+    /**
+     * Use the streamContent to write the content into the destination file.
+     *
+     * @param destPath Destination file path.
+     */
+    public void toFile(String destPath) {
+        try {
+            Files.write(Paths.get(destPath), this.streamContent.toList(), StandardCharsets.UTF_8);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Creates an instance of MyKitten and calls the above methods to do it
+     * straightforwardly.
+     *
+     * @param srcPath       Source file path
+     * @param destPath      Destination file path
+     * @param wordToReplace Word to replace
+     */
+    public static void miaou(String srcPath, String destPath,
+                             String wordToReplace) {
+        MyKitten chatteDeTaDaronne = new MyKitten(srcPath);
+        chatteDeTaDaronne.replaceByMiaou(wordToReplace);
+        chatteDeTaDaronne.toFile(destPath);
+    }
+
+    public Stream<String> streamContent;
+}
diff --git a/graphs/java/mySet/.gitignore b/graphs/java/mySet/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/mySet/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/mySet/pom.xml b/graphs/java/mySet/pom.xml
new file mode 100644
index 0000000..c20e039
--- /dev/null
+++ b/graphs/java/mySet/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>mySet</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/GenericSet.java b/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/GenericSet.java
new file mode 100644
index 0000000..590751f
--- /dev/null
+++ b/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/GenericSet.java
@@ -0,0 +1,83 @@
+package fr.epita.assistants.myset;
+
+import java.util.ArrayList;
+
+public class GenericSet<T extends Comparable<T>> {
+    ArrayList<T> base_;
+
+    public GenericSet() {
+        base_ = new ArrayList<>();
+    }
+
+    private static <T extends Comparable<T>> void insertionSort(ArrayList<T> array) {
+        if (array.isEmpty()) {
+            return;
+        }
+        for (int i = 1; i < array.size(); i++) {
+            for (int j = i; j > 0 && array.get(j - 1).compareTo(array.get(j)) > 0; j--) {
+                T tmp = array.get(j);
+                array.set(j, array.get(j - 1));
+                array.set(j - 1, tmp);
+            }
+        }
+    }
+    public void insert(T i) {
+        if (!this.has(i)) {
+            this.base_.add(i);
+            insertionSort(base_);
+        }
+    }
+
+    public void remove(T i) {
+        this.base_.remove(i);
+    }
+
+    public boolean has(T i) {
+        return this.base_.contains(i);
+    }
+
+    public boolean isEmpty() {
+        return this.base_.isEmpty();
+    }
+
+    public T min() {
+        T min = base_.getFirst();
+        for (T t : base_) {
+            if (t.compareTo(min) < 0)
+                min = t;
+        }
+        return min;
+    }
+
+    public T max() {
+        T max = base_.getFirst();
+        for (T t : base_) {
+            if (t.compareTo(max) > 0)
+                max = t;
+        }
+        return max;
+    }
+
+    public int size() {
+        return base_.size();
+    }
+
+    public static <T extends Comparable<T>> GenericSet<T> intersection(GenericSet<T> a, GenericSet<T> b) {
+        GenericSet<T> res = new GenericSet<T>();
+        for (int i = 0; i < a.size(); i++) {
+            if (b.has(a.base_.get(i)))
+                res.insert(a.base_.get(i));
+        }
+        return res;
+    }
+
+    public static <T extends Comparable<T>> GenericSet<T> union(GenericSet<T> a, GenericSet<T> b) {
+        GenericSet<T> res = new GenericSet<>();
+        for (T i : a.base_)
+            res.insert(i);
+        for (T i : b.base_)
+            res.insert(i);
+
+        return res;
+    }
+}
diff --git a/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/IntegerSet.java b/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/IntegerSet.java
new file mode 100644
index 0000000..25dcfdc
--- /dev/null
+++ b/graphs/java/mySet/src/main/java/fr/epita/assistants/myset/IntegerSet.java
@@ -0,0 +1,83 @@
+package fr.epita.assistants.myset;
+
+import java.util.ArrayList;
+
+public class IntegerSet {
+    ArrayList<Integer> base_;
+
+    public IntegerSet() {
+        base_ = new ArrayList<Integer>();
+    }
+
+    private static void insertionSort(ArrayList<Integer> array) {
+        if (array.isEmpty()) {
+            return;
+        }
+        for (int i = 1; i < array.size(); i++) {
+            for (int j = i; j > 0 && array.get(j - 1).compareTo(array.get(j)) > 0; j--) {
+                Integer tmp = array.get(j);
+                array.set(j, array.get(j - 1));
+                array.set(j - 1, tmp);
+            }
+        }
+    }
+    public void insert(Integer i) {
+        if (!this.has(i)) {
+            this.base_.add(i);
+            insertionSort(base_);
+        }
+    }
+
+    public void remove(Integer i) {
+        this.base_.remove(i);
+    }
+
+    public boolean has(Integer i) {
+        return this.base_.contains(i);
+    }
+
+    public boolean isEmpty() {
+        return this.base_.isEmpty();
+    }
+
+    public Integer min() {
+        Integer min = base_.getFirst();
+        for (Integer integer : base_) {
+            if (integer < min)
+                min = integer;
+        }
+        return min;
+    }
+
+    public Integer max() {
+        Integer max = base_.getFirst();
+        for (Integer integer : base_) {
+            if (integer > max)
+                max = integer;
+        }
+        return max;
+    }
+
+    public int size() {
+        return base_.size();
+    }
+
+    public static IntegerSet intersection(IntegerSet a, IntegerSet b) {
+        IntegerSet res = new IntegerSet();
+        for (int i = 0; i < a.size(); i++) {
+            if (b.has(a.base_.get(i)))
+                res.insert(a.base_.get(i));
+        }
+        return res;
+    }
+
+    public static IntegerSet union(IntegerSet a, IntegerSet b) {
+        IntegerSet res = new IntegerSet();
+        for (Integer i : a.base_)
+            res.insert(i);
+        for (Integer i : b.base_)
+            res.insert(i);
+
+        return res;
+    }
+}
diff --git a/graphs/java/notifyMe/.gitignore b/graphs/java/notifyMe/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/notifyMe/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/notifyMe/pom.xml b/graphs/java/notifyMe/pom.xml
new file mode 100644
index 0000000..67e31e2
--- /dev/null
+++ b/graphs/java/notifyMe/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>notifyMe</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/INotificationSender.java b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/INotificationSender.java
new file mode 100644
index 0000000..6146e8e
--- /dev/null
+++ b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/INotificationSender.java
@@ -0,0 +1,10 @@
+package fr.epita.assistants.notifyme.notify;
+
+public interface INotificationSender {
+    /**
+     * Entrypoint to send notifications.
+     * @param parMessage the message to use for the notification - may be discarded by the␣
+    ↪→implementation
+     */
+    void notify(final String parSender, final String parReceiver, final String parMessage);
+}
diff --git a/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/ShellNotifier.java b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/ShellNotifier.java
new file mode 100644
index 0000000..c2631f7
--- /dev/null
+++ b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/notify/ShellNotifier.java
@@ -0,0 +1,22 @@
+package fr.epita.assistants.notifyme.notify;
+
+public class ShellNotifier implements INotificationSender {
+    final boolean err;
+
+    /**
+     * Constructor
+     *
+     * @param parStdErr if true, print to stderr, otherwise print to stdout
+     */
+    public ShellNotifier(final boolean parStdErr) {
+        err = parStdErr;
+    }
+
+    @Override
+    public void notify(String parSender, String parReceiver, String parMessage) {
+        if (err)
+            System.err.println("Notification from " + parSender + " to " + parReceiver + " received: " + parMessage);
+        else
+            System.out.println("Notification from " + parSender + " to " + parReceiver + " received: " + parMessage);
+    }
+}
diff --git a/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/IMultiNotificationSender.java b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/IMultiNotificationSender.java
new file mode 100644
index 0000000..501a070
--- /dev/null
+++ b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/IMultiNotificationSender.java
@@ -0,0 +1,26 @@
+package fr.epita.assistants.notifyme.user;
+
+import fr.epita.assistants.notifyme.notify.INotificationSender;
+
+import java.util.List;
+
+public interface IMultiNotificationSender {
+    /**
+     * Sends a notification to all registered notifiers
+     * @param parRecipient the recipient of the notification
+     * @param parMessage the message to send
+     */
+    void sendNotifications(String parRecipient, String parMessage);
+
+    /**
+     * Adds a notification sender to the list of possible recipients
+     * @param parNotifier the new notifier to add, should be ignored if null
+     */
+    void addNotifier(INotificationSender parNotifier);
+
+    /**
+     * Returns the list of notifiers
+     * @return the list of notifiers
+     */
+    List<INotificationSender> getNotifiers();
+}
diff --git a/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/User.java b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/User.java
new file mode 100644
index 0000000..58d4446
--- /dev/null
+++ b/graphs/java/notifyMe/src/main/java/fr/epita/assistants/notifyme/user/User.java
@@ -0,0 +1,41 @@
+package fr.epita.assistants.notifyme.user;
+
+import fr.epita.assistants.notifyme.notify.INotificationSender;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class User implements IMultiNotificationSender {
+    final List<INotificationSender> parNotificationList;
+    final String username;
+
+    public String getUsername() {
+        return username;
+    }
+
+    public User(String username) {
+        this.username = username;
+        this.parNotificationList = new ArrayList<>();
+    }
+
+    public User(String username, List<INotificationSender> parNotificationList) {
+        this.parNotificationList = parNotificationList;
+        this.username = username;
+    }
+
+    @Override
+    public void sendNotifications(String parRecipient, String parMessage) {
+        for (INotificationSender n : parNotificationList)
+            n.notify(username, parRecipient, parMessage);
+    }
+
+    @Override
+    public void addNotifier(INotificationSender parNotifier) {
+        parNotificationList.add(parNotifier);
+    }
+
+    @Override
+    public List<INotificationSender> getNotifiers() {
+        return parNotificationList;
+    }
+}
diff --git a/graphs/java/nucBatlle/.gitignore b/graphs/java/nucBatlle/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/nucBatlle/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/nucBattle/.gitignore b/graphs/java/nucBattle/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/nucBattle/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/nucBattle/pom.xml b/graphs/java/nucBattle/pom.xml
new file mode 100644
index 0000000..2ce959c
--- /dev/null
+++ b/graphs/java/nucBattle/pom.xml
@@ -0,0 +1,150 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>nucBattle</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>2.18.0</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.18.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Battle.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Battle.java
new file mode 100644
index 0000000..35a9b3e
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Battle.java
@@ -0,0 +1,18 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor
+public class Battle {
+    @JsonProperty("battle_id")
+    private int battleId;
+
+    private List<Turn> turns;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/BattleManager.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/BattleManager.java
new file mode 100644
index 0000000..57d7dcc
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/BattleManager.java
@@ -0,0 +1,101 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Stream;
+
+public class BattleManager {
+    String input;
+    private Map<String, Nuc> nucs;
+    private Battle battle;
+
+    public BattleManager(String input) {
+        this.input = input;
+    }
+
+    public void computeBattle(String reportPath) {
+        Report report = new Report();
+        try (Stream<String> stream = Files.lines(Paths.get(input))) {
+            String jsonString = stream.reduce("", (s1, s2) -> s1 + s2);
+            ObjectMapper om = new ObjectMapper();
+            JsonNode jn = om.readTree(jsonString);
+            if (jn == null || jn.isNull()) {
+                report.setType(ReportType.ERROR);
+                exportReport(reportPath, report);
+            }
+            nucs = om.readValue(jn.get("NUCs").toString(), new TypeReference<Map<String, Nuc>>() {
+            });
+
+            SimpleModule mod = new SimpleModule();
+            mod.addDeserializer(Turn.class, new TurnDeserializer(nucs));
+            om.registerModule(mod);
+            battle = om.readValue(jn.get("battle").toString(), Battle.class);
+            // winner pre-check
+            for (String t : nucs.keySet()) {
+                if (nucs.keySet().stream().filter(login -> !t.equals(login)).allMatch(login -> nucs.get(login).getHp() == 0.0)) {
+                    report.setType(ReportType.WINNER);
+                    report.setPlayer(t);
+                    exportReport(reportPath, report);
+                    return;
+                }
+                nucs.computeIfPresent(t, (k, tmp) -> new Nuc(tmp.getName(), Math.clamp(tmp.getHp(), 0, 100), tmp.getInstalledPrograms()));
+            }
+            for (Turn t : battle.getTurns()) {
+                if (nucs.get(t.getPlayerLogin()) == null || nucs.get(t.getTargetLogin()) == null) {
+                    report.setType(ReportType.ERROR);
+                    exportReport(reportPath, report);
+                    return;
+                }
+                // cheater check
+                if (!t.getPlayerNuc().getInstalledPrograms().containsAll(t.getPacket().getUsedPrograms())) {
+                    report.setType(ReportType.CHEATER);
+                    report.setPlayer(t.getPlayerLogin());
+                    exportReport(reportPath, report);
+                    return;
+                }
+                // swap nukes to update damage
+                Nuc n = nucs.get(t.getTargetLogin());
+                Nuc tmp = new Nuc(n.getName(), Math.clamp(n.getHp() - t.getPacket().getDamage(), 0, 100),
+                        n.getInstalledPrograms());
+                nucs.put(t.getTargetLogin(), tmp);
+
+                // winner check
+                if (nucs.keySet().stream().filter(login -> !t.getPlayerLogin().equals(login)).allMatch(login -> nucs.get(login).getHp() == 0.0)) {
+                    report.setType(ReportType.WINNER);
+                    report.setPlayer(t.getPlayerLogin());
+                    exportReport(reportPath, report);
+                    return;
+                }
+            }
+            report.setType(ReportType.UNFINISHED);
+            exportReport(reportPath, report);
+        } catch (IOException e) {
+            report.setType(ReportType.ERROR);
+            exportReport(reportPath, report);
+        }
+    }
+
+    private void exportReport(String reportPath, Report report) {
+        if (report.getType() != ReportType.ERROR && report.getType() != ReportType.CHEATER) {
+            report.outcome = new HashMap<>();
+            for (String login : nucs.keySet()) {
+                report.outcome.put(login, nucs.get(login).getHp());
+            }
+        }
+        ObjectMapper om = new ObjectMapper();
+        try {
+            om.writeValue(new File(reportPath), report);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Nuc.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Nuc.java
new file mode 100644
index 0000000..e2e4a48
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Nuc.java
@@ -0,0 +1,20 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor
+public class Nuc {
+    private String name;
+
+    private float hp;
+
+    @JsonProperty("installed_programs")
+    private List<String> installedPrograms;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Packet.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Packet.java
new file mode 100644
index 0000000..e8806f7
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Packet.java
@@ -0,0 +1,20 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Getter
+@AllArgsConstructor
+@NoArgsConstructor
+public class Packet {
+    @JsonProperty("used_programs")
+    private List<String> usedPrograms;
+
+    private String command;
+
+    private float damage;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Report.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Report.java
new file mode 100644
index 0000000..56aa10d
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Report.java
@@ -0,0 +1,18 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.util.Map;
+
+@NoArgsConstructor
+@Getter
+@Setter
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class Report {
+    ReportType type = ReportType.UNFINISHED;
+    String player = null;
+    Map<String, Float> outcome = null;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/ReportType.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/ReportType.java
new file mode 100644
index 0000000..c643c1b
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/ReportType.java
@@ -0,0 +1,14 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+public enum ReportType {
+    @JsonProperty("winner")
+    WINNER,
+    @JsonProperty("cheater")
+    CHEATER,
+    @JsonProperty("error")
+    ERROR,
+    @JsonProperty("unfinished")
+    UNFINISHED;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Turn.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Turn.java
new file mode 100644
index 0000000..57e44dc
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/Turn.java
@@ -0,0 +1,18 @@
+package fr.epita.assistants.nucbattle;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Getter
+public class Turn {
+    private Nuc playerNuc;
+    private String playerLogin;
+
+    private Nuc targetNuc;
+    private String targetLogin;
+
+    private Packet packet;
+}
diff --git a/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/TurnDeserializer.java b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/TurnDeserializer.java
new file mode 100644
index 0000000..bfd60ba
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/java/fr/epita/assistants/nucbattle/TurnDeserializer.java
@@ -0,0 +1,30 @@
+package fr.epita.assistants.nucbattle;
+
+import com.fasterxml.jackson.core.JacksonException;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.io.IOException;
+import java.util.Map;
+
+public class TurnDeserializer extends JsonDeserializer<Turn> {
+    public TurnDeserializer(Map<String, Nuc> nucs) {
+        this.nucs = nucs;
+    }
+
+    Map<String, Nuc> nucs;
+    @Override
+    public Turn deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JacksonException {
+        JsonNode node = jsonParser.getCodec().readTree(jsonParser);
+        String player_login = node.get("player_login").asText();
+        String target_login = node.get("target_login").asText();
+
+        final ObjectMapper om = new ObjectMapper();
+        Packet packet  = om.readValue(node.get("packet").toString(), Packet.class);
+        return new Turn(nucs.get(player_login), player_login, nucs.get(target_login), target_login, packet);
+    }
+}
diff --git a/graphs/java/nucBattle/src/main/resources/exampleBattle1.json b/graphs/java/nucBattle/src/main/resources/exampleBattle1.json
new file mode 100644
index 0000000..3d541dd
--- /dev/null
+++ b/graphs/java/nucBattle/src/main/resources/exampleBattle1.json
@@ -0,0 +1,66 @@
+{
+  "NUCs": {
+    "xavier.login": {
+      "name": "r01p02",
+      "hp": 50.0,
+      "installed_programs": [
+        "yes",
+        "grep",
+        "pkill",
+        "ping",
+        "bash"
+      ]
+    },
+    "xavier.login2": {
+      "name": "r04p03",
+      "hp": 72.0,
+      "installed_programs": [
+        "find",
+        "cp",
+        "bash",
+        "wget"
+      ]
+    }
+  },
+  "battle": {
+    "battle_id": 9876,
+    "turns": [
+      {
+        "player_login": "xavier.prout",
+        "target_login": "xavier.login2",
+        "packet": {
+          "used_programs": [
+            "bash",
+            "yes"
+          ],
+          "command": "yes > ~/y",
+          "damage": 51.0
+        }
+      },
+      {
+        "player_login": "xavier.login2",
+        "target_login": "xavier.login",
+        "packet": {
+          "used_programs": [
+            "bash",
+            "cp",
+            "find"
+          ],
+          "command": "find / -type f -exec cp {} /tmp/ \\;",
+          "damage": 21.0
+        }
+      },
+      {
+        "player_login": "xavier.login",
+        "target_login": "xavier.login2",
+        "packet": {
+          "used_programs": [
+            "bash"
+          ],
+          "command": ":(){:|: &};:",
+          "damage": 32.0
+        }
+      }
+    ]
+  }
+}
diff --git a/graphs/java/observer/.gitignore b/graphs/java/observer/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/observer/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/observer/pom.xml b/graphs/java/observer/pom.xml
new file mode 100644
index 0000000..5755011
--- /dev/null
+++ b/graphs/java/observer/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>observer</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Lifeguard.java b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Lifeguard.java
new file mode 100644
index 0000000..87c5538
--- /dev/null
+++ b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Lifeguard.java
@@ -0,0 +1,21 @@
+package fr.epita.assistants.observer;
+
+import java.util.Set;
+
+public class Lifeguard implements Observable.Observer<Swimmer> {
+    String name;
+
+    public Lifeguard(String name) {
+        this.name = name;
+        System.out.println(name + " begins to keep an eye on the swimmers.");
+    }
+
+    @Override
+    public void onEvent(Swimmer event) {
+        if (event.getStatus() == SwimmerStatus.TOO_FAR)
+            System.out.println(name + ": " + event.getName() + "! You are too far, come back!");
+        else if (event.getStatus() == SwimmerStatus.DROWNING) {
+            System.out.println(name + ": I will save you " + event.getName() + "!");
+        }
+    }
+}
diff --git a/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Observable.java b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Observable.java
new file mode 100644
index 0000000..1739739
--- /dev/null
+++ b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Observable.java
@@ -0,0 +1,55 @@
+package fr.epita.assistants.observer;
+
+import java.util.Set;
+
+/**
+ * Observer interface.
+ *
+ * @param <EVENT_T> Type of observed events
+ */
+public interface Observable<EVENT_T> {
+
+    /**
+     * Get all registered observers.
+     *
+     * @return The set of observers
+     */
+    Set<Observer<EVENT_T>> getObservers();
+
+    /**
+     * Register observers.
+     *
+     * @param observers Observers to register
+     */
+    void register(final Observer<EVENT_T>... observers);
+
+    /**
+     * Unregister the given observer.
+     *
+     * @param observer The observer to deactivate
+     */
+    void unregister(final Observer<EVENT_T> observer);
+
+    /**
+     * Notify all registered observers of the given event.
+     *
+     * @param event The event to notify observers with.
+     */
+    void fire(final EVENT_T event);
+
+    /**
+     * Sub interface for observers.
+     *
+     * @param <EVENT_T> The type of observed events
+     */
+    @FunctionalInterface
+    interface Observer<EVENT_T> {
+
+        /**
+         * Notification callback.
+         *
+         * @param event The event being sent
+         */
+        void onEvent(final EVENT_T event);
+    }
+}
diff --git a/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Person.java b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Person.java
new file mode 100644
index 0000000..81247ac
--- /dev/null
+++ b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Person.java
@@ -0,0 +1,15 @@
+package fr.epita.assistants.observer;
+
+public class Person implements Observable.Observer<Swimmer> {
+    String name;
+
+    public Person(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public void onEvent(Swimmer event) {
+        if (event.getStatus() == SwimmerStatus.WAVING)
+            System.out.println(name + ": Waves back at " + event.getName() + ".");
+    }
+}
diff --git a/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Swimmer.java b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Swimmer.java
new file mode 100644
index 0000000..2ce803a
--- /dev/null
+++ b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/Swimmer.java
@@ -0,0 +1,55 @@
+package fr.epita.assistants.observer;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Swimmer implements Observable<Swimmer> {
+    Set<Observer<Swimmer>> observers = new HashSet<>();
+    String name;
+    SwimmerStatus status = SwimmerStatus.OK;
+
+    public Swimmer(String name) {
+        this.name = name;
+        System.out.println(this.name + " goes into the sea.");
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public SwimmerStatus getStatus() {
+        return status;
+    }
+
+    @Override
+    public Set<Observer<Swimmer>> getObservers() {
+        return observers;
+    }
+
+    public void setStatus(SwimmerStatus status) {
+        this.status = status;
+        if (status == SwimmerStatus.DROWNING) {
+            System.out.println(name + ": I'm drowning, help!!");
+        }
+        else if (status == SwimmerStatus.WAVING)
+            System.out.println(name + ": Waves towards the shore.");
+        fire(this);
+    }
+
+    @Override
+    public void register(Observer<Swimmer>... observers) {
+        this.observers.addAll(Arrays.asList(observers));
+    }
+
+    @Override
+    public void unregister(Observer<Swimmer> observer) {
+        this.observers.remove(observer);
+    }
+
+    @Override
+    public void fire(Swimmer event) {
+        for (Observer<Swimmer> o : this.observers)
+            o.onEvent(event);
+    }
+}
diff --git a/graphs/java/observer/src/main/java/fr/epita/assistants/observer/SwimmerStatus.java b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/SwimmerStatus.java
new file mode 100644
index 0000000..71856c6
--- /dev/null
+++ b/graphs/java/observer/src/main/java/fr/epita/assistants/observer/SwimmerStatus.java
@@ -0,0 +1,11 @@
+package fr.epita.assistants.observer;
+
+/**
+ * Status of a swimmer.
+ */
+public enum SwimmerStatus {
+    OK,
+    DROWNING,
+    TOO_FAR,
+    WAVING
+}
diff --git a/graphs/java/pizzaStreams/.gitignore b/graphs/java/pizzaStreams/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/pizzaStreams/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/pizzaStreams/pom.xml b/graphs/java/pizzaStreams/pom.xml
new file mode 100644
index 0000000..ffa630f
--- /dev/null
+++ b/graphs/java/pizzaStreams/pom.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>pizzaStreams</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>3.29.2-GA</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Dough.java b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Dough.java
new file mode 100644
index 0000000..a0ea259
--- /dev/null
+++ b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Dough.java
@@ -0,0 +1,16 @@
+package fr.epita.assistants.pizzastreams;
+
+public enum Dough {
+    NATURE(2),
+    CAJUN(3);
+
+    private final Integer price;
+
+    Dough(final Integer price) {
+        this.price = price;
+    }
+
+    public Integer getPrice() {
+        return this.price;
+    }
+}
diff --git a/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Pizza.java b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Pizza.java
new file mode 100644
index 0000000..d47b8da
--- /dev/null
+++ b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Pizza.java
@@ -0,0 +1,47 @@
+package fr.epita.assistants.pizzastreams;
+
+import fr.epita.assistants.pizzastreams.Topping.Cheese;
+import fr.epita.assistants.pizzastreams.Topping.Protein;
+import fr.epita.assistants.pizzastreams.Topping.Sauce;
+import fr.epita.assistants.pizzastreams.Topping.Vegetable;
+
+import java.util.List;
+
+public class Pizza {
+    private final String name;
+    private final Dough dough;
+    private final Topping topping;
+    private final Integer price;
+
+    public Pizza(final String name, final Dough dough, final Sauce sauce, final Cheese cheese,
+                 final List<Vegetable> vegetableList, final Protein protein) {
+        this.name = name;
+        this.topping = new Topping(sauce, cheese, vegetableList, protein);
+        this.dough = dough;
+
+        final int doughPrice = dough.getPrice();
+        final int saucePrice = topping.getSaucePrice();
+        final int cheesePrice = topping.getCheesePrice();
+        final int vegetablesPrice = topping.getVegetablesPrice();
+        final int proteinPrice = topping.getProteinPrice();
+
+        this.price = doughPrice + saucePrice + cheesePrice + vegetablesPrice
+                + proteinPrice;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Dough getDough() {
+        return dough;
+    }
+
+    public Topping getTopping() {
+        return topping;
+    }
+
+    public Integer getPrice() {
+        return price;
+    }
+}
diff --git a/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/PizzaStreams.java b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/PizzaStreams.java
new file mode 100644
index 0000000..26259a3
--- /dev/null
+++ b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/PizzaStreams.java
@@ -0,0 +1,60 @@
+package fr.epita.assistants.pizzastreams;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Stream;
+
+import fr.epita.assistants.pizzastreams.Topping.*;
+
+public class PizzaStreams {
+    /**
+     * @return The sum of the prices of all the pizzas in the stream
+     */
+    public static Integer getTotalPrice(Stream<Pizza> pizzaStream) {
+        return pizzaStream.mapToInt(Pizza::getPrice).sum();
+    }
+
+    /**
+     * @return The average price of the pizzas in the stream, or the
+     * double NaN if the stream is empty
+     */
+    public static Double getAveragePrice(Stream<Pizza> pizzaStream) {
+        return pizzaStream.mapToDouble(Pizza::getPrice).average().orElse(Double.NaN);
+    }
+
+    /**
+     * @return Names of the pizzas, sorted by price in ascending order
+     */
+    public static List<String> sortByPrice(Stream<Pizza> pizzaStream) {
+        return pizzaStream.sorted(Comparator.comparing(Pizza::getPrice)).map(Pizza::getName).toList();
+    }
+
+    /**
+     * @return The Pizza object that has the lowest price, or null by default
+     */
+    public static Pizza getCheapest(Stream<Pizza> pizzaStream) {
+        return pizzaStream.min(Comparator.comparing(Pizza::getPrice)).orElse(null);
+    }
+
+    /**
+     * @return Names of the pizzas with meat (Protein)
+     */
+    public static List<String> getCarnivorous(Stream<Pizza> pizzaStream) {
+        return pizzaStream.filter(i -> i.getTopping().getProtein().isPresent()).map(Pizza::getName).toList();
+    }
+
+    /**
+     * @return Names of the pizzas with at least one Vegetable and no Proteins
+     */
+    public static List<String> getVeggies(Stream<Pizza> pizzaStream) {
+        return pizzaStream.filter(i -> i.getTopping().getProtein().isEmpty() && !i.getTopping().getVegetableList().isEmpty()).map(Pizza::getName).toList();
+    }
+
+    /**
+     * @return true if all the pizzas with a nature dough are based with tomato
+     * and mozzarella (italian pizza criteria), false otherwise
+     */
+    public static boolean areAllNatureItalians(Stream<Pizza> pizzaStream) {
+        return pizzaStream.filter(i -> i.getDough() == Dough.NATURE).allMatch(i -> i.getTopping().getCheese() == Cheese.MOZZARELLA && i.getTopping().getSauce() == Sauce.TOMATO);
+    }
+}
diff --git a/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Topping.java b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Topping.java
new file mode 100644
index 0000000..aaacb58
--- /dev/null
+++ b/graphs/java/pizzaStreams/src/main/java/fr/epita/assistants/pizzastreams/Topping.java
@@ -0,0 +1,82 @@
+package fr.epita.assistants.pizzastreams;
+
+import java.util.List;
+import java.util.Optional;
+
+public class Topping {
+    public enum Sauce {
+        TOMATO,
+        BUFFALO,
+        PESTO,
+    }
+
+    public enum Cheese {
+        MOZZARELLA,
+        CHEDDAR,
+        CREAM,
+    }
+
+    public enum Vegetable {
+        OLIVE,
+        MUSHROOM,
+        ONION,
+    }
+
+    public enum Protein {
+        CHICKEN,
+        BACON,
+        MERGUEZ,
+    }
+
+    private final Sauce sauce;
+    private final Cheese cheese;
+    private final List<Vegetable> vegetableList;
+    private final Protein protein;
+
+    public Topping(final Sauce sauce, final Cheese cheese, final List<Vegetable> vegetableList,
+                   final Protein protein) {
+        this.sauce = sauce;
+        this.cheese = cheese;
+        this.vegetableList = vegetableList;
+        this.protein = protein;
+    }
+
+    public Sauce getSauce() {
+        return sauce;
+    }
+
+    public Cheese getCheese() {
+        return cheese;
+    }
+
+    public List<Vegetable> getVegetableList() {
+        return vegetableList;
+    }
+
+    public Optional<Protein> getProtein() {
+        return Optional.ofNullable(protein);
+    }
+
+    public Integer getSaucePrice() {
+        return (sauce == Sauce.TOMATO) ? 1 : ((sauce == Sauce.BUFFALO) ? 2 : 3);
+    }
+
+    public Integer getCheesePrice() {
+        return (cheese == Cheese.MOZZARELLA) ? 2 : ((cheese == Cheese.CHEDDAR) ? 3 : 4);
+    }
+
+    public Integer getProteinPrice() {
+        return protein == null ? 0
+                : protein == Protein.CHICKEN ? 5 : 8;
+    }
+
+    public Integer getVegetablesPrice() {
+        return (vegetableList
+                .isEmpty()
+                ? 0
+                : vegetableList.stream()
+                .mapToInt((v) -> (v == Vegetable.OLIVE
+                        || v == Vegetable.ONION) ? 1 : 2)
+                .sum());
+    }
+}
diff --git a/graphs/java/practiceLombok/.gitignore b/graphs/java/practiceLombok/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/practiceLombok/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/practiceLombok/pom.xml b/graphs/java/practiceLombok/pom.xml
new file mode 100644
index 0000000..de31828
--- /dev/null
+++ b/graphs/java/practiceLombok/pom.xml
@@ -0,0 +1,139 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>practiceLombok</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.30</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Falcon.java b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Falcon.java
new file mode 100644
index 0000000..6c35ffc
--- /dev/null
+++ b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Falcon.java
@@ -0,0 +1,10 @@
+package fr.epita.assistants.practicelombok;
+
+import lombok.Data;
+
+@Data
+public class Falcon {
+    String name;
+    String nickname;
+    int speed;
+}
diff --git a/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Horse.java b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Horse.java
new file mode 100644
index 0000000..da9981e
--- /dev/null
+++ b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Horse.java
@@ -0,0 +1,13 @@
+package fr.epita.assistants.practicelombok;
+
+import lombok.*;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@ToString
+@EqualsAndHashCode
+public class Horse {
+    @Getter @Setter private String name;
+    @ToString.Exclude @Getter @Setter private String nickname;
+    @EqualsAndHashCode.Exclude @Getter private int speed;
+}
diff --git a/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Shark.java b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Shark.java
new file mode 100644
index 0000000..a2e5f3d
--- /dev/null
+++ b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Shark.java
@@ -0,0 +1,10 @@
+package fr.epita.assistants.practicelombok;
+
+import lombok.*;
+
+@Value
+public class Shark {
+    String name;
+    String nickname;
+    int speed;
+}
diff --git a/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Spider.java b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Spider.java
new file mode 100644
index 0000000..0091fc6
--- /dev/null
+++ b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Spider.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.practicelombok;
+
+import lombok.*;
+@AllArgsConstructor
+public class Spider {
+    @Getter @Setter public String name;
+}
diff --git a/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Tiger.java b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Tiger.java
new file mode 100644
index 0000000..1028dd3
--- /dev/null
+++ b/graphs/java/practiceLombok/src/main/java/fr/epita/assistants/practicelombok/Tiger.java
@@ -0,0 +1,11 @@
+package fr.epita.assistants.practicelombok;
+
+import lombok.*;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@ToString
+public class Tiger {
+    @Getter @Setter public String name;
+    @Getter @Setter public String nickname;
+}
diff --git a/graphs/java/rockPaperScissors/.gitignore b/graphs/java/rockPaperScissors/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/rockPaperScissors/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/rockPaperScissors/pom.xml b/graphs/java/rockPaperScissors/pom.xml
new file mode 100644
index 0000000..747b009
--- /dev/null
+++ b/graphs/java/rockPaperScissors/pom.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>rockPaperScissors</artifactId>
+    <version>1.0</version>
+
+
+    <properties>
+        <versions.java>21</versions.java>
+
+        <versions.junit>5.9.1</versions.junit>
+
+        <versions.maven-compiler-plugin>3.8.1</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>2.22.2</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.6.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.6.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>2.0.5</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.0.6</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Bot.java b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Bot.java
new file mode 100644
index 0000000..5d8005b
--- /dev/null
+++ b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Bot.java
@@ -0,0 +1,18 @@
+package fr.epita.assistants.rockPaperScissors;
+
+public class Bot {
+    final String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public Bot(String name) {
+        this.name = name;
+    }
+
+    public final HandShape getBotHandShape()
+    {
+        return new HandShape((int) (Math.random() * 2));
+    }
+}
diff --git a/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/HandShape.java b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/HandShape.java
new file mode 100644
index 0000000..1d95c92
--- /dev/null
+++ b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/HandShape.java
@@ -0,0 +1,26 @@
+package fr.epita.assistants.rockPaperScissors;
+
+import java.util.Arrays;
+import java.util.List;
+
+/*
+    Note that this kind of class should be replaced with an Enum.
+    Enums will be introduced later in the workshop.
+ */
+
+public class HandShape {
+    final static private List<String> shapesValues = Arrays.asList("ROCK", "PAPER", "SCISSORS");
+    final private int index;
+
+    public HandShape(final int index) {
+        this.index= index;
+    }
+
+    public String getName(){
+        return shapesValues.get(index);
+    }
+
+    int getIndex() {
+        return index;
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Match.java b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Match.java
new file mode 100644
index 0000000..2116f58
--- /dev/null
+++ b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Match.java
@@ -0,0 +1,52 @@
+package fr.epita.assistants.rockPaperScissors;
+
+import java.util.Objects;
+
+public final class Match {
+    private static int matchCount;
+    private final int currentMatchNumber;
+    final String player1, player2;
+    final HandShape player1Choice, player2Choice;
+
+    public Match(String player1, String player2, HandShape player1Choice, HandShape player2Choice) {
+        this.currentMatchNumber = ++matchCount;
+        this.player1 = player1;
+        this.player2 = player2;
+        this.player1Choice = player1Choice;
+        this.player2Choice = player2Choice;
+    }
+
+    public static int getMatchCount() {
+        return matchCount;
+    }
+
+    static void resetMatchCount()
+    {
+        matchCount = 0;
+    }
+
+    public int getCurrentMatch() {
+        return currentMatchNumber;
+    }
+
+    public void runMatch()
+    {
+        System.out.println("Let's start match number " + currentMatchNumber + "!");
+        System.out.println("Rock, Paper, Scissors!");
+        System.out.println(player1 + " is playing: " + player1Choice.getName());
+        System.out.println(player2 + " is playing: " + player2Choice.getName());
+
+        if (player1Choice.getIndex() == player2Choice.getIndex())
+        {
+            System.out.println("DRAW!");
+        }
+        else if (player1Choice.getIndex() == (player2Choice.getIndex() + 1) % 3)
+        {
+            System.out.println("The winner is " + player1 + "!");
+        }
+        else
+        {
+            System.out.println("The winner is " + player2 + "!");
+        }
+    }
+}
diff --git a/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Player.java b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Player.java
new file mode 100644
index 0000000..72e0761
--- /dev/null
+++ b/graphs/java/rockPaperScissors/src/main/java/fr/epita/assistants/rockPaperScissors/Player.java
@@ -0,0 +1,23 @@
+package fr.epita.assistants.rockPaperScissors;
+
+public final class Player {
+    final String name;
+    int choice;
+
+    public void setChoice(int choice) {
+        this.choice = choice;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Player(String name) {
+        this.name = name;
+    }
+
+    public HandShape getPlayerHandShape()
+    {
+        return new HandShape(choice);
+    }
+}
diff --git a/graphs/java/scheduler/.gitignore b/graphs/java/scheduler/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/scheduler/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/scheduler/pom.xml b/graphs/java/scheduler/pom.xml
new file mode 100644
index 0000000..007367f
--- /dev/null
+++ b/graphs/java/scheduler/pom.xml
@@ -0,0 +1,146 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>scheduler</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+        <!-- FIXME This should only be for testing (not included in student pom) -->
+        <dependency>
+            <groupId>com.tngtech.archunit</groupId>
+            <artifactId>archunit</artifactId>
+            <version>1.2.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.tngtech.archunit</groupId>
+            <artifactId>archunit-junit5-api</artifactId>
+            <version>1.0.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/MyTask.java b/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/MyTask.java
new file mode 100644
index 0000000..d1de4fb
--- /dev/null
+++ b/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/MyTask.java
@@ -0,0 +1,48 @@
+package fr.epita.assistants.scheduler;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class MyTask<INPUT_TYPE, RETURN_TYPE> implements Task<RETURN_TYPE> {
+    
+    CompletableFuture<RETURN_TYPE> cpFuture;
+
+    public MyTask(CompletableFuture<RETURN_TYPE> cpFuture) {
+        this.cpFuture = cpFuture;
+    }
+
+    public static <RETURN_TYPE> Task<RETURN_TYPE> of(Supplier<RETURN_TYPE> actionSupplier) {
+        return new MyTask<>(CompletableFuture.supplyAsync(actionSupplier));
+    }
+
+    public static <RETURN_TYPE> Task<RETURN_TYPE> of(Supplier<RETURN_TYPE> actionSupplier, Executor executor) {
+        return new MyTask<>(CompletableFuture.supplyAsync(actionSupplier, executor));
+    }
+
+    @Override
+    public CompletableFuture<RETURN_TYPE> build() {
+        return cpFuture;
+    }
+
+    @Override
+    public Task<RETURN_TYPE> onErrorRecoverWith(Function<Throwable, RETURN_TYPE> recoveryFunction) {
+        return new MyTask<>(cpFuture.handle((result, exception) -> {
+            if (exception != null)
+                return recoveryFunction.apply(exception);
+            return result;
+        }));
+    }
+
+    @Override
+    public <NEW_RETURN_TYPE> Task<NEW_RETURN_TYPE> andThenDo(Function<RETURN_TYPE, NEW_RETURN_TYPE> action) {
+        return new MyTask<>(cpFuture.thenApply(action));
+    }
+
+    @Override
+    public Task<RETURN_TYPE> andThenWait(long number, TimeUnit timeUnit) {
+        return new MyTask<>(cpFuture.thenApplyAsync(i -> i, CompletableFuture.delayedExecutor(number, timeUnit)));
+    }
+}
diff --git a/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/Task.java b/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/Task.java
new file mode 100644
index 0000000..64c0c03
--- /dev/null
+++ b/graphs/java/scheduler/src/main/java/fr/epita/assistants/scheduler/Task.java
@@ -0,0 +1,75 @@
+package fr.epita.assistants.scheduler;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+/**
+ * Represent a single task to be executed. Tasks can be chained using the andThenDo method.
+ *
+ * @param <RETURN_TYPE> The expected return type.
+ */
+public interface Task<RETURN_TYPE> {
+
+    /**
+     * Static initializer allowing the creation of a task instance with the given {@link Supplier}.
+     *
+     * @param actionSupplier The actual action to execute.
+     * @param <RETURN_TYPE>  The expected return type, inferred by the call chain.
+     * @return A {@link Task} instance.
+     */
+    static <RETURN_TYPE> Task<RETURN_TYPE> of(Supplier<RETURN_TYPE> actionSupplier) {
+        throw new UnsupportedOperationException("This default implementation should never be called, and should be" +
+                "implemented in classes that implement this interface");
+    }
+
+    /**
+     * Build the actual completable future according to this instance specifications.
+     *
+     * @return The built {@link CompletableFuture}.
+     */
+    CompletableFuture<RETURN_TYPE> build();
+
+    /**
+     * Execute a task and return its result.
+     *
+     * @return The result of the execution of this task.
+     */
+    default RETURN_TYPE execute() {
+        try {
+            return build().get();
+        } catch (InterruptedException | ExecutionException exception) {
+            throw new RuntimeException("Exception during task computing", exception);
+        }
+    }
+
+    /**
+     * Specify a function that provides a recovery value to use if the task fails.
+     *
+     * @param recoveryFunction The function that will be called with the exception - should any happen - in order to
+     *                         compute a recovery value.
+     * @return The updated task.
+     */
+    Task<RETURN_TYPE> onErrorRecoverWith(final Function<Throwable, RETURN_TYPE> recoveryFunction);
+
+    /**
+     * Chain a new task to be executed after the current one, taking the output of the current one as its input.
+     *
+     * @param action            The action to perform.
+     * @param <NEW_RETURN_TYPE> The return type of the task to create.
+     * @return The created task.
+     */
+    <NEW_RETURN_TYPE> Task<NEW_RETURN_TYPE> andThenDo(final Function<RETURN_TYPE, NEW_RETURN_TYPE> action);
+
+    /**
+     * Wait for the given number of timeUnit.
+     *
+     * @param number   The number of units to wait for.
+     * @param timeUnit The unit.
+     * @return The created task.
+     */
+    Task<RETURN_TYPE> andThenWait(final long number, final TimeUnit timeUnit);
+
+}
diff --git a/graphs/java/seq/.gitignore b/graphs/java/seq/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/seq/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/seq/pom.xml b/graphs/java/seq/pom.xml
new file mode 100644
index 0000000..46ba851
--- /dev/null
+++ b/graphs/java/seq/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>seq</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/seq/src/main/java/fr/epita/assistants/seq/ExtendedStream.java b/graphs/java/seq/src/main/java/fr/epita/assistants/seq/ExtendedStream.java
new file mode 100644
index 0000000..0ba5f6a
--- /dev/null
+++ b/graphs/java/seq/src/main/java/fr/epita/assistants/seq/ExtendedStream.java
@@ -0,0 +1,204 @@
+package fr.epita.assistants.seq;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+/**
+ * Extends the {@link Stream} interface, adding some very strangely lacking useful methods.
+ * You should use the Forwarding-Interface pattern.
+ * <p>
+ * The use of infinite, unordered or parallel stream in this implementation will
+ * not be tested.
+ *
+ * @param <ELEMENT_TYPE> the type of stream.
+ */
+@SuppressWarnings("unused")
+public interface ExtendedStream<ELEMENT_TYPE> extends Stream<ELEMENT_TYPE> {
+
+
+    /**
+     * Creates a map out of the stream.
+     * In case of duplicate keys, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param keyMapper  mapping function to extract map keys.
+     * @param <KEY_TYPE> the expected type of key.
+     * @return the created map.
+     */
+    <KEY_TYPE> Map<KEY_TYPE, ELEMENT_TYPE>
+    toMap(final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper);
+
+    /**
+     * Creates a map out of the stream.
+     * In case of key duplicates, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param map          the map to fill/update.
+     * @param keyMapper    mapping function to extract map keys.
+     * @param valueMapper  mapping function to extract map values.
+     * @param <KEY_TYPE>   the expected type of key.
+     * @param <VALUE_TYPE> the expected type of value.
+     * @param <MAP_TYPE>   the complete return type.
+     * @return the created map.
+     */
+    <KEY_TYPE, VALUE_TYPE, MAP_TYPE extends Map<KEY_TYPE, VALUE_TYPE>>
+    MAP_TYPE toMap(final MAP_TYPE map,
+                   final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper,
+                   final Function<ELEMENT_TYPE, VALUE_TYPE> valueMapper);
+
+    /**
+     * Creates a map out of the stream.
+     * In case of duplicate keys, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param keyMapper    mapping function to extract map keys.
+     * @param valueMapper  mapping function to extract map values.
+     * @param <KEY_TYPE>   the expected type of key.
+     * @param <VALUE_TYPE> the expected type of value.
+     * @return the created map.
+     */
+    <KEY_TYPE, VALUE_TYPE>
+    Map<KEY_TYPE, VALUE_TYPE> toMap(final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper,
+                                    final Function<ELEMENT_TYPE, VALUE_TYPE> valueMapper);
+
+    /**
+     * Converts the stream to a list.
+     *
+     * @return the created list.
+     */
+    List<ELEMENT_TYPE> toList();
+
+    /**
+     * Dumps the content of the stream to the given list.
+     *
+     * @param list   the list to dump values to.
+     * @param <LIST> the exact type of list.
+     * @return the updated list.
+     */
+    <LIST extends List<ELEMENT_TYPE>> LIST toList(final LIST list);
+
+    /**
+     * Converts the stream to a set.
+     *
+     * @return the built set.
+     */
+    Set<ELEMENT_TYPE> toSet();
+
+    /**
+     * Dumps the content of the stream to the given set.
+     *
+     * @param set   the set to update
+     * @param <SET> the set type.
+     * @return the updated set.
+     */
+    <SET extends Set<ELEMENT_TYPE>> SET toSet(final SET set);
+
+    /**
+     * Creates a stream of pairs of the content of the stream and values produced by a supplier.
+     *
+     * @param supplier          the value supplier.
+     * @param <ASSOCIATED_TYPE> the type of associated values.
+     * @return the built stream.
+     */
+    <ASSOCIATED_TYPE>
+    ExtendedStream<Pair<ELEMENT_TYPE, ASSOCIATED_TYPE>> associate(final Supplier<ASSOCIATED_TYPE> supplier);
+
+    /**
+     * Creates a stream of pairs of the content of the stream and values produces by another stream.
+     * Once any of the two streams is closed, the produced stream is complete, regardless of potential values remaining
+     * in the other stream.
+     *
+     * @param supplier          the value supplier.
+     * @param <ASSOCIATED_TYPE> the type of associated values.
+     * @return the built stream.
+     */
+    <ASSOCIATED_TYPE>
+    ExtendedStream<Pair<ELEMENT_TYPE, ASSOCIATED_TYPE>> associate(final Stream<ASSOCIATED_TYPE> supplier);
+
+    /**
+     * Prints the element of the stream on the standard output.
+     *
+     * @return this.
+     */
+    ExtendedStream<ELEMENT_TYPE> print();
+
+    /**
+     * Adds the content of the given stream to the current stream and returns it as a new one.
+     *
+     * @param stream the stream to add.
+     * @return a new stream containing the current one then the given one.
+     */
+    ExtendedStream<ELEMENT_TYPE> plus(final Stream<ELEMENT_TYPE> stream);
+
+    /**
+     * Builds a string by joining the string representation of all contained values, interspersed with the given string
+     * delimiter.
+     *
+     * @param delimiter the delimiter string.
+     * @return the built {@link String}.
+     */
+    String join(final String delimiter);
+
+    /**
+     * Builds a string by joining the string representation of all contained values.
+     *
+     * @return the built {@link String}.
+     */
+    String join();
+
+    /**
+     * Builds a pair of streams by partitioning the current one using the given pivot function.
+     *
+     * @param pivot      the function to segregate the values of the given stream.
+     * @param <KEY_TYPE> type of partition key.
+     * @return the pair of created streams.
+     */
+    <KEY_TYPE>
+    ExtendedStream<Pair<KEY_TYPE, ExtendedStream<ELEMENT_TYPE>>>
+    partition(final Function<ELEMENT_TYPE, KEY_TYPE> pivot);
+
+    /**
+     * A utility class representing a pair.
+     *
+     * @param <FIRST_TYPE>  the first value type.
+     * @param <SECOND_TYPE> the second value type.
+     */
+    @SuppressWarnings("WeakerAccess")
+    class Pair<FIRST_TYPE, SECOND_TYPE> {
+        /**
+         * The first value.
+         */
+        public final FIRST_TYPE first;
+
+        /**
+         * The second value.
+         */
+        public final SECOND_TYPE second;
+
+        /**
+         * Default CTor.
+         *
+         * @param first  value of the same name.
+         * @param second value of the same name.
+         */
+        public Pair(final FIRST_TYPE first, final SECOND_TYPE second) {
+            this.first = first;
+            this.second = second;
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            if (obj == null) return false;
+            if (!obj.getClass().equals(Pair.class)) return false;
+            final Pair pair = (Pair) obj;
+            return Objects.equals(first, pair.first) && Objects.equals(second, pair.second);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(first, second);
+        }
+    }
+}
diff --git a/graphs/java/seq/src/main/java/fr/epita/assistants/seq/Seq.java b/graphs/java/seq/src/main/java/fr/epita/assistants/seq/Seq.java
new file mode 100644
index 0000000..31e5cab
--- /dev/null
+++ b/graphs/java/seq/src/main/java/fr/epita/assistants/seq/Seq.java
@@ -0,0 +1,413 @@
+package fr.epita.assistants.seq;
+
+import java.util.*;
+import java.util.function.*;
+import java.util.stream.*;
+
+public interface Seq<ELEMENT_TYPE> extends ExtendedStream<ELEMENT_TYPE> {
+    Stream<ELEMENT_TYPE> giveStream();
+
+    static <ELEMENT_TYPE> Seq<ELEMENT_TYPE> of(Stream<ELEMENT_TYPE> stream) {
+        return () -> stream;
+    }
+
+    static <ELEMENT_TYPE> Seq<ELEMENT_TYPE> of(List<ELEMENT_TYPE> list) {
+        return list::stream;
+    }
+
+    static <ELEMENT_TYPE> Seq<ELEMENT_TYPE> of(ELEMENT_TYPE... values) {
+        List<ELEMENT_TYPE> vals = new ArrayList<>(Arrays.asList(values));
+        return vals::stream;
+    }
+
+    /**
+     * Creates a map out of the stream.
+     * In case of duplicate keys, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param keyMapper  mapping function to extract map keys.
+     * @param <KEY_TYPE> the expected type of key.
+     * @return the created map.
+     */
+    default <KEY_TYPE> Map<KEY_TYPE, ELEMENT_TYPE>
+    toMap(final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper) {
+        Map<KEY_TYPE, ELEMENT_TYPE> map = new HashMap<>();
+        giveStream().forEach(e -> map.put(keyMapper.apply(e), e));
+        return map;
+    }
+
+    /**
+     * Creates a map out of the stream.
+     * In case of key duplicates, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param map          the map to fill/update.
+     * @param keyMapper    mapping function to extract map keys.
+     * @param valueMapper  mapping function to extract map values.
+     * @param <KEY_TYPE>   the expected type of key.
+     * @param <VALUE_TYPE> the expected type of value.
+     * @param <MAP_TYPE>   the complete return type.
+     * @return the created map.
+     */
+    default <KEY_TYPE, VALUE_TYPE, MAP_TYPE extends Map<KEY_TYPE, VALUE_TYPE>>
+    MAP_TYPE toMap(final MAP_TYPE map,
+                   final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper,
+                   final Function<ELEMENT_TYPE, VALUE_TYPE> valueMapper) {
+        giveStream().forEach(e -> map.put(keyMapper.apply(e), valueMapper.apply(e)));
+        return map;
+    }
+
+    /**
+     * Creates a map out of the stream.
+     * In case of duplicate keys, the latest element in the original stream will overwrite the one(s) in place.
+     *
+     * @param keyMapper    mapping function to extract map keys.
+     * @param valueMapper  mapping function to extract map values.
+     * @param <KEY_TYPE>   the expected type of key.
+     * @param <VALUE_TYPE> the expected type of value.
+     * @return the created map.
+     */
+    default <KEY_TYPE, VALUE_TYPE>
+    Map<KEY_TYPE, VALUE_TYPE> toMap(final Function<ELEMENT_TYPE, KEY_TYPE> keyMapper,
+                                    final Function<ELEMENT_TYPE, VALUE_TYPE> valueMapper) {
+        Map<KEY_TYPE, VALUE_TYPE> map = new HashMap<>();
+        giveStream().forEach(e -> map.put(keyMapper.apply(e), valueMapper.apply(e)));
+        return map;
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> filter(Predicate<? super ELEMENT_TYPE> predicate) {
+        return giveStream().filter(predicate);
+    }
+
+    @Override
+    public default <R> Stream<R> map(Function<? super ELEMENT_TYPE, ? extends R> mapper) {
+        return giveStream().map(mapper);
+    }
+
+    @Override
+    public default IntStream mapToInt(ToIntFunction<? super ELEMENT_TYPE> mapper) {
+        return giveStream().mapToInt(mapper);
+    }
+
+    @Override
+    public default LongStream mapToLong(ToLongFunction<? super ELEMENT_TYPE> mapper) {
+        return giveStream().mapToLong(mapper);
+    }
+
+    @Override
+    public default DoubleStream mapToDouble(ToDoubleFunction<? super ELEMENT_TYPE> mapper) {
+        return giveStream().mapToDouble(mapper);
+    }
+
+    @Override
+    public default <R> Stream<R> flatMap(Function<? super ELEMENT_TYPE, ? extends Stream<? extends R>> mapper) {
+        return giveStream().flatMap(mapper);
+    }
+
+    @Override
+    public default IntStream flatMapToInt(Function<? super ELEMENT_TYPE, ? extends IntStream> mapper) {
+        return giveStream().flatMapToInt(mapper);
+    }
+
+    @Override
+    public default LongStream flatMapToLong(Function<? super ELEMENT_TYPE, ? extends LongStream> mapper) {
+        return giveStream().flatMapToLong(mapper);
+    }
+
+    @Override
+    public default DoubleStream flatMapToDouble(Function<? super ELEMENT_TYPE, ? extends DoubleStream> mapper) {
+        return giveStream().flatMapToDouble(mapper);
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> distinct() {
+        return giveStream().distinct();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> sorted() {
+        return giveStream().sorted();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> sorted(Comparator<? super ELEMENT_TYPE> comparator) {
+        return giveStream().sorted(comparator);
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> peek(Consumer<? super ELEMENT_TYPE> action) {
+        return giveStream().peek(action);
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> limit(long maxSize) {
+        return giveStream().limit(maxSize);
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> skip(long n) {
+        return giveStream().skip(n);
+    }
+
+    @Override
+    public default void forEach(Consumer<? super ELEMENT_TYPE> action) {
+        giveStream().forEach(action);
+    }
+
+    @Override
+    public default void forEachOrdered(Consumer<? super ELEMENT_TYPE> action) {
+        giveStream().forEachOrdered(action);
+    }
+
+    @Override
+    public default Object[] toArray() {
+        return giveStream().toArray();
+    }
+
+    @Override
+    public default <A> A[] toArray(IntFunction<A[]> generator) {
+        return giveStream().toArray(generator);
+    }
+
+    @Override
+    public default ELEMENT_TYPE reduce(ELEMENT_TYPE identity, BinaryOperator<ELEMENT_TYPE> accumulator) {
+        return giveStream().reduce(identity, accumulator);
+    }
+
+    @Override
+    public default Optional<ELEMENT_TYPE> reduce(BinaryOperator<ELEMENT_TYPE> accumulator) {
+        return giveStream().reduce(accumulator);
+    }
+
+    @Override
+    public default <U> U reduce(U identity, BiFunction<U, ? super ELEMENT_TYPE, U> accumulator, BinaryOperator<U> combiner) {
+        return giveStream().reduce(identity, accumulator, combiner);
+    }
+
+    @Override
+    public default <R> R collect(Supplier<R> supplier, BiConsumer<R, ? super ELEMENT_TYPE> accumulator, BiConsumer<R, R> combiner) {
+        return giveStream().collect(supplier, accumulator, combiner);
+    }
+
+    @Override
+    public default <R, A> R collect(Collector<? super ELEMENT_TYPE, A, R> collector) {
+        return giveStream().collect(collector);
+    }
+
+    /**
+     * Converts the stream to a list.
+     *
+     * @return the created list.
+     */
+    default List<ELEMENT_TYPE> toList() {
+        return giveStream().toList();
+    }
+
+    @Override
+    public default Optional<ELEMENT_TYPE> min(Comparator<? super ELEMENT_TYPE> comparator) {
+        return giveStream().min(comparator);
+    }
+
+    @Override
+    public default Optional<ELEMENT_TYPE> max(Comparator<? super ELEMENT_TYPE> comparator) {
+        return giveStream().max(comparator);
+    }
+
+    @Override
+    public default long count() {
+        return giveStream().count();
+    }
+
+    @Override
+    public default boolean anyMatch(Predicate<? super ELEMENT_TYPE> predicate) {
+        return giveStream().anyMatch(predicate);
+    }
+
+    @Override
+    public default boolean allMatch(Predicate<? super ELEMENT_TYPE> predicate) {
+        return giveStream().allMatch(predicate);
+    }
+
+    @Override
+    public default boolean noneMatch(Predicate<? super ELEMENT_TYPE> predicate) {
+        return giveStream().noneMatch(predicate);
+    }
+
+    @Override
+    public default Optional<ELEMENT_TYPE> findFirst() {
+        return giveStream().findFirst();
+    }
+
+    @Override
+    public default Optional<ELEMENT_TYPE> findAny() {
+        return giveStream().findAny();
+    }
+
+    /**
+     * Dumps the content of the stream to the given list.
+     *
+     * @param list   the list to dump values to.
+     * @param <LIST> the exact type of list.
+     * @return the updated list.
+     */
+    default <LIST extends List<ELEMENT_TYPE>> LIST toList(final LIST list) {
+        giveStream().forEach(list::add);
+        return list;
+    }
+
+    /**
+     * Converts the stream to a set.
+     *
+     * @return the built set.
+     */
+    default Set<ELEMENT_TYPE> toSet() {
+        return giveStream().collect(Collectors.toSet());
+    }
+
+    /**
+     * Dumps the content of the stream to the given set.
+     *
+     * @param set   the set to update
+     * @param <SET> the set type.
+     * @return the updated set.
+     */
+    default <SET extends Set<ELEMENT_TYPE>> SET toSet(final SET set) {
+        giveStream().forEach(set::add);
+        return set;
+    }
+
+    /**
+     * Creates a stream of pairs of the content of the stream and values produced by a supplier.
+     *
+     * @param supplier          the value supplier.
+     * @param <ASSOCIATED_TYPE> the type of associated values.
+     * @return the built stream.
+     */
+    default <ASSOCIATED_TYPE>
+    ExtendedStream<Pair<ELEMENT_TYPE, ASSOCIATED_TYPE>> associate(final Supplier<ASSOCIATED_TYPE> supplier) {
+        return Seq.of(giveStream().map(e -> new Pair<ELEMENT_TYPE,
+                ASSOCIATED_TYPE>(e, supplier.get())));
+    }
+
+    /**
+     * Creates a stream of pairs of the content of the stream and values produces by another stream.
+     * Once any of the two streams is closed, the produced stream is complete, regardless of potential values remaining
+     * in the other stream.
+     *
+     * @param supplier          the value supplier.
+     * @param <ASSOCIATED_TYPE> the type of associated values.
+     * @return the built stream.
+     */
+    default <ASSOCIATED_TYPE>
+    ExtendedStream<Pair<ELEMENT_TYPE, ASSOCIATED_TYPE>> associate(final Stream<ASSOCIATED_TYPE> supplier) {
+        List<ELEMENT_TYPE> elements = giveStream().toList();
+        List<ASSOCIATED_TYPE> assocs = supplier.toList();
+        return Seq.of(IntStream.range(0, Math.min(elements.size(),
+                assocs.size())).mapToObj(i -> new Pair<ELEMENT_TYPE, ASSOCIATED_TYPE>(elements.get(i), assocs.get(i))));
+    }
+
+    /**
+     * Prints the element of the stream on the standard output.
+     *
+     * @return this.
+     */
+    default ExtendedStream<ELEMENT_TYPE> print() {
+        return (ExtendedStream<ELEMENT_TYPE>) giveStream().peek(System.out::println);
+    }
+
+    /**
+     * Adds the content of the given stream to the current stream and returns it as a new one.
+     *
+     * @param stream the stream to add.
+     * @return a new stream containing the current one then the given one.
+     */
+    default ExtendedStream<ELEMENT_TYPE> plus(final Stream<ELEMENT_TYPE> stream) {
+        return Seq.of(Stream.concat(giveStream(), stream));
+    }
+
+    /**
+     * Builds a string by joining the string representation of all contained values, interspersed with the given string
+     * delimiter.
+     *
+     * @param delimiter the delimiter string.
+     * @return the built {@link String}.
+     */
+    default String join(final String delimiter) {
+        return giveStream().map(ELEMENT_TYPE::toString).collect(Collectors.joining(delimiter));
+    }
+
+    /**
+     * Builds a string by joining the string representation of all contained values.
+     *
+     * @return the built {@link String}.
+     */
+    default String join() {
+        return giveStream().map(ELEMENT_TYPE::toString).collect(Collectors.joining());
+    }
+
+    /**
+     * Builds a pair of streams by partitioning the current one using the given pivot function.
+     *
+     * @param pivot      the function to segregate the values of the given stream.
+     * @param <KEY_TYPE> type of partition key.
+     * @return the pair of created streams.
+     */
+    default <KEY_TYPE>
+    ExtendedStream<Pair<KEY_TYPE, ExtendedStream<ELEMENT_TYPE>>>
+    partition(final Function<ELEMENT_TYPE, KEY_TYPE> pivot) {
+        Map<KEY_TYPE, List<ELEMENT_TYPE>> map = new HashMap<>();
+        giveStream().forEach(e -> {
+            KEY_TYPE key = pivot.apply(e);
+            List<ELEMENT_TYPE> assoc = new ArrayList<>();
+            if (map.containsKey(key)) {
+                assoc.addAll(map.get(key));
+            }
+            assoc.add(e);
+            map.put(key, assoc);
+        });
+        List<Pair<KEY_TYPE, ExtendedStream<ELEMENT_TYPE>>> list = new ArrayList<>();
+        for (KEY_TYPE key : map.keySet()) {
+            list.add(new Pair<>(key, Seq.of(map.get(key).stream())));
+        }
+        return Seq.of(list.stream());
+    }
+
+    @Override
+    public default Iterator<ELEMENT_TYPE> iterator() {
+        return giveStream().iterator();
+    }
+
+    @Override
+    public default Spliterator<ELEMENT_TYPE> spliterator() {
+        return giveStream().spliterator();
+    }
+
+    @Override
+    public default boolean isParallel() {
+        return giveStream().isParallel();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> sequential() {
+        return giveStream().sequential();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> parallel() {
+        return giveStream().parallel();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> unordered() {
+        return giveStream().unordered();
+    }
+
+    @Override
+    public default Stream<ELEMENT_TYPE> onClose(Runnable closeHandler) {
+        return giveStream().onClose(closeHandler);
+    }
+
+    @Override
+    public default void close() {
+        giveStream().close();
+    }
+}
diff --git a/graphs/java/seq/src/test/java/fr/epita/assistants/seq/ExtendedStreamTest.java b/graphs/java/seq/src/test/java/fr/epita/assistants/seq/ExtendedStreamTest.java
new file mode 100644
index 0000000..b0bb911
--- /dev/null
+++ b/graphs/java/seq/src/test/java/fr/epita/assistants/seq/ExtendedStreamTest.java
@@ -0,0 +1,244 @@
+package fr.epita.assistants.seq;
+
+import java.lang.reflect.Modifier;
+import java.time.Duration;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+
+import fr.epita.assistants.seq.ExtendedStream.Pair;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Supplier;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class ExtendedStreamTest {
+
+    private static <TYPE> ExtendedStream<TYPE> ctor(final List<TYPE> values) {
+        // FIXME: replace by your own implementation.
+        return Seq.of(values);
+    }
+
+    private static <TYPE> ExtendedStream<TYPE> ctor(final TYPE... values) {
+        // FIXME: replace by your own implementation.
+        return Seq.of(values);
+    }
+
+    private static <TYPE> ExtendedStream<TYPE> ctor(final Stream<TYPE> values) {
+        // FIXME: replace by your own implementation.
+        return Seq.of(values);
+    }
+
+    private static DummyObject dummy(final int id, final String name) {
+        return new DummyObject(id, name);
+    }
+
+    @Test
+    public void isSeqAnInterface() throws ClassNotFoundException {
+        Class<?> seqClass = Class.forName("fr.epita.assistants.seq.Seq");
+        int modifiers = seqClass.getModifiers();
+        boolean isInterface = Modifier.isInterface(modifiers);
+        assertTrue(isInterface, "Seq must be an interface");
+    }
+
+    @Test
+    public void toMapKeyValue() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<DummyObject> es = ctor(dummy(1, "1"), dummy(2, "2"), dummy(2, "4"), dummy(3, "3"));
+            final Map<Integer, String> map = es.toMap(DummyObject::getId, DummyObject::getName);
+            assertEquals(3, map.size());
+            assertEquals("1", map.get(1));
+            assertEquals("4", map.get(2));
+            assertEquals("3", map.get(3));
+        });
+    }
+
+    @Test
+    public void toMapKeyValueMap() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<DummyObject> es = ctor(dummy(1, "1"), dummy(2, "2"), dummy(2, "4"), dummy(3, "3"));
+            final Map<Integer, DummyObject> source = new HashMap<>();
+            source.put(42, new DummyObject(42, "me"));
+            final Map<Integer, DummyObject> map = es.toMap(source, DummyObject::getId, it -> it);
+            assertEquals(4, map.size());
+            assertEquals("1", map.get(1).name);
+            assertEquals("4", map.get(2).name);
+            assertEquals("3", map.get(3).name);
+            assertEquals("me", map.get(42).name);
+        });
+    }
+
+    @Test
+    public void toMapKey() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<DummyObject> es = ctor(dummy(1, "1"), dummy(2, "2"), dummy(2, "4"), dummy(3, "3"));
+            final Map<Integer, DummyObject> map = es.toMap(DummyObject::getId);
+            assertEquals(3, map.size());
+            assertEquals("1", map.get(1).name);
+            assertEquals("4", map.get(2).name);
+            assertEquals("3", map.get(3).name);
+        });
+    }
+
+
+    @Test
+    public void toList() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<DummyObject> es = ctor(dummy(1, "1"), dummy(2, "2"), dummy(2, "4"), dummy(3, "3"));
+            final List<DummyObject> list = es.toList();
+            assertEquals(4, list.size());
+            assertEquals("1", list.get(0).name);
+            assertEquals("2", list.get(1).name);
+            assertEquals("4", list.get(2).name);
+            assertEquals("3", list.get(3).name);
+
+        });
+    }
+
+    @Test
+    public void toListWithList() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<DummyObject> es = ctor(dummy(1, "1"), dummy(2, "2"), dummy(2, "4"), dummy(3, "3"));
+            final List<DummyObject> source = new ArrayList<>();
+            source.add(new DummyObject(42, "me"));
+            final List<DummyObject> list = es.toList(source);
+            assertEquals(5, list.size());
+            assertEquals("me", list.get(0).name);
+            assertEquals("1", list.get(1).name);
+            assertEquals("2", list.get(2).name);
+            assertEquals("4", list.get(3).name);
+            assertEquals("3", list.get(4).name);
+        });
+    }
+
+    @Test
+    public void toSet() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<Integer> es = ctor(1, 2, 2, 3);
+            final Set<Integer> set = es.toSet();
+            assertEquals(3, set.size());
+            assertTrue(set.contains(1));
+            assertTrue(set.contains(2));
+            assertTrue(set.contains(3));
+        });
+    }
+
+    @Test
+    public void toSetWithSet() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<Integer> es = ctor(1, 2, 2, 3);
+            final Set<Integer> source = new HashSet<>();
+            source.add(1);
+            source.add(2);
+            source.add(42);
+            final Set<Integer> set = es.toSet(source);
+            assertEquals(4, set.size());
+            assertTrue(set.contains(1));
+            assertTrue(set.contains(2));
+            assertTrue(set.contains(3));
+            assertTrue(set.contains(42));
+        });
+    }
+
+    @Test
+    public void associateWithSupplier() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<String> es = ctor("a", "b", "c");
+            final List<Pair<String, Integer>> list = es.associate(new Increment()).toList();
+
+            assertEquals(3, list.size());
+            assertEquals(new Pair<>("a", 0), list.get(0));
+            assertEquals(new Pair<>("b", 1), list.get(1));
+            assertEquals(new Pair<>("c", 2), list.get(2));
+
+
+        });
+    }
+
+    @Test
+    public void associateWithStream() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<String> es = ctor("a", "b", "c");
+            final List<Pair<String, Integer>> list = es.associate(ctor(0, 1, 2, 3, 4, 5)).toList();
+
+            assertEquals(3, list.size());
+            assertEquals(new Pair<>("a", 0), list.get(0));
+            assertEquals(new Pair<>("b", 1), list.get(1));
+            assertEquals(new Pair<>("c", 2), list.get(2));
+        });
+    }
+
+    @Test
+    public void plus() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<String> es = ctor("a", "b", "c").plus(ctor("d", "e", "f"));
+            assertEquals("abcdef", es.join());
+        });
+    }
+
+    @Test
+    public void join() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<String> es = ctor("a", "b", "c", "d", "e", "f");
+            assertEquals("abcdef", es.join());
+        });
+    }
+
+    @Test
+    public void joinWithDelimiter() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<String> es = ctor("a", "b", "c", "d", "e", "f");
+            assertEquals("a-b-c-d-e-f", es.join("-"));
+        });
+    }
+
+    @Test
+    public void partition() {
+        assertTimeoutPreemptively(Duration.ofSeconds(10), () -> {
+            final ExtendedStream<Integer> es = ctor(0, 1, 2, 3, 4, 5, 6, 7);
+            final ExtendedStream<Pair<Boolean, ExtendedStream<Integer>>> partitions = es.partition(val -> val % 2 == 0);
+            final List<Pair<Boolean, ExtendedStream<Integer>>> list = partitions.toList();
+
+
+            assertEquals(list.get(0).first ? "0246" : "1357", list.get(0).second.join());
+            assertEquals(list.get(0).first ? "1357" : "0246", list.get(1).second.join());
+        });
+    }
+
+    static class DummyObject {
+        public final Integer id;
+        public final String name;
+
+        public DummyObject(final Integer id, final String name) {
+            this.id = id;
+            this.name = name;
+        }
+
+        public Integer getId() {
+            return id;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+
+
+    static class Increment implements Supplier<Integer> {
+        private int increment = 0;
+
+        @Override
+        public Integer get() {
+            return increment++;
+        }
+    }
+}
diff --git a/graphs/java/singleton/.gitignore b/graphs/java/singleton/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/singleton/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/singleton/pom.xml b/graphs/java/singleton/pom.xml
new file mode 100644
index 0000000..6bb46cb
--- /dev/null
+++ b/graphs/java/singleton/pom.xml
@@ -0,0 +1,141 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>singleton</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+        <versions.slf4j>1.7.36</versions.slf4j>
+        <versions.archunit>1.2.0</versions.archunit>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.tngtech.archunit</groupId>
+            <artifactId>archunit-junit5</artifactId>
+            <version>${versions.archunit}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/singleton/src/main/java/fr/epita/assistants/logger/Logger.java b/graphs/java/singleton/src/main/java/fr/epita/assistants/logger/Logger.java
new file mode 100644
index 0000000..4cc59f8
--- /dev/null
+++ b/graphs/java/singleton/src/main/java/fr/epita/assistants/logger/Logger.java
@@ -0,0 +1,62 @@
+package fr.epita.assistants.logger;
+
+/**
+ * A standard logger interface
+ */
+public interface Logger {
+    /**
+     * The Level enum, representing the gravity of a log message.
+     */
+    enum Level {
+        INFO,
+        WARN,
+        ERROR
+    }
+
+    /**
+     * Formats a message and returns it as a string
+     * @param level   The gravity level of the logged message.
+     * @param message The logged message.
+     * @return
+     */
+    static String getFormattedLog(final Level level, final String message) {
+        return '[' +
+                level.toString() +
+                "] " +
+                message;
+    }
+
+    /**
+     * Outputs the logged message with the format '[LEVEL] Message' to stderr.
+     *
+     * @param level   The gravity level of the logged message.
+     * @param message The logged message.
+     */
+    void log(final Level level, final String message);
+
+    /**
+     * Getter for infoCounter.
+     *
+     * @return infoCounter.
+     */
+    int getInfoCounter();
+
+    /**
+     * Getter for warnCounter.
+     *
+     * @return warnCounter.
+     */
+    int getWarnCounter();
+
+    /**
+     * Getter for errorCounter.
+     *
+     * @return errorCounter.
+     */
+    int getErrorCounter();
+
+    /**
+     * Resets the counters.
+     */
+    void reset();
+}
diff --git a/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/SingletonEnumLogger.java b/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/SingletonEnumLogger.java
new file mode 100644
index 0000000..4fb969e
--- /dev/null
+++ b/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/SingletonEnumLogger.java
@@ -0,0 +1,49 @@
+package fr.epita.assistants.singleton;
+
+import fr.epita.assistants.logger.Logger;
+
+public enum SingletonEnumLogger implements Logger {
+    INSTANCE;
+    int infoCounter;
+    int errorCounter;
+    int warnCounter;
+
+    @Override
+    public void log(Level level, String message) {
+        switch (level)
+        {
+            case INFO:
+                infoCounter++;
+                break;
+            case WARN:
+                warnCounter++;
+                break;
+            case ERROR:
+                errorCounter++;
+                break;
+        }
+        System.err.println(Logger.getFormattedLog(level, message));
+    }
+
+    @Override
+    public int getInfoCounter() {
+        return infoCounter;
+    }
+
+    @Override
+    public int getWarnCounter() {
+        return warnCounter;
+    }
+
+    @Override
+    public int getErrorCounter() {
+        return errorCounter;
+    }
+
+    @Override
+    public void reset() {
+        infoCounter = 0;
+        warnCounter = 0;
+        errorCounter = 0;
+    }
+}
diff --git a/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/StaticSingletonLogger.java b/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/StaticSingletonLogger.java
new file mode 100644
index 0000000..51d1801
--- /dev/null
+++ b/graphs/java/singleton/src/main/java/fr/epita/assistants/singleton/StaticSingletonLogger.java
@@ -0,0 +1,54 @@
+package fr.epita.assistants.singleton;
+
+import fr.epita.assistants.logger.Logger;
+
+public class StaticSingletonLogger implements Logger {
+    int infoCounter;
+    int errorCounter;
+    int warnCounter;
+    private StaticSingletonLogger() {
+        infoCounter = 0;
+        errorCounter = 0;
+        warnCounter = 0;
+    }
+
+    private static class InstanceHolder {
+        private static final StaticSingletonLogger _INSTANCE = new StaticSingletonLogger();
+    }
+
+    public static StaticSingletonLogger getInstance() {
+        return InstanceHolder._INSTANCE;
+    }
+    @Override
+    public void log(Level level, String message) {
+        switch (level)
+        {
+            case INFO -> infoCounter++;
+            case WARN -> warnCounter++;
+            case ERROR -> errorCounter++;
+        }
+        System.err.println(Logger.getFormattedLog(level, message));
+    }
+
+    @Override
+    public int getInfoCounter() {
+        return infoCounter;
+    }
+
+    @Override
+    public int getWarnCounter() {
+        return warnCounter;
+    }
+
+    @Override
+    public int getErrorCounter() {
+        return errorCounter;
+    }
+
+    @Override
+    public void reset() {
+        infoCounter = 0;
+        warnCounter = 0;
+        errorCounter = 0;
+    }
+}
diff --git a/graphs/java/streamStudent/.gitignore b/graphs/java/streamStudent/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/streamStudent/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/streamStudent/pom.xml b/graphs/java/streamStudent/pom.xml
new file mode 100644
index 0000000..d304253
--- /dev/null
+++ b/graphs/java/streamStudent/pom.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>streamStudent</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>3.29.2-GA</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Pair.java b/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Pair.java
new file mode 100644
index 0000000..c3cde84
--- /dev/null
+++ b/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Pair.java
@@ -0,0 +1,67 @@
+package fr.epita.assistants.streamstudent;
+
+public class Pair<K, V> {
+
+    /**
+     * Key of this pair.
+     */
+    private K key;
+
+    /**
+     * Gets the key for this pair.
+     *
+     * @return key for this pair
+     */
+    public K getKey() {
+        return key;
+    }
+
+    /**
+     * Value of this pair.
+     */
+    private V value;
+
+    /**
+     * Gets the value for this pair.
+     *
+     * @return value for this pair
+     */
+    public V getValue() {
+        return value;
+    }
+
+    /**
+     * Creates a new pair.
+     *
+     * @param key   The key for this pair
+     * @param value The value to use for this pair
+     */
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+
+    @Override
+    public int hashCode() {
+        return key.hashCode() * 13 + (value == null ? 0 : value.hashCode());
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o instanceof Pair) {
+            Pair pair = (Pair) o;
+            if (key != null ? !key.equals(pair.key) : pair.key != null) return false;
+            if (value != null ? !value.equals(pair.value) : pair.value != null) return false;
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return "(" + key + ", " + value + ")";
+    }
+}
+
diff --git a/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Streamer.java b/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Streamer.java
new file mode 100644
index 0000000..87654a4
--- /dev/null
+++ b/graphs/java/streamStudent/src/main/java/fr/epita/assistants/streamstudent/Streamer.java
@@ -0,0 +1,58 @@
+package fr.epita.assistants.streamstudent;
+
+import java.util.Comparator;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+
+public class Streamer {
+    public Stream<Pair<Integer, String>> validator(Stream<Pair<Integer, String>> stream) {
+        return stream.filter(student -> student.getKey() >= 0 && student.getKey() <= 100 && (Pattern.matches("[^_" +
+                ".]*\\.[^_.]*", student.getValue()) || Pattern.matches("[^._]*_[^._]*", student.getValue())));
+    }
+
+    public Stream<Pair<Integer, String>> orderGrade(Stream<Pair<Integer, String>> stream) {
+        return stream.sorted((i, j) -> {
+            if (!Objects.equals(i.getKey(), j.getKey()))
+                return i.getKey().compareTo(j.getKey());
+            else
+                return i.getValue().compareTo(j.getValue());
+        });
+    }
+
+    public Stream<Pair<Integer, String>> lowercase(Stream<Pair<Integer, String>> stream) {
+        return stream.map(i -> {
+            if (Pattern.matches(".*[A-Z]+.*", i.getValue())) {
+                return new Pair<>(i.getKey() / 2, i.getValue().toLowerCase());
+            } else
+                return new Pair<>(i.getKey(), i.getValue().toLowerCase());
+        });
+    }
+
+    public Optional<Pair<Integer, String>> headOfTheClass(Stream<Pair<Integer, String>> stream) {
+        return stream.max((i, j) -> {
+            if (j.getKey().equals(i.getKey()))
+                return j.getValue().compareTo(i.getValue());
+            else
+                return i.getKey().compareTo(j.getKey());
+        });
+    }
+
+    public Stream<Pair<Integer, String>> quickFix(Stream<Pair<Integer, String>> stream) {
+        return stream.map(i -> {
+            if (Pattern.matches("[mM][Aa].*", i.getValue()) || Pattern.matches("[lL].*[xX]", i.getValue())) {
+                return new Pair<>(Math.clamp(i.getKey() * 2, 0, 100), i.getValue());
+            } else return i;
+        });
+    }
+
+    public Stream<Pair<Integer, String>> encryption(Stream<Pair<Integer, String>> stream) {
+        return stream.map(i -> {
+            StringBuilder sb = new StringBuilder();
+            sb.append(i.getValue(), i.getValue().length() / 2, i.getValue().length());
+            sb.append(i.getValue(), 0, i.getValue().length() / 2);
+            return new Pair<>(i.getKey(), sb.toString());
+        });
+    }
+}
diff --git a/graphs/java/streamStudent/src/test/java/fr/epita/assistants/streamstudent/StreamStudentTest.java b/graphs/java/streamStudent/src/test/java/fr/epita/assistants/streamstudent/StreamStudentTest.java
new file mode 100644
index 0000000..d36fc09
--- /dev/null
+++ b/graphs/java/streamStudent/src/test/java/fr/epita/assistants/streamstudent/StreamStudentTest.java
@@ -0,0 +1,63 @@
+package fr.epita.assistants.streamstudent;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class StreamStudentTest {
+    static void assertStreamEquals(Stream<Pair<Integer, String>> expectedStream,
+                                   Stream<Pair<Integer, String>> actualStream) {
+        // Get iterators from stream
+        Iterator<Pair<Integer, String>> iterator1 = expectedStream.iterator();
+        Iterator<Pair<Integer, String>> iterator2 = actualStream.iterator();
+
+        while (iterator1.hasNext() && iterator2.hasNext()) {
+            // Get next objects
+            Pair<Integer, String> login1 = iterator1.next();
+            Pair<Integer, String> login2 = iterator2.next();
+
+            // Check if pairs are equal
+            assertEquals(login1, login2);
+        }
+
+        assertTrue(!iterator1.hasNext() && !iterator2.hasNext(),
+                "Streams do not have the same length");
+
+    }
+
+    @Test
+    public void validatorLoginContainsTwoOrMoreUnderscore() {
+        Pair<Integer, String> loginTwoUnderscore = new Pair<>(50, "xavier_login_");
+        Pair<Integer, String> loginValid = new Pair<>(90, "xavierlogin");
+        Pair<Integer, String> loginBoth = new Pair<>(90, "xavier._login");
+        Pair<Integer, String> loginMultipleUnderscord = new Pair<>(10, "_login__x");
+        Streamer streamer = new Streamer();
+
+        var loginList = List.of(loginTwoUnderscore, loginValid, loginBoth, loginMultipleUnderscord);
+
+        var actual = streamer.validator(loginList.stream());
+
+        assertEquals(0, actual.count());
+    }
+
+    @Test
+    public void encrypt1() {
+        Pair<Integer, String> loginTwoUnderscore = new Pair<>(50, "a_b");
+        Pair<Integer, String> xavier = new Pair<>(50, "xavier.login");
+        Pair<Integer, String> loginValid = new Pair<>(90, "thomas.kummel");
+        Pair<Integer, String> loginBoth = new Pair<>(90, "florian.fogliani");
+        Pair<Integer, String> loginMultipleUnderscord = new Pair<>(10, "malo.beauchamps");
+        Streamer streamer = new Streamer();
+
+        var loginList = List.of(loginTwoUnderscore, loginValid, loginBoth, loginMultipleUnderscord, xavier);
+
+        var actual = streamer.encryption(loginList.stream());
+        System.out.println("actual stream: " + actual.toString());
+    }
+
+        // Add your own tests here
+}
\ No newline at end of file
diff --git a/graphs/java/test1/.gitignore b/graphs/java/test1/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/test1/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/test1/pom.xml b/graphs/java/test1/pom.xml
new file mode 100644
index 0000000..1959226
--- /dev/null
+++ b/graphs/java/test1/pom.xml
@@ -0,0 +1,141 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>test1</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+        <versions.slf4j>1.7.36</versions.slf4j>
+        <versions.archunit>1.2.0</versions.archunit>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.tngtech.archunit</groupId>
+            <artifactId>archunit-junit5</artifactId>
+            <version>${versions.archunit}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/test1/src/main/java/fr/epita/assistants/maths/Matrix.java b/graphs/java/test1/src/main/java/fr/epita/assistants/maths/Matrix.java
new file mode 100644
index 0000000..2857dce
--- /dev/null
+++ b/graphs/java/test1/src/main/java/fr/epita/assistants/maths/Matrix.java
@@ -0,0 +1,33 @@
+package fr.epita.assistants.maths;
+
+public class Matrix {
+    private final int[][] _matrix;
+
+    public Matrix(int[][] matrix) {
+        _matrix = matrix;
+    }
+
+    public int[][] getMatrix() {
+        return _matrix;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        Matrix mat = (Matrix) obj;
+        return mat._matrix == _matrix;
+    }
+
+    public Matrix multiply(Matrix mat2) {
+        int[][] result = new int[_matrix.length][_matrix[0].length];
+
+        for (int i = 0; i < _matrix.length; i++)
+            for (int j = 0; j < mat2._matrix[0].length; j++) {
+                int value = 0;
+                for (int x = 0, y = 0; x < _matrix[i].length && y < mat2._matrix.length; x++, y++)
+                    value += _matrix[i][x] * mat2._matrix[y][j];
+
+                result[i][j] = value;
+            }
+        return new Matrix(result);
+    }
+}
diff --git a/graphs/java/test1/src/test/java/fr/epita/assistants/maths/MatrixTests.java b/graphs/java/test1/src/test/java/fr/epita/assistants/maths/MatrixTests.java
new file mode 100644
index 0000000..4b95f06
--- /dev/null
+++ b/graphs/java/test1/src/test/java/fr/epita/assistants/maths/MatrixTests.java
@@ -0,0 +1,113 @@
+package fr.epita.assistants.maths;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class MatrixTests {
+    @Test
+    public void ctor1() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        assertNotEquals(69, m.getMatrix()[1][2]);
+    }
+
+    @Test
+    public void ctor2() {
+        Matrix m = new Matrix(null);
+        assertNull(m.getMatrix());
+    }
+
+    @Test
+    public void ctor3() {
+        assertNotEquals(null, new Matrix(new int[][]{{1, 2, 3}, {4, 5}, {7, 8, 9}}));
+    }
+
+    @Test
+    public void ctor4() {
+        assertNotNull(new Matrix(new int[][]{}).getMatrix());
+    }
+
+    @Test
+    public void ctor5() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+
+        assertNotEquals(n.getMatrix()[1][2], m.getMatrix()[1][2]);
+    }
+
+    @Test
+    public void equals1() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        assertEquals(m, n);
+    }
+
+    @Test
+    public void equals2() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5}, {7, 8, 9}});
+        Matrix n = new Matrix(null);
+        assertNotEquals(m, n);
+    }
+
+    @Test
+    public void equals3() {
+        Matrix m = new Matrix(new int[][]{{1, 2}, {3, 4, 5}});
+        Matrix n = new Matrix(new int[][]{{1, 0}, {0, 1}});
+        assertNotEquals(m, n);
+    }
+
+    @Test
+    public void equals4() {
+        int[][] l = new int[][]{{1, 3, 4}, {1, 3, 4}};
+        assertEquals(new Matrix(l), new Matrix(l));
+    }
+
+    @Test
+    public void equals5() {
+        Matrix n = new Matrix(new int[][]{{1, 0}, {0, 1}});
+        assertTrue(n.equals("test"));
+    }
+
+    @Test
+    public void equals6() {
+        Matrix m = new Matrix(new int[][]{{1, 2}, {4}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{7, 8, 9}});
+        assertEquals(m, n);
+    }
+    @Test
+    public void equals7() {
+        Matrix m = new Matrix(new int[][]{{1, 2}, {4}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{});
+        assertEquals(m, n);
+    }
+    @Test
+    public void equals8() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 10}});
+        assertEquals(m, n);
+    }
+
+    @Test
+    public void mul1() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+
+        assertNotEquals(new Matrix(new int[][]{{30, 36, 42}, {66, 81, 96}, {102, 126, 150}}), m.multiply(n));
+    }
+
+    @Test
+    public void mul2() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+
+        assertNotEquals(new Matrix(new int[][]{{30, 36, 42}, {66, 81, 96}}), m.multiply(null));
+    }
+
+    @Test
+    public void mul3() {
+        Matrix m = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
+        Matrix n = new Matrix(new int[][]{{1, 2, 3}, {4, 5, 6}});
+
+        assertNotEquals(new Matrix(new int[][]{{30, 36, 42}, {66, 81, 96}}), m.multiply(n));
+    }
+    // add your own tests here
+}
\ No newline at end of file
diff --git a/graphs/java/test2/pom.xml b/graphs/java/test2/pom.xml
new file mode 100644
index 0000000..f0ab353
--- /dev/null
+++ b/graphs/java/test2/pom.xml
@@ -0,0 +1,141 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>test2</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+        <versions.slf4j>1.7.36</versions.slf4j>
+        <versions.archunit>1.2.0</versions.archunit>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.tngtech.archunit</groupId>
+            <artifactId>archunit-junit5</artifactId>
+            <version>${versions.archunit}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/test2/src/main/java/fr/epita/assistants/server/MyServer.java b/graphs/java/test2/src/main/java/fr/epita/assistants/server/MyServer.java
new file mode 100644
index 0000000..9a2a213
--- /dev/null
+++ b/graphs/java/test2/src/main/java/fr/epita/assistants/server/MyServer.java
@@ -0,0 +1,42 @@
+package fr.epita.assistants.server;
+
+import com.sun.net.httpserver.HttpServer;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+import static java.net.HttpURLConnection.HTTP_OK;
+
+public class MyServer {
+
+    private static HttpServer server = null;
+    private static ExecutorService executor;
+
+
+    public static void launchServer() throws IOException {
+        server = HttpServer.create(new InetSocketAddress("localhost", 8080), 0);
+        executor = Executors.newFixedThreadPool(10);
+        server.setExecutor(executor);
+        var context = server.createContext("/");
+        context.setHandler((arg) -> {
+            try {
+                Thread.sleep(1500);
+                arg.sendResponseHeaders(HTTP_OK, 0);
+                arg.close();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        });
+        server.start();
+    }
+
+
+    public static void stopServer() {
+        if (server == null)
+            return;
+        server.stop(0);
+        executor.shutdownNow();
+    }
+}
diff --git a/graphs/java/test2/src/main/java/fr/epita/assistants/test2/Test2.java b/graphs/java/test2/src/main/java/fr/epita/assistants/test2/Test2.java
new file mode 100644
index 0000000..8427b43
--- /dev/null
+++ b/graphs/java/test2/src/main/java/fr/epita/assistants/test2/Test2.java
@@ -0,0 +1,48 @@
+package fr.epita.assistants.test2;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class Test2 {
+    /**
+     * Computes the nth value of the tribonacci suite.
+     * f(0) = 0, f(1) = 1, f(2) = 1, f(n+3) = f(n) + f(n+1) + f(n+2)
+     *
+     * @param n the nth sequence to compute
+     */
+    public static long tribonacci(int n) {
+        if (n < 0)
+            throw new IllegalArgumentException("Error: n must be positive");
+
+        if (n == 0)
+            return 0;
+        if (n < 3)
+            return 1;
+
+        long one = 0;
+        long two = 1;
+        long three = 1;
+        long res = 0;
+
+        for (long i = 3; i <= n; i++) {
+            res = one + two + three;
+            one = two;
+            two = three;
+            three = res;
+        }
+
+        return res;
+    }
+
+    public static long serverGetResponseCode() throws IOException {
+        URL url = new URL("http://localhost:8080/");
+        HttpURLConnection con = (HttpURLConnection) url.openConnection();
+        con.setRequestMethod("GET");
+        return con.getResponseCode();
+    }
+
+    public static int division(int a, int b) {
+        return a / b;
+    }
+}
diff --git a/graphs/java/test2/src/test/java/fr/epita/assistants/test2/Test2Test.java b/graphs/java/test2/src/test/java/fr/epita/assistants/test2/Test2Test.java
new file mode 100644
index 0000000..0318dc2
--- /dev/null
+++ b/graphs/java/test2/src/test/java/fr/epita/assistants/test2/Test2Test.java
@@ -0,0 +1,105 @@
+package fr.epita.assistants.test2;
+
+import fr.epita.assistants.server.MyServer;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import java.io.IOException;
+import java.net.ConnectException;
+
+import static fr.epita.assistants.test2.Test2.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class Test2Test {
+    @Test
+    void divPass() {
+        assertEquals(2, division(5, 2));
+    }
+
+    @Test
+    void divFZero() {
+        assertThrows(ArithmeticException.class, () -> division(5, 0));
+    }
+    @Test
+    void divZeroZero() {
+        assertThrows(ArithmeticException.class, () -> division(0, 0));
+    }
+
+    @Test
+    @Timeout(1)
+    void divTimeout() {
+        assertEquals(0, division(0, 2));
+    }
+    @Test
+    @Timeout(1)
+    void divTimeoutFatAss() {
+        assertNotEquals(554468611, division(745343524, 5546344));
+    }
+
+    @Test
+    void divServerPass() throws IOException {
+        MyServer.stopServer();
+        MyServer.launchServer();
+        long actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        MyServer.stopServer();
+    }
+    @Test
+    void divServerSpam() throws IOException {
+        MyServer.stopServer();
+        MyServer.launchServer();
+        long actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        actual = serverGetResponseCode();
+        assertEquals(200, actual);
+
+        MyServer.stopServer();
+    }
+    @Test
+    void divServerNotStarted() {
+        MyServer.stopServer();
+        assertThrows(ConnectException.class, () -> serverGetResponseCode());
+    }
+    @Test
+    @Timeout(1)
+    void divServerTimeout() throws IOException {
+        MyServer.stopServer();
+        MyServer.launchServer();
+        long actual = serverGetResponseCode();
+        assertEquals(200, actual);
+        MyServer.stopServer();
+    }
+    @Test
+    @Timeout(1)
+    void triboFail() {
+        assertThrows(IllegalArgumentException.class, () -> tribonacci(-1));
+    }
+    @Test
+    @Timeout(1)
+    void triboPass() {
+        assertEquals(0, tribonacci(0));
+        assertEquals(1, tribonacci(1));
+        assertEquals(1, tribonacci(2));
+        assertEquals(2, tribonacci(3));
+        assertEquals(4, tribonacci(4));
+        assertEquals(7, tribonacci(5));
+        assertEquals(13, tribonacci(6));
+        assertEquals(1, tribonacci(7));
+        assertEquals(1, tribonacci(8));
+    }
+    @Test
+    @Timeout(1)
+    void triboTime() {
+        assertEquals(-1, tribonacci(Integer.MAX_VALUE));
+    }
+}
diff --git a/graphs/java/threadForkJoin/.gitignore b/graphs/java/threadForkJoin/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/threadForkJoin/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/threadForkJoin/pom.xml b/graphs/java/threadForkJoin/pom.xml
new file mode 100644
index 0000000..8e857e4
--- /dev/null
+++ b/graphs/java/threadForkJoin/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>threadForkJoin</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/threadForkJoin/src/main/java/fr/epita/assistants/forkjoin/MyRecursiveTask.java b/graphs/java/threadForkJoin/src/main/java/fr/epita/assistants/forkjoin/MyRecursiveTask.java
new file mode 100644
index 0000000..5934f92
--- /dev/null
+++ b/graphs/java/threadForkJoin/src/main/java/fr/epita/assistants/forkjoin/MyRecursiveTask.java
@@ -0,0 +1,49 @@
+package fr.epita.assistants.forkjoin;
+
+import java.util.concurrent.ForkJoinTask;
+import java.util.concurrent.RecursiveTask;
+
+public class MyRecursiveTask extends RecursiveTask<Double> {
+    final private double[][] matrix;
+    final private int xLowerBound;
+    final private int xUpperBound;
+    final private int yLowerBound;
+    final private int yUpperBound;
+
+    public MyRecursiveTask(double[][] matrix, int xLowerBound, int xUpperBound, int yLowerBound, int yUpperBound) {
+        this.matrix = matrix;
+        this.xLowerBound = xLowerBound;
+        this.xUpperBound = xUpperBound;
+        this.yLowerBound = yLowerBound;
+        this.yUpperBound = yUpperBound;
+    }
+
+    @Override
+    protected Double compute() {
+        if (xUpperBound - xLowerBound <= 5 && yUpperBound - yLowerBound <= 5) {
+            Double avg = 0.0;
+            for (int j = yLowerBound; j < yUpperBound; j++) {
+                for (int i = xLowerBound; i < xUpperBound; i++) {
+                    avg += matrix[j][i];
+                }
+            }
+            if ((xUpperBound - xLowerBound) * (yUpperBound - yLowerBound) == 0)
+                return 0.0;
+            return avg / ((xUpperBound - xLowerBound) * (yUpperBound - yLowerBound));
+        } else {
+            MyRecursiveTask t1 = new MyRecursiveTask(matrix, xLowerBound, xLowerBound + (xUpperBound - xLowerBound) / 2,
+                    yLowerBound, yLowerBound + (yUpperBound - yLowerBound) / 2);
+            MyRecursiveTask t2 = new MyRecursiveTask(matrix, xLowerBound + (xUpperBound - xLowerBound) / 2, xUpperBound,
+                    yLowerBound, yLowerBound + (yUpperBound - yLowerBound) / 2);
+            MyRecursiveTask t3 = new MyRecursiveTask(matrix, xLowerBound, xLowerBound + (xUpperBound - xLowerBound) / 2,
+                    yLowerBound + (yUpperBound - yLowerBound) / 2, yUpperBound);
+            MyRecursiveTask t4 = new MyRecursiveTask(matrix, xLowerBound + (xUpperBound - xLowerBound) / 2, xUpperBound,
+                    yLowerBound + (yUpperBound - yLowerBound) / 2, yUpperBound);
+            t1.fork();
+            t2.fork();
+            t3.fork();
+            t4.fork();
+            return (t1.join() + t2.join() + t3.join() + t4.join()) / 4;
+        }
+    }
+}
\ No newline at end of file
diff --git a/graphs/java/threadForkJoin/src/test/java/fr/epita/assistants/forkjoin/RecursiveTaskTest.java b/graphs/java/threadForkJoin/src/test/java/fr/epita/assistants/forkjoin/RecursiveTaskTest.java
new file mode 100644
index 0000000..c8f6877
--- /dev/null
+++ b/graphs/java/threadForkJoin/src/test/java/fr/epita/assistants/forkjoin/RecursiveTaskTest.java
@@ -0,0 +1,34 @@
+package fr.epita.assistants.forkjoin;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@Timeout(1)
+public class RecursiveTaskTest {
+    @Test
+    void exampleTest() {
+        // Create a Matrix
+        double[][] matrix = new double[][]{
+                new double[]{10, 52, 100, 50, 74, 25},
+                new double[]{10, 52, 100, 50, 74, 25},
+                new double[]{10, 52, 100, 50, 74, 25},
+                new double[]{10, 52, 100, 50, 74, 25},
+                new double[]{10, 52, 100, 50, 74, 25},
+                new double[]{10, 52, 100, 50, 74, 25}
+        };
+        double expected = 51.83;
+
+        MyRecursiveTask mrt = new MyRecursiveTask(matrix, 0, matrix[0].length, 0, matrix.length);
+
+        // Fork and join task
+        mrt.fork();
+        double got = mrt.join();
+
+        // Need delta because of 'double' type
+        assertEquals(expected, got, 0.01);
+    }
+
+    // Write your tests here ...
+}
diff --git a/graphs/java/throwback/.gitignore b/graphs/java/throwback/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/throwback/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/throwback/pom.xml b/graphs/java/throwback/pom.xml
new file mode 100644
index 0000000..ca306b0
--- /dev/null
+++ b/graphs/java/throwback/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>throwback</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/IntegerException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/IntegerException.java
new file mode 100644
index 0000000..7bc7337
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/IntegerException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public abstract class IntegerException extends Exception{
+    public IntegerException(String message) {
+        super("IntegerException: " + message);
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/LongStringException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/LongStringException.java
new file mode 100644
index 0000000..687c654
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/LongStringException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public class LongStringException extends StringException {
+    public LongStringException(String message) {
+        super("LongStringException: " + message + " (length: " + message.length() + ")");
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/NegativeIntegerException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/NegativeIntegerException.java
new file mode 100644
index 0000000..ce84fc1
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/NegativeIntegerException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public class NegativeIntegerException extends IntegerException {
+    public NegativeIntegerException(String message) {
+        super("NegativeIntegerException: " + message);
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/Pitcher.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/Pitcher.java
new file mode 100644
index 0000000..7093b08
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/Pitcher.java
@@ -0,0 +1,21 @@
+package fr.epita.assistants.throwback;
+
+import java.util.regex.Pattern;
+
+public class Pitcher {
+    public static void throwException(String message) throws
+            LongStringException, ShortStringException,
+            PositiveIntegerException, NegativeIntegerException,
+            UnknownException {
+        if (Pattern.matches("[0-9]+", message))
+            throw new PositiveIntegerException(message);
+        else if (Pattern.matches("-[0-9]+", message))
+            throw new NegativeIntegerException(message);
+        else if (Pattern.matches("[a-zA-Z ,.']{100,}", message))
+            throw new LongStringException(message);
+        else if (Pattern.matches("[a-zA-Z ,.']{1,100}", message))
+            throw new ShortStringException(message);
+        else
+            throw new UnknownException(message);
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/PositiveIntegerException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/PositiveIntegerException.java
new file mode 100644
index 0000000..124fcf1
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/PositiveIntegerException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public class PositiveIntegerException extends IntegerException{
+    public PositiveIntegerException(String message) {
+        super("PositiveIntegerException: " + message);
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/ShortStringException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/ShortStringException.java
new file mode 100644
index 0000000..28e5eda
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/ShortStringException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public class ShortStringException extends StringException {
+    public ShortStringException(String message) {
+        super("ShortStringException: " + message + " (length: " + message.length() + ")");
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/StringException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/StringException.java
new file mode 100644
index 0000000..03f10aa
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/StringException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public abstract class StringException extends Exception {
+    public StringException(String message) {
+        super("StringException: " + message);
+    }
+}
diff --git a/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/UnknownException.java b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/UnknownException.java
new file mode 100644
index 0000000..005ecee
--- /dev/null
+++ b/graphs/java/throwback/src/main/java/fr/epita/assistants/throwback/UnknownException.java
@@ -0,0 +1,7 @@
+package fr.epita.assistants.throwback;
+
+public class UnknownException extends Exception{
+    public UnknownException(String message) {
+        super("UnknownException: " + message);
+    }
+}
diff --git a/graphs/java/travel/.gitignore b/graphs/java/travel/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/travel/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/travel/pom.xml b/graphs/java/travel/pom.xml
new file mode 100644
index 0000000..671d430
--- /dev/null
+++ b/graphs/java/travel/pom.xml
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>travel</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+        <version>4.1</version>
+    </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Country.java b/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Country.java
new file mode 100644
index 0000000..e616e64
--- /dev/null
+++ b/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Country.java
@@ -0,0 +1,44 @@
+package fr.epita.assistants.travel;
+
+import com.opencsv.CSVReader;
+
+import java.io.FileReader;
+import java.time.ZoneId;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+public class Country {
+    String countryName;
+    public Map<String, Integer> travelTimes;
+    ZoneId countryZone;
+    String filename;
+
+    public Country(String countryName, String countryZone, String inputFilePath) {
+        this.countryName = countryName;
+        this.countryZone = ZoneId.of(countryZone);
+        this.filename = inputFilePath;
+        this.travelTimes = initTravelTimes(inputFilePath);
+    }
+
+    public Map<String, Integer> initTravelTimes(String inputFilePath) {
+        Map<String, Integer> res = new HashMap<>();
+        try {
+            CSVReader c = new CSVReader(new FileReader(inputFilePath));
+            List<String[]> lines = c.readAll();
+            lines.removeFirst();
+            for (String[] line : lines) {
+                if (Objects.equals(line[0], this.countryName)) {
+                    res.put(line[1], Integer.parseInt(line[2]));
+                }
+                else if (Objects.equals(line[1], this.countryName)) {
+                    res.put(line[0], Integer.parseInt(line[2]));
+                }
+            }
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        return res;
+    }
+}
diff --git a/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Travel.java b/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Travel.java
new file mode 100644
index 0000000..9302e18
--- /dev/null
+++ b/graphs/java/travel/src/main/java/fr/epita/assistants/travel/Travel.java
@@ -0,0 +1,13 @@
+package fr.epita.assistants.travel;
+
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class Travel {
+    public static void travelTo(Country source, Country destination) {
+        ZonedDateTime t1 = ZonedDateTime.now(source.countryZone);
+        ZonedDateTime t2 = ZonedDateTime.now(destination.countryZone).plusHours(source.travelTimes.get(destination.countryName));
+        System.out.println("Boarding in " + source.countryName + ", local date and time is: " + t1.format(DateTimeFormatter.RFC_1123_DATE_TIME));
+        System.out.println("Landing in " + destination.countryName + ", local date and time on arrival will be: " + t2.format(DateTimeFormatter.RFC_1123_DATE_TIME));
+    }
+}
diff --git a/graphs/java/travel/src/main/resources/travel_times.csv b/graphs/java/travel/src/main/resources/travel_times.csv
new file mode 100644
index 0000000..a6b720b
--- /dev/null
+++ b/graphs/java/travel/src/main/resources/travel_times.csv
@@ -0,0 +1,29 @@
+source,destination,travel_time
+France,Italy,1
+France,England,2
+France,Vietnam,12
+France,Chicago,9
+France,Brazil,12
+France,Egypt,4
+France,Australia,24
+Italy,England,3
+Italy,Vietnam,11
+Italy,Chicago,9
+Italy,Brazil,12
+Italy,Egypt,3
+Italy,Australia,17
+England,Vietnam,12
+England,Chicago,11
+England,Brazil,12
+England,Egypt,5
+England,Australia,21
+Vietnam,Chicago,21
+Vietnam,Brazil,21
+Vietnam,Egypt,17
+Vietnam,Australia,6
+Chicago,Brazil,13
+Chicago,Egypt,13
+Chicago,Australia,21
+Brazil,Egypt,17
+Brazil,Australia,21
+Egypt,Australia,19
\ No newline at end of file
diff --git a/graphs/java/triad/flake.nix b/graphs/java/triad/flake.nix
new file mode 100644
index 0000000..6bf8d07
--- /dev/null
+++ b/graphs/java/triad/flake.nix
@@ -0,0 +1,29 @@
+{
+  description = "Java 2027";
+
+  inputs = {
+    nixpkgs.url      = "github:NixOS/nixpkgs/nixos-24.05";
+    flake-utils.url  = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+      in
+      with pkgs;
+      {
+        devShell = mkShell {
+          buildInputs = [
+            jdk21_headless
+            postgresql
+            quarkus
+            maven
+            nodejs_22
+          ];
+        };
+      }
+    );
+}
diff --git a/graphs/java/triad/pom.xml b/graphs/java/triad/pom.xml
new file mode 100644
index 0000000..66ce68d
--- /dev/null
+++ b/graphs/java/triad/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>triad</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/triad/src/main/java/fr/epita/assistants/triad/FixMyMistake.java b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/FixMyMistake.java
new file mode 100644
index 0000000..b5fa908
--- /dev/null
+++ b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/FixMyMistake.java
@@ -0,0 +1,9 @@
+package fr.epita.assistants.triad;
+
+public class FixMyMistake {
+    public static String myEasyFunction() {
+        // Place your cursor below on aMagicNumber and press Alt+Enter to fix the issue so that the method returns 43
+        final String aMagicNumber = "43";
+        return aMagicNumber;
+    }
+}
diff --git a/graphs/java/triad/src/main/java/fr/epita/assistants/triad/UglyClass.java b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/UglyClass.java
new file mode 100644
index 0000000..75b714d
--- /dev/null
+++ b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/UglyClass.java
@@ -0,0 +1,36 @@
+package fr.epita.assistants.triad;
+
+import java.util.List;
+import java.util.function.Function;
+
+public class UglyClass {
+    public static List<WriteGettersAndConstructorForMe> getMyMessWithParameters() {
+        return myNotSoUsefulMethod();
+    }
+
+    private static List<WriteGettersAndConstructorForMe> myNotSoUsefulMethod() {
+        if (false) {
+            return List.of();
+        } else
+            return List.of(new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne"
+                    , "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false),
+                    new WriteGettersAndConstructorForMe("name", "firstName", "lastName", "random", "anotherOne",
+                            "anotherOne2", "anotherOne3", "xyz", 1, 2.0, 3.0f, true, false)).stream().filter(parameter -> parameter.getName().equals("name")).map(Function.identity()).toList();
+    }
+}
diff --git a/graphs/java/triad/src/main/java/fr/epita/assistants/triad/WriteGettersAndConstructorForMe.java b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/WriteGettersAndConstructorForMe.java
new file mode 100644
index 0000000..794a8f6
--- /dev/null
+++ b/graphs/java/triad/src/main/java/fr/epita/assistants/triad/WriteGettersAndConstructorForMe.java
@@ -0,0 +1,98 @@
+package fr.epita.assistants.triad;
+
+public class WriteGettersAndConstructorForMe {
+    private final String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public String getRandom() {
+        return random;
+    }
+
+    public String getAnotherOne() {
+        return anotherOne;
+    }
+
+    public boolean isC() {
+        return c;
+    }
+
+    public Boolean getB() {
+        return b;
+    }
+
+    public float getZ() {
+        return z;
+    }
+
+    public double getY() {
+        return y;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public String getXyz() {
+        return xyz;
+    }
+
+    public String getAnotherOne3() {
+        return anotherOne3;
+    }
+
+    public String getAnotherOne2() {
+        return anotherOne2;
+    }
+
+    public WriteGettersAndConstructorForMe(String name, String firstName, String lastName, String random, String anotherOne, String anotherOne2, String anotherOne3, String xyz, int x, double y, float z, Boolean b, boolean c) {
+        this.name = name;
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.random = random;
+        this.anotherOne = anotherOne;
+        this.anotherOne2 = anotherOne2;
+        this.anotherOne3 = anotherOne3;
+        this.xyz = xyz;
+        this.x = x;
+        this.y = y;
+        this.z = z;
+        this.b = b;
+        this.c = c;
+    }
+
+    private final String firstName;
+    private final String lastName;
+
+    private final String random;
+
+    private final String anotherOne;
+
+    private final String anotherOne2;
+
+    private final String anotherOne3;
+
+    private final String xyz;
+
+    private final int x;
+
+    private final double y;
+
+    private final float z;
+
+    private final Boolean b;
+
+    private final boolean c;
+
+    // FIXME: Add a constructor with all the parameters and all the getters
+}
diff --git a/graphs/java/war/.gitignore b/graphs/java/war/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/graphs/java/war/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/graphs/java/war/pom.xml b/graphs/java/war/pom.xml
new file mode 100644
index 0000000..99cb248
--- /dev/null
+++ b/graphs/java/war/pom.xml
@@ -0,0 +1,133 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>fr.epita.assistants</groupId>
+    <artifactId>war</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <versions.java>21</versions.java>
+        <versions.junit>5.9.1</versions.junit>
+        <versions.maven-compiler-plugin>3.13.0</versions.maven-compiler-plugin>
+        <versions.maven-surefire-plugin>3.5.0</versions.maven-surefire-plugin>
+        <versions.maven-jar-plugin>3.1.1</versions.maven-jar-plugin>
+        <versions.maven-install-plugin>3.1.0</versions.maven-install-plugin>
+
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <surefire.reportsDirectory>${project.build.directory}/surefire-reports</surefire.reportsDirectory>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${versions.junit}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.surefire</groupId>
+            <artifactId>surefire-junit-platform</artifactId>
+            <version>${versions.maven-surefire-plugin}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-compat</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.9.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-monitor</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-utils</artifactId>
+            <version>3.0.24</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.shared</groupId>
+            <artifactId>maven-filtering</artifactId>
+            <version>3.3.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-interpolation</artifactId>
+            <version>1.13</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-profile</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact-manager</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-registry</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-repository-metadata</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>classworlds</groupId>
+            <artifactId>classworlds</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-commons</artifactId>
+            <version>1.9.3</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${versions.maven-compiler-plugin}</version>
+                <configuration>
+                    <source>${versions.java}</source>
+                    <target>${versions.java}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>${versions.maven-install-plugin}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${versions.maven-surefire-plugin}</version>
+                <configuration>
+                    <reportsDirectory>${surefire.reportsDirectory}</reportsDirectory>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/graphs/java/war/src/main/java/fr/epita/assistants/war/Assassin.java b/graphs/java/war/src/main/java/fr/epita/assistants/war/Assassin.java
new file mode 100644
index 0000000..3415e41
--- /dev/null
+++ b/graphs/java/war/src/main/java/fr/epita/assistants/war/Assassin.java
@@ -0,0 +1,9 @@
+package fr.epita.assistants.war;
+
+public class Assassin extends Soldier{
+    public Assassin() {
+        this.health = 10;
+        this.damage = 9;
+        this.scream = "Out of the shadows!";
+    }
+}
diff --git a/graphs/java/war/src/main/java/fr/epita/assistants/war/Combatant.java b/graphs/java/war/src/main/java/fr/epita/assistants/war/Combatant.java
new file mode 100644
index 0000000..5dc9af4
--- /dev/null
+++ b/graphs/java/war/src/main/java/fr/epita/assistants/war/Combatant.java
@@ -0,0 +1,12 @@
+package fr.epita.assistants.war;
+
+public abstract class Combatant {
+    void printState()
+    {
+        System.err.println("Error 404. Class not found.");
+    }
+
+    abstract void attack(Soldier s);
+    abstract void attack(Vehicle v);
+    abstract void scream();
+}
diff --git a/graphs/java/war/src/main/java/fr/epita/assistants/war/Knight.java b/graphs/java/war/src/main/java/fr/epita/assistants/war/Knight.java
new file mode 100644
index 0000000..1258434
--- /dev/null
+++ b/graphs/java/war/src/main/java/fr/epita/assistants/war/Knight.java
@@ -0,0 +1,9 @@
+package fr.epita.assistants.war;
+
+public class Knight extends Soldier {
+    public Knight() {
+        this.health = 20;
+        this.damage = 5;
+        this.scream = "Be quick or be dead!";
+    }
+}
diff --git a/graphs/java/war/src/main/java/fr/epita/assistants/war/Soldier.java b/graphs/java/war/src/main/java/fr/epita/assistants/war/Soldier.java
new file mode 100644
index 0000000..67c3897
--- /dev/null
+++ b/graphs/java/war/src/main/java/fr/epita/assistants/war/Soldier.java
@@ -0,0 +1,38 @@
+package fr.epita.assistants.war;
+
+public class Soldier extends Combatant {
+    int health;
+    int damage;
+    String scream;
+
+    public Soldier() {
+        this.health = 15;
+        this.damage = 3;
+        this.scream = "No pity for losers!";
+    }
+
+    public void kill(){
+        this.health = 0;
+    }
+
+    @Override
+    public void printState()
+    {
+        System.out.println("I have " + this.health + " health points.");
+    }
+
+    @Override
+    public void attack(Soldier s) {
+        s.health -= this.damage;
+    }
+
+    @Override
+    public void attack(Vehicle v) {
+        System.out.println("I can't fight this.");
+    }
+
+    @Override
+    public void scream() {
+        System.out.println(this.scream);
+    }
+}
diff --git a/graphs/java/war/src/main/java/fr/epita/assistants/war/Vehicle.java b/graphs/java/war/src/main/java/fr/epita/assistants/war/Vehicle.java
new file mode 100644
index 0000000..b27d072
--- /dev/null
+++ b/graphs/java/war/src/main/java/fr/epita/assistants/war/Vehicle.java
@@ -0,0 +1,32 @@
+package fr.epita.assistants.war;
+
+public class Vehicle extends Combatant{
+    String name;
+    int defense;
+
+    public Vehicle(String name, int defense) {
+        this.name = name;
+        this.defense = defense;
+    }
+
+    @Override
+    public void printState()
+    {
+        System.out.println("I have " + this.defense + " defense points.");
+    }
+
+    @Override
+    public void attack(Soldier s) {
+        s.kill();
+    }
+
+    @Override
+    public void attack(Vehicle v) {
+        v.defense /= 2;
+    }
+
+    @Override
+    public void scream() {
+        System.out.println("I'm " + this.name + "!");
+    }
+}
diff --git a/graphs/js/.gitignore b/graphs/js/.gitignore
new file mode 100644
index 0000000..afb8184
--- /dev/null
+++ b/graphs/js/.gitignore
@@ -0,0 +1,54 @@
+*.tar
+main.js
+package.json
+node_modules/
+yarn.lock
+package-lock.json
+
+# IDEs and editors
+.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Dependency directories
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# System Files
+.DS_Store
+Thumbs.db
+
+# Lint and formatter
+.prettierrc.js
+eslint.config.mjs
diff --git a/graphs/js/.prettierrc.cjs b/graphs/js/.prettierrc.cjs
new file mode 100644
index 0000000..fcc77f6
--- /dev/null
+++ b/graphs/js/.prettierrc.cjs
@@ -0,0 +1,6 @@
+module.exports = {
+    tabWidth: 4,
+    useTabs: false, // Use spaces instead of defaults tabs
+    semi: true, // Force semilicons
+    printWidth: 80, // Max width
+};
diff --git a/graphs/js/accountConstraints/account.js b/graphs/js/accountConstraints/account.js
new file mode 100644
index 0000000..4a3ddbe
--- /dev/null
+++ b/graphs/js/accountConstraints/account.js
@@ -0,0 +1,42 @@
+"use strict";
+
+const {
+    InvalidUsernameError,
+    InvalidPasswordError,
+    InvalidYearOfBirthError,
+} = require("./accountError");
+
+class Account {
+    // FIXME DONE: A constructor was deleted here
+    constructor(username, password, yearOfBirth) {
+        const regUsername = /^[a-zA-Z0-9\-_]+$/;
+        const lower = /[a-z]/;
+        const upper = /[A-Z]/;
+        const digits = /[0-9]/;
+
+        if (!regUsername.test(username)) {
+            throw new InvalidUsernameError("Invalid username.");
+        }
+
+        this.username = username;
+        if (
+            !password.match(lower) ||
+            !password.match(upper) ||
+            !password.match(digits) ||
+            password.length < 8 ||
+            password.length > 100
+        ) {
+            throw new InvalidPasswordError("Invalid password.");
+        }
+
+        this.password = password;
+        if (yearOfBirth <= 1800 || yearOfBirth > new Date().getFullYear()) {
+            throw new InvalidYearOfBirthError("Invalid birth year");
+        }
+
+        this.yearOfBirth = yearOfBirth;
+    }
+}
+module.exports = {
+    Account,
+};
diff --git a/graphs/js/accountConstraints/accountError.js b/graphs/js/accountConstraints/accountError.js
new file mode 100644
index 0000000..9b427e0
--- /dev/null
+++ b/graphs/js/accountConstraints/accountError.js
@@ -0,0 +1,23 @@
+class InvalidUsernameError extends Error {
+    name = "InvalidUsernameError";
+    constructor(message) {
+        super("Invalid username: " + message);
+    }
+}
+class InvalidPasswordError extends Error {
+    name = "InvalidPasswordError";
+    constructor(message) {
+        super("Invalid password: " + message);
+    }
+}
+class InvalidYearOfBirthError extends Error {
+    name = "InvalidYearOfBirthError";
+    constructor(message) {
+        super("Invalid birth year: " + message);
+    }
+}
+module.exports = {
+    InvalidPasswordError,
+    InvalidUsernameError,
+    InvalidYearOfBirthError,
+};
diff --git a/graphs/js/advancedCommunication/client.js b/graphs/js/advancedCommunication/client.js
new file mode 100644
index 0000000..7c051a8
--- /dev/null
+++ b/graphs/js/advancedCommunication/client.js
@@ -0,0 +1,26 @@
+const WebSocket = require("ws");
+
+function addClient(userName) {
+    const socket = new WebSocket("ws://localhost:8080?username=" + userName);
+
+    socket.on("open", () => {
+        socket.send(userName + ": trying to establish connection");
+    });
+    socket.on("close", (code, reason) => {
+        console.log(
+            "<server to " +
+                userName +
+                ">: Connection has been closed: [" +
+                code +
+                "] " +
+                reason,
+        );
+    });
+    socket.on("message", (data) => {
+        console.log("<server to " + userName + ">: " + data);
+    });
+    return socket;
+}
+module.exports = {
+    addClient,
+};
diff --git a/graphs/js/advancedCommunication/server.js b/graphs/js/advancedCommunication/server.js
new file mode 100644
index 0000000..e642396
--- /dev/null
+++ b/graphs/js/advancedCommunication/server.js
@@ -0,0 +1,88 @@
+const WebSocket = require("ws");
+
+function startServer() {
+    const server = new WebSocket.Server({ port: 8080 });
+    const connections = new Array();
+    let maxID = 0;
+
+    console.log("Websocket server is running on port 8080.");
+    server.on("connection", (socket, request) => {
+        const userName = request.url.substring(11);
+
+        maxID++;
+        const current_connection = {
+            userName: userName,
+            id: maxID,
+            socket: socket,
+        };
+
+        socket.on("message", (data) => {
+            console.log("[" + current_connection.id + "] " + data);
+        });
+        socket.on("close", (code, reason) => {
+            console.log(
+                "[" +
+                    current_connection.id +
+                    "] Disconnected: [" +
+                    code +
+                    "] " +
+                    reason,
+            );
+            if (code !== 1008) {
+                for (const conn of connections) {
+                    if (conn.id !== current_connection.id) {
+                        conn.socket.send(userName + " disconnected");
+                    }
+                }
+
+                connections.splice(connections.indexOf(current_connection), 1);
+            }
+        });
+        for (const conn of connections) {
+            if (conn.userName === userName) {
+                socket.close(
+                    1008,
+                    'Username: "' + userName + '" is already taken',
+                );
+                return;
+            }
+        }
+
+        socket.send("Welcome " + userName);
+        connections.push(current_connection);
+        if (connections.length === 1) {
+            socket.send(userName + ", you are the only player connected");
+        } else {
+            socket.send(connections.length + " players are connected");
+        }
+
+        for (const conn of connections) {
+            if (conn.userName !== userName) {
+                conn.socket.send(userName + " connected");
+            }
+        }
+
+        if (connections.length < 4) {
+            for (const conn of connections) {
+                conn.socket.send(
+                    "Waiting for " +
+                        (4 - connections.length) +
+                        " other players to start the game",
+                );
+            }
+        } else {
+            for (const conn of connections) {
+                conn.socket.send(
+                    "Match will start soon, disconnecting " +
+                        conn.userName +
+                        " from the lobby",
+                );
+                conn.socket.close(1000, "Match is starting");
+            }
+        }
+    });
+    return server;
+}
+module.exports = {
+    startServer,
+};
diff --git a/graphs/js/armstrongNumber/armstrongNumber.js b/graphs/js/armstrongNumber/armstrongNumber.js
new file mode 100644
index 0000000..59da441
--- /dev/null
+++ b/graphs/js/armstrongNumber/armstrongNumber.js
@@ -0,0 +1,17 @@
+function armstrongNumber(number) {
+    if (number < 0 || number == null || number == undefined) {
+        return false;
+    }
+
+    const ndigits = number.toString().length;
+    let sum = 0;
+
+    for (let i = 0; i < ndigits; i++) {
+        sum = sum + number.toString()[i] ** ndigits;
+    }
+
+    return sum === number;
+}
+module.exports = {
+    armstrongNumber,
+};
diff --git a/graphs/js/coordinatesDisplay/coordinates.js b/graphs/js/coordinatesDisplay/coordinates.js
new file mode 100644
index 0000000..845599f
--- /dev/null
+++ b/graphs/js/coordinatesDisplay/coordinates.js
@@ -0,0 +1,123 @@
+/**
+ * Retrieves the width of the map.
+ * @returns {Promise<any>} A promise that resolves when the width is retrieved.
+ */
+const getMapWidth = async () => {
+    const res = await fetch("http://localhost:2707/mapWidth");
+
+    return res.json();
+};
+
+/**
+ * Fetches the bit at the specified index from the server.
+ * @param {number} i - The index of the bit to fetch.
+ * @returns {Promise} - A promise that resolves with the fetched bit.
+ */
+const getMapPiece = async (i) => {
+    const res = await fetch(`http://localhost:2707/piece/${i}`);
+
+    return res.json();
+};
+
+/**
+ * Creates a grid element with the specified map width.
+ * @param {number} mapWidth - The width of the map.
+ */
+
+function createGrid(mapWidth) {
+    const div = document.createElement("div");
+
+    div.id = "asyncGrid";
+    div.style.display = "grid";
+    div.style.gridTemplateColumns = `repeat(${mapWidth}, 1fr)`;
+    div.style.gridTemplateRows = `repeat(${mapWidth}, 1fr)`;
+    div.style.width = "fit-content";
+    div.style.height = "fit-content";
+    document.body.appendChild(div);
+}
+
+/**
+ * Displays an SVG element asynchronously at the specified coordinates.
+ *
+ * @param {string} svg - The SVG element to be displayed.
+ * @param {number} x - The x-coordinate of the grid cell where the SVG element will be displayed.
+ * @param {number} y - The y-coordinate of the grid cell where the SVG element will be displayed.
+ */
+async function displayPiece(svg, x, y) {
+    const svgElement = document.createElement("div");
+
+    svgElement.innerHTML = svg;
+
+    const width = svgElement.lastChild.getAttribute("width");
+    const height = svgElement.lastChild.getAttribute("height");
+
+    svgElement.style.width = `${width}px`;
+    svgElement.style.height = `${height}px`;
+    svgElement.style.gridColumn = x + 1;
+    svgElement.style.gridRow = y + 1;
+    svgElement.style.padding = 0;
+    svgElement.style.margin = 0;
+    document.getElementById("asyncGrid").appendChild(svgElement);
+}
+
+async function displayMap() {
+    // FIXME !
+
+    const startTime = Date.now();
+    const width = await getMapWidth();
+
+    createGrid(width);
+    const promises = new Array();
+
+    for (let i = 0; i < width * width; i++) {
+        promises.push(
+            getMapPiece(i).then(async (piece) => {
+                await displayPiece(piece.svg, piece.x, piece.y);
+            }),
+        );
+    }
+
+    await Promise.all(promises);
+    return Date.now() - startTime;
+    /*return new Promise((resolve, reject) => {
+        resolve(getMapWidth);
+    })
+        .then((width) => {
+            createGrid(width);
+            let promises = new Array();
+            for (let i = 0; i < width * width; i++) {
+                promises.push(
+                    new Promise((resolve) => {
+                        resolve(getMapPiece(i));
+                    }).then((piece) => {
+                        displayPiece(piece.svg, piece.x, piece.y);
+                    }),
+                );
+            }
+            Promise.all(promises);
+            return Date.now() - startTime;
+        })
+        .catch((error) => error);*/
+    // don't forget you can use above functions to help you and also make your own
+}
+
+// Your code goes here, the html page will load your script and launch it
+// Catch errors if you push your testing code so the Moulinette doesn't fail
+displayMap()
+    .then((time) => {
+        console.log("displayed in " + time + " ms.");
+    })
+    .catch((error) => {
+        console.error(error);
+    });
+
+// As always, we need to export the displayMap function for the tests.
+// To avoid errors in browsers (where "module" is not defined),
+// we wrap the exports inside a conditional check to ensure they
+// are only assigned when the code is running in a Node.js environment.
+
+if (typeof window === "undefined") {
+    module.exports = {
+        displayMap,
+    };
+}
diff --git a/graphs/js/coordinatesDisplay/index.html b/graphs/js/coordinatesDisplay/index.html
new file mode 100644
index 0000000..d2bf830
--- /dev/null
+++ b/graphs/js/coordinatesDisplay/index.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>

+<html>

+<head>

+    <title>Async Display</title>

+    <meta charset="utf-8" />

+    <style type="text/css">

+        #asyncGrid {

+            width: 100px;

+            height: 100px;

+            border: 1px solid black;

+            position: absolute;

+            top: calc(50% - 250px); 

+            left: calc(50% - 250px);      

+        }

+    </style>

+</head>

+<body>

+    <script type="text/javascript" src="coordinates.js"></script>

+</body>

+</html>

diff --git a/graphs/js/coordinatesDisplay/resources/logo.svg b/graphs/js/coordinatesDisplay/resources/logo.svg
new file mode 100755
index 0000000..14ac718
--- /dev/null
+++ b/graphs/js/coordinatesDisplay/resources/logo.svg
@@ -0,0 +1,63 @@
+<?xml version="1.0"?>
+<svg width="500" height="500" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" version="1.1" xml:space="preserve">
+ <defs id="defs1">
+  <rect height="282.09" id="rect1495" width="465.07" x="1074" y="960"/>
+  <rect height="98.99" id="rect1494" width="995.61" x="-531.74" y="1004.09"/>
+  <rect height="45.25" id="rect1493" width="135.76" x="1216.22" y="873.98"/>
+  <rect height="85" id="rect26" width="124" x="366" y="794"/>
+  <rect height="88" id="rect23" width="455" x="137" y="792"/>
+  <rect height="105" id="rect22" width="490" x="98" y="816"/>
+  <rect height="217.05" id="rect2" width="774.19" x="200.65" y="788.82"/>
+  <clipPath clipPathUnits="userSpaceOnUse" id="clipPath56">
+   <g id="use56"/>
+  </clipPath>
+  <mask id="mask56" maskUnits="userSpaceOnUse">
+   <rect fill="#a72424" height="26.46" id="rect56" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.31" width="44.08" x="45.01" y="246.55"/>
+  </mask>
+  <clipPath clipPathUnits="userSpaceOnUse" id="clipPath67">
+   <g id="use67">
+    <rect fill="#a72424" height="38.1" id="rect67" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.31" width="44.08" x="31.12" y="258.72"/>
+    <rect fill="#a72424" height="37.31" id="rect68" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.31" width="42.75" x="52.76" y="242.31"/>
+    <rect fill="#a72424" height="22.82" id="rect69" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.31" width="48.36" x="64.4" y="264.54"/>
+   </g>
+  </clipPath>
+  <rect height="217.05" id="rect1489" width="774.19" x="200.65" y="788.82"/>
+  <rect height="217.05" id="rect1490" width="774.19" x="200.65" y="788.82"/>
+  <rect height="217.05" id="rect1491" width="774.19" x="200.65" y="788.82"/>
+ </defs>
+ <g class="layer" display="inline">
+  <title>Layer 1</title>
+  <g display="none" id="layer1">
+   <rect display="none" fill="#000000" height="210.01" id="rect46" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2.3" width="171.45" x="20.33" y="28.36"/>
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+  </g>
+ </g>
+</svg>
\ No newline at end of file
diff --git a/graphs/js/coordinatesDisplay/server.js b/graphs/js/coordinatesDisplay/server.js
new file mode 100644
index 0000000..45b7fed
--- /dev/null
+++ b/graphs/js/coordinatesDisplay/server.js
@@ -0,0 +1,92 @@
+// svg image server
+const express = require("express");
+const cors = require("cors");
+const DOMParser = require("xmldom").DOMParser;
+const XMLSerializer = require("xmldom").XMLSerializer;
+const fs = require("fs");
+
+const app = express();
+
+app.use(cors());
+
+app.use(express.static("public"));
+
+app.listen(2707, () => {
+    console.log("Server listening on port 2707 👂");
+});
+
+const sidePiecesCount = 20; // size has to odd to make the puzzle solvable
+
+app.get("/mapWidth", (req, res) => {
+    res.json(sidePiecesCount);
+});
+
+const parser = new DOMParser();
+
+const svgText = fs.readFileSync(__dirname + "/resources/logo.svg", "utf8");
+const svg = parser.parseFromString(svgText, "image/svg+xml");
+
+const width = svg.documentElement.getAttribute("width");
+const height = svg.documentElement.getAttribute("height");
+
+const gridSideSize = Math.max(width, height);
+
+const pieceSize = gridSideSize / sidePiecesCount;
+
+const piecesMap = new Array(sidePiecesCount * sidePiecesCount);
+
+for (let x = 0; x < sidePiecesCount; x++) {
+    for (let y = 0; y < sidePiecesCount; y++) {
+        const piece = svg.cloneNode(true);
+
+        piece.documentElement.setAttribute(
+            "viewBox",
+            `${x * pieceSize} ${y * pieceSize} ${pieceSize} ${pieceSize}`,
+        ); // ATTENTION : this method is really slow, in real life cases you should really cut the image and not send it with information on where to crop it
+        piece.documentElement.setAttribute("width", `${pieceSize}`);
+        piece.documentElement.setAttribute("height", `${pieceSize}`);
+        const svgString = new XMLSerializer().serializeToString(piece);
+
+        piecesMap[x + y * sidePiecesCount] = {
+            svg: svgString,
+            x: x,
+            y: y,
+        };
+    }
+}
+
+const shuffledCoordinates = Array.from(
+    Array(sidePiecesCount * sidePiecesCount).keys(),
+);
+
+const swap = (a, i, j) => {
+    const tmp = a[i];
+
+    a[i] = a[j];
+    a[j] = tmp;
+};
+
+const shuffle = (a) => {
+    let i = a.length - 1;
+
+    while (i > 0) {
+        const j = Math.floor(Math.random() * i);
+
+        swap(a, i, j);
+        i--;
+    }
+};
+
+shuffle(shuffledCoordinates);
+
+console.log("Coordinates shuffled ! 🥳");
+console.log("now serving on port 2707. 🫡");
+
+for (let x = 0; x < shuffledCoordinates.length; x++) {
+    app.get(`/piece/${x}`, (req, res) => {
+        console.log(`piece ${x} requested 🤖`);
+        res.send(piecesMap[shuffledCoordinates[x]]);
+    });
+}
+
+exports.app = app;
diff --git a/graphs/js/counter/counter.js b/graphs/js/counter/counter.js
new file mode 100644
index 0000000..89198de
--- /dev/null
+++ b/graphs/js/counter/counter.js
@@ -0,0 +1,12 @@
+const counter = document.getElementById("count");
+let counterVal = parseInt(counter.innerHTML);
+const btnPlus = document.getElementById("plus");
+const btnMinus = document.getElementById("minus");
+
+btnPlus.addEventListener("click", () => {
+    counter.innerHTML = ++counterVal;
+});
+
+btnMinus.addEventListener("click", () => {
+    counter.innerHTML = --counterVal;
+});
diff --git a/graphs/js/counter/index.html b/graphs/js/counter/index.html
new file mode 100644
index 0000000..d088aac
--- /dev/null
+++ b/graphs/js/counter/index.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="style.css">
+    <script defer src="counter.js"></script>
+    <title>My Super Counter</title>
+</head>
+<body>
+    <div class="container">
+        <div id="count">0</div>
+        <div class="actions">
+            <button id="plus">+</button>
+            <button id="minus">-</button>
+        </div>
+    </div>
+</body>
+</html>
diff --git a/graphs/js/counter/style.css b/graphs/js/counter/style.css
new file mode 100644
index 0000000..677acc2
--- /dev/null
+++ b/graphs/js/counter/style.css
@@ -0,0 +1,31 @@
+html,
+body {
+  height: 100%;
+}
+
+.container {
+  height: 100%;
+  display: flex;
+  justify-content: center;
+  flex-direction: column;
+  align-items: center;
+}
+
+#count {
+  font-size: 20vh;
+}
+
+.actions {
+  display: flex;
+  height: 10vh;
+}
+
+.actions > button {
+  width: 10vw;
+  background-color: rgb(0, 132, 255);
+  font-size: 5vh;
+}
+
+#plus {
+  margin-right: 20px;
+}
diff --git a/graphs/js/deepCopyAndEquality/deepCopyAndEquality.js b/graphs/js/deepCopyAndEquality/deepCopyAndEquality.js
new file mode 100644
index 0000000..4a67b6b
--- /dev/null
+++ b/graphs/js/deepCopyAndEquality/deepCopyAndEquality.js
@@ -0,0 +1,41 @@
+function deepCopy(x) {
+    if (x == null || x == undefined) {
+        return x;
+    } else if (x instanceof Date) {
+        return new Date(x.valueOf());
+    } else if (x instanceof Array) {
+        const res = new Array();
+
+        x.forEach((element) => res.push(deepCopy(element)));
+        return res;
+    } else if (typeof x === "object") {
+        const res = {};
+
+        for (const prop in x) {
+            res[prop] = deepCopy(x[prop]);
+        }
+
+        const sort = (o) =>
+            Object.keys(o)
+                .sort()
+                .reduce((final, key) => {
+                    final[key] = o[key];
+                    return final;
+                }, {});
+
+        return sort(res);
+    } else {
+        return x;
+    }
+}
+function deepEquality(a, b) {
+    if (typeof a !== typeof b) {
+        return false;
+    }
+
+    return JSON.stringify(deepCopy(a)) === JSON.stringify(deepCopy(b));
+}
+module.exports = {
+    deepCopy,
+    deepEquality,
+};
diff --git a/graphs/js/epiTinder/data.json b/graphs/js/epiTinder/data.json
new file mode 100644
index 0000000..cd325a5
--- /dev/null
+++ b/graphs/js/epiTinder/data.json
@@ -0,0 +1,118 @@
+{
+    "users": [
+        {
+            "id": 0,
+            "name": "Puff",
+            "age": 2,
+            "description": "I like everyone who does javascript (I'm the mascot of the workshop)"
+        },
+        {
+            "id": 1,
+            "name": "Bubble",
+            "age": 1,
+            "description": "I'm the real javascript mascot but don't tell puff he'll cry again"
+        },
+        {
+            "id": 2,
+            "name": "Maxime Buisson",
+            "age": 40,
+            "description": "I already have my other half but I want to make friends."
+        },
+        {
+            "id": 3,
+            "name": "Dorian Penso",
+            "age": 25,
+            "description": "Gym enthusiast by day, code lover by night, seeking a partner to write code and lift weights together."
+        },
+        {
+            "id": 4,
+            "name": "Pierre-Alexis Valbrun",
+            "age": 32,
+            "description": "I'm a full-stack developer, I can handle both your front-end and back-end."
+        },
+        {
+            "id": 5,
+            "name": "Paul Genillon",
+            "age": 26,
+            "description": "It’s not humid.. it’s raining"
+        },
+        {
+            "id": 6,
+            "name": "Botumrath Morchoisne",
+            "age": 24,
+            "description": "What am I doing here??"
+        },
+        {
+            "id": 7,
+            "name": "Pierre Santamaria",
+            "age": 22,
+            "description": "I'll love you like I love JavaScript, I won't get anything you tell me but it'll be passionate."
+        },
+        {
+            "id": 8,
+            "name": "Baptiste Schaudel",
+            "age": 9,
+            "description": "I am operational to manage my team, I will let you discover if I am too with love."
+        },
+        {
+            "id": 9,
+            "name": "Maxim Payeur",
+            "age": 8,
+            "description": "I lost my e, can you help me find it."
+        },
+        {
+            "id": 10,
+            "name": "Vinh-Toan Phan",
+            "age": 17,
+            "description": "I'm an excelent cooker, do you want to be my cookware."
+        },
+        {
+            "id": 11,
+            "name": "Angelina Kuntz",
+            "age": 44,
+            "description": "You can call me Ada"
+        },
+        {
+            "id": 12,
+            "name": "Ewan Lemonnier",
+            "age": 19,
+            "description": "Barely legal"
+        },
+        {
+          "id": 13,
+          "name": "Anaïs Druelle",
+          "age": 21,
+          "description": "What's the only part of a vegetable you can't eat?"  
+        },
+        {
+            "id": 14,
+            "name": "Mathéo Romé",
+            "age": 22,
+            "description": "I can’t sing but I will charm you anyway"
+        },
+        {
+            "id": 15,
+            "name": "Noé Bauvineau",
+            "age": 58,
+            "description": "Searching for someone who can appreciate the elegance of a well-designed API."
+        },
+        {
+            "id": 16,
+            "name": "Vincent Thirouin",
+            "age": 39,
+            "description": "I may not be able to dance, but I can sure write some smooth code."
+        },
+        {
+            "id": 17,
+            "name": "Thibault Viennot",
+            "age": 30,
+            "description": "Searching for someone who knows how to have fun while debugging"
+        },
+        {
+            "id": 18,
+            "name": "Pauline Chautard",
+            "age": 22,
+            "description": "I'm like a compiler, I can take your high-level needs and turn them into low-level satisfaction."
+        }
+    ]
+}
\ No newline at end of file
diff --git a/graphs/js/epiTinder/epiTinder.js b/graphs/js/epiTinder/epiTinder.js
new file mode 100644
index 0000000..881a2c8
--- /dev/null
+++ b/graphs/js/epiTinder/epiTinder.js
@@ -0,0 +1,114 @@
+const fs = require("fs");
+const express = require("express");
+
+function readUsersFromJSONFile(JSON_filename) {
+    /*
+     ** Return the list of users stored in the JSON file
+     ** JSON_filename: path to the JSON file
+     */
+    const content = fs.readFileSync(JSON_filename, (err) => {
+        if (err) {
+            console.error(err);
+            return;
+        }
+    });
+
+    return JSON.parse(content).users;
+}
+
+function writeUsersToJSONFile(JSON_filename, users) {
+    /*
+     ** Overwrite the given JSON_filename with the given
+     ** list of users.
+     ** JSON_filename: path to the JSON file
+     ** users : list of users objects
+     */
+    const usersJSON = JSON.stringify({ users: users });
+
+    fs.writeFileSync(JSON_filename, usersJSON, (err) => {
+        if (err) {
+            console.error(err);
+            return;
+        }
+    });
+}
+function epiTinderWebServer(host, port, filename) {
+    const app = express();
+
+    app.use(express.json());
+    const users = readUsersFromJSONFile(filename);
+    let maxID = 0;
+
+    if (users.length > 0) {
+        maxID = Math.max(...users.map((e) => e.id)) + 1;
+    }
+
+    app.get("/", (req, res) => {
+        res.status(200).send({ message: "Hello World!" });
+    });
+    app.get("/users", (req, res) => {
+        res.status(200).send(users);
+    });
+    app.post("/users", (req, res) => {
+        const new_user = {
+            id: maxID++,
+            name: req.body.name,
+            age: req.body.age,
+            description: req.body.description,
+        };
+
+        users.push(new_user);
+        writeUsersToJSONFile(filename, users);
+        res.status(201).send(new_user);
+    });
+    app.get("/users/:id", (req, res) => {
+        const u = users.find((e) => e.id == req.params.id);
+
+        if (u == undefined) {
+            res.status(404).send({
+                message: `No user with id: ${req.params.id} found`,
+            });
+        } else {
+            res.status(200).send(u);
+        }
+    });
+    app.put("/users/:id", (req, res) => {
+        const u = users.findIndex((e) => e.id == req.params.id);
+
+        if (u == -1) {
+            res.status(404).send({
+                message: `No user with id: ${req.params.id} found`,
+            });
+        } else {
+            users[u].name = req.body.name;
+            users[u].age = req.body.age;
+            users[u].description = req.body.description;
+            writeUsersToJSONFile(filename, users);
+            res.status(201).send(users[u]);
+        }
+    });
+    app.delete("/users/:id", (req, res) => {
+        const u = users.findIndex((e) => e.id == req.params.id);
+
+        if (u == -1) {
+            res.status(404).send({
+                message: `No user with id: ${req.params.id} found`,
+            });
+        } else {
+            const usr = users[u];
+
+            users.splice(u, 1);
+            writeUsersToJSONFile(filename, users);
+            res.status(200).send(usr);
+        }
+    });
+    app.get("*", (req, res) => {
+        res.status(404).send({ message: "Not found" });
+    });
+    return app.listen(port, () => {
+        console.log("Server running at http://" + host + ":" + port + "/");
+    });
+}
+module.exports = {
+    epiTinderWebServer,
+};
diff --git a/graphs/js/epiTinderDB/epiTinderDB.js b/graphs/js/epiTinderDB/epiTinderDB.js
new file mode 100644
index 0000000..d9f35a8
--- /dev/null
+++ b/graphs/js/epiTinderDB/epiTinderDB.js
@@ -0,0 +1,204 @@
+const { Sequelize, Op, DataTypes } = require("sequelize");
+
+let seq = null;
+let userModel = null;
+
+async function connectToDB() {
+    if (!seq) {
+        seq = new Sequelize(
+            "postgres",
+            process.env.USERNAME,
+            process.env.PASSWORD,
+            {
+                port: 5432,
+                dialect: "postgres",
+            },
+        );
+    }
+
+    if (!userModel) {
+        userModel = seq.define(
+            "epitinder_users",
+            {
+                name: {
+                    type: DataTypes.STRING,
+                },
+                age: {
+                    type: DataTypes.INTEGER,
+                },
+                description: {
+                    type: DataTypes.STRING,
+                },
+            },
+            {
+                // Other model options go here
+                timestamps: false,
+            },
+        );
+    }
+
+    return seq;
+}
+
+async function getAllUsers() {
+    return userModel.findAll({
+        attributes: ["id", "name", "age", "description"],
+        raw: true,
+    });
+}
+
+async function getUser(id) {
+    return userModel
+        .findOne({
+            attributes: ["id", "name", "age", "description"],
+            where: { id: id },
+            raw: true,
+        })
+        .catch(() => {
+            return null;
+        });
+}
+
+async function addUser(newUser) {
+    if (
+        newUser["id"] ||
+        !newUser["name"] ||
+        !newUser["age"] ||
+        !newUser["description"]
+    ) {
+        return null;
+    }
+
+    return userModel
+        .create({
+            name: newUser.name,
+            age: newUser.age,
+            description: newUser.description,
+        })
+        .then((usr) => usr.dataValues)
+        .catch(() => null);
+}
+async function updateUser(user) {
+    if (
+        !user["id"] ||
+        !user["name"] ||
+        !user["age"] ||
+        !user["description"] ||
+        Object.keys(user).length > 4
+    ) {
+        return null;
+    }
+
+    const res = await userModel
+        .findOne({
+            where: { id: user.id },
+            raw: true,
+        })
+        .catch(() => null);
+
+    if (!res) {
+        return null;
+    }
+
+    await userModel
+        .update(
+            {
+                name: user.name,
+                age: user.age,
+                description: user.description,
+            },
+            {
+                where: { id: user.id },
+                raw: true,
+            },
+        )
+        .catch(() => null);
+    return user;
+}
+
+async function deleteUser(id) {
+    let res = await userModel
+        .findOne({
+            where: { id: id },
+            raw: true,
+        })
+        .catch(() => null);
+
+    if (!res) {
+        return null;
+    }
+
+    res = {
+        id: res.id,
+        name: res.name,
+        age: res.age,
+        description: res.description,
+    };
+    await userModel.destroy({ where: { id: id } });
+    return res;
+}
+
+async function getAllUsersName() {
+    return userModel
+        .findAll({
+            attributes: ["name"],
+            raw: true,
+        })
+        .catch(() => {
+            return null;
+        });
+}
+
+async function getAllYoungAdults() {
+    return userModel
+        .findAll({
+            where: {
+                age: {
+                    [Op.between]: [18, 29],
+                },
+            },
+            raw: true,
+        })
+        .catch(() => {
+            return null;
+        });
+}
+
+module.exports = {
+    getAllUsers,
+    getAllUsersName,
+    getAllYoungAdults,
+    getUser,
+    addUser,
+    deleteUser,
+    updateUser,
+    connectToDB,
+};
+
+async function main() {
+    await connectToDB();
+    //console.log(await getAllUsers());
+    //console.log(await getAllUsersName());
+    //console.log(await getAllYoungAdults());
+    //console.log(await getUser(5));
+    /*console.log(
+        await addUser({
+            name: "Martial Simon",
+            age: 19,
+            description: "Sex is like pointers, I like it raw",
+        }),
+    );*/
+    console.log(
+        await updateUser({
+            id: 56,
+            name: "Mickael Razzouk",
+            age: 21,
+            sex_appeal: 100,
+            description: "Le goat",
+        }),
+    );
+    //console.log(await getUser(5));
+    //console.log(await deleteUser(23));
+}
+
+main();
diff --git a/graphs/js/epiTinderDB/provided.sql b/graphs/js/epiTinderDB/provided.sql
new file mode 100644
index 0000000..81d65da
--- /dev/null
+++ b/graphs/js/epiTinderDB/provided.sql
@@ -0,0 +1,17 @@
+CREATE TABLE epitinder_users (id SERIAL PRIMARY KEY, name VARCHAR(255), age INT, description VARCHAR(255));
+
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Puff',2, 'I like everyone who does javascript (I m the mascot of the workshop)');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Bubble',1, 'I m the real javascript mascot but don t tell puff he ll cry again');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Maxime Buisson',40, 'I already have my other half but I want to make friends.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Dorian Penso',25, 'Gym enthusiast by day, code lover by night, seeking a partner to write code and lift weights together.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Pierre-Alexis Valbrun',32, 'I m a full-stack developer, I can handle both your front-end and back-end.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Paul Genillon',21, 'It is not compiling since it is a wooclap.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Botumrath Morchoisne',24, 'What am I doing here ??');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Pierre Santamaria',22, 'I will love you like I love JavaScript, I won t get anything you tell me but it will be passionate.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Baptiste Schaudel',9, 'I am operational to manage my team, I will let you discover if I am too with love.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Maxim Payeur',8, 'What am I doing here ??');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Vinh-Toan Phan',17, 'I am an excelent cooker, do you want to be my cookware.');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Angelina Kuntz',44, 'You can call me Ada');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Ewan Lemonnier',19, 'Barely legal');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Anaïs Druelle',21, 'What is the only part of a vegetable you can t eat?');
+INSERT INTO epitinder_users (name, age, description) VALUES  ('Mathéo Romé',22, 'I can’t sing but I will charm you anyway');
\ No newline at end of file
diff --git a/graphs/js/eslint/fibo.js b/graphs/js/eslint/fibo.js
new file mode 100644
index 0000000..9b466e7
--- /dev/null
+++ b/graphs/js/eslint/fibo.js
@@ -0,0 +1,31 @@
+function fibo(n) {
+    // I'm a comment
+    if (typeof n != "number" || isNaN(n)) {
+        return -1;
+    }
+
+    if (n < 0) {
+        return -1;
+    }
+
+    if (n === 0) {
+        return 0;
+    }
+
+    let a = 1;
+
+    let b = 1;
+    let result = 1;
+
+    for (let i = 2; i < n; i++) {
+        result = a + b;
+        b = a;
+        a = result;
+    }
+
+    return result;
+}
+
+module.exports = {
+    fibo,
+};
diff --git a/graphs/js/foodTruck/data.js b/graphs/js/foodTruck/data.js
new file mode 100644
index 0000000..dab9982
--- /dev/null
+++ b/graphs/js/foodTruck/data.js
@@ -0,0 +1,70 @@
+"use strict";
+
+const stocks = {
+    mozzarella: 4,
+    parmesan: 5,
+    cheddar: 6,
+    "goat cheese": 7,
+    meat: 3,
+    chicken: 4,
+    salmon: 7,
+    tuna: 8,
+    bacon: 4,
+    mushrooms: 4,
+    tomato: 5,
+    "tomato sauce": 5,
+    "sour cream": 5,
+    fries: 20,
+    eggs: 10,
+    buns: 20,
+    lettuce: 5,
+    oregano: 8,
+};
+
+const recipes = {
+    pizza: {
+        Margarita: {
+            cheese: {
+                mozzarella: 4,
+            },
+            sauce: "tomato sauce",
+            toppings: { oregano: 2 },
+        },
+        "4 cheese": {
+            cheese: {
+                mozzarella: 2,
+                parmesan: 2,
+                cheddar: 2,
+                "goat cheese": 2,
+            },
+            toppings: { oregano: 2 },
+            sauce: "tomato sauce",
+        },
+        "Creamy 4 cheese": {
+            cheese: {
+                mozzarella: 2,
+                parmesan: 2,
+                cheddar: 2,
+                "goat cheese": 2,
+            },
+            toppings: { oregano: 2 },
+            sauce: "sour cream",
+        },
+    },
+    burger: {
+        Whoopty: { cheddar: 2, meat: 2, lettuce: 2, tomato: 2, buns: 2 },
+        McChicken: { cheddar: 2, chicken: 1, lettuce: 2, buns: 2 },
+    },
+};
+
+if (typeof window === "undefined") {
+    module.exports = {
+        stocks,
+        recipes,
+    };
+} else {
+    if (!globalThis.stocks && !globalThis.recipes) {
+        globalThis.stocks = stocks;
+        globalThis.recipes = recipes;
+    }
+}
diff --git a/graphs/js/foodTruck/dirtyFoodTruck.js b/graphs/js/foodTruck/dirtyFoodTruck.js
new file mode 100644
index 0000000..e0043e1
--- /dev/null
+++ b/graphs/js/foodTruck/dirtyFoodTruck.js
@@ -0,0 +1,172 @@
+if (typeof window === "undefined") {
+    if (!globalThis.stocks && !globalThis.recipes) {
+        const { stocks, recipes } = require("./data");
+
+        globalThis.stocks = stocks;
+        globalThis.recipes = recipes;
+    }
+}
+
+function delivering(recipeName) {
+    setTimeout(() => {
+        console.log(`Delivering ${recipeName}`);
+    }, 2000);
+}
+
+function end_of_order(recipeName) {
+    console.log("All ingredients have been prepared");
+    setTimeout(() => {
+        console.log(`Cooking ${recipeName}`);
+    }, 2000);
+    setTimeout(() => {
+        delivering(recipeName);
+    }, 5000);
+}
+
+function check_and_update_ingredient(recipeName, ingredient, quantity) {
+    if (globalThis.stocks[ingredient] < quantity) {
+        console.log(
+            `Not enough ingredients for ${recipeName} because there is no more ${ingredient}`,
+        );
+        return false;
+    }
+
+    globalThis.stocks[ingredient] -= quantity;
+    return true;
+}
+
+function check_and_update_ingredients(recipeName, ingredients) {
+    for (const ingredient in ingredients) {
+        const quantity = ingredients[ingredient];
+
+        if (!check_and_update_ingredient(recipeName, ingredient, quantity)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+function prepare_pizza(recipeName) {
+    let i = 0;
+    const pizza = globalThis.recipes.pizza[recipeName];
+    const timeouts = [];
+
+    timeouts.push(
+        setTimeout(() => {
+            console.log(`Preparing ${pizza.sauce}`);
+            if (!check_and_update_ingredient(recipeName, pizza.sauce, 1)) {
+                for (const t of timeouts) {
+                    clearTimeout(t);
+                }
+
+                return;
+            }
+        }, i),
+    );
+
+    timeouts.push(
+        setTimeout(() => {
+            i = 1000;
+            console.log(`Preparing ${Object.keys(pizza.toppings).join(", ")}`);
+            if (!check_and_update_ingredients(recipeName, pizza.toppings)) {
+                for (const t of timeouts) {
+                    clearTimeout(t);
+                }
+
+                return;
+            }
+
+            setTimeout(() => {
+                console.log(
+                    `Preparing ${Object.keys(pizza.cheese).join(", ")}`,
+                );
+                if (!check_and_update_ingredients(recipeName, pizza.cheese)) {
+                    for (const t of timeouts) {
+                        clearTimeout(t);
+                    }
+
+                    return;
+                }
+            }, i);
+        }, i + 1000),
+    );
+    i += 3000;
+    timeouts.push(
+        setTimeout(() => {
+            end_of_order(recipeName);
+        }, i),
+    );
+}
+
+function prepare_burger(recipeName) {
+    const burger = globalThis.recipes.burger[recipeName];
+    let i = 0;
+    const timeouts = [];
+
+    for (const ingredient in burger) {
+        const timeout = setTimeout(() => {
+            console.log(`Preparing ${ingredient}`);
+            if (
+                !check_and_update_ingredient(
+                    recipeName,
+                    ingredient,
+                    burger[ingredient],
+                )
+            ) {
+                for (const t of timeouts) {
+                    clearTimeout(t);
+                }
+
+                return;
+            }
+        }, i * 1000);
+
+        timeouts.push(timeout);
+        i++;
+    }
+
+    const lastTimeout = setTimeout(() => {
+        end_of_order(recipeName);
+    }, i * 1000);
+
+    timeouts.push(lastTimeout);
+}
+
+function order(recipeName) {
+    let i = 0;
+
+    console.log(`Ordering ${recipeName}`);
+
+    if (
+        !(recipeName in globalThis.recipes.pizza) &&
+        !(recipeName in globalThis.recipes.burger)
+    ) {
+        console.log(`Recipe ${recipeName} does not exist`);
+        return;
+    }
+
+    setTimeout(() => {
+        i = 1000;
+        setTimeout(() => {
+            console.log(`Production has started for ${recipeName}`);
+        }, i);
+    }, i + 1000);
+    i += 3000;
+    setTimeout(() => {
+        if (recipeName in globalThis.recipes.pizza) {
+            prepare_pizza(recipeName);
+        }
+    }, i);
+    setTimeout(() => {
+        if (recipeName in globalThis.recipes.burger) {
+            prepare_burger(recipeName);
+        }
+    }, i);
+}
+
+if (typeof window === "undefined") {
+    module.exports = {
+        order,
+    };
+}
diff --git a/graphs/js/foodTruck/foodTruck.js b/graphs/js/foodTruck/foodTruck.js
new file mode 100644
index 0000000..afe14d4
--- /dev/null
+++ b/graphs/js/foodTruck/foodTruck.js
@@ -0,0 +1,124 @@
+if (typeof window === "undefined") {
+    if (
+        !globalThis.stocks &&
+        !globalThis.recipes &&
+        !globalThis.globalThis.sleep
+    ) {
+        const { stocks, recipes } = require("./data");
+        const { sleep } = require("./sleep");
+
+        globalThis.stocks = stocks;
+        globalThis.recipes = recipes;
+        globalThis.globalThis.sleep = sleep;
+    }
+}
+
+if (typeof window === "undefined") {
+    module.exports = {
+        order,
+    };
+}
+
+/*
+ *
+ * Write your code below these lines
+ *
+ */
+async function end_of_order(recipeName, wait) {
+    if (wait) {
+        await globalThis.sleep(1);
+    }
+
+    console.log("All ingredients have been prepared");
+    await globalThis.sleep(2);
+    console.log(`Cooking ${recipeName}`);
+    await globalThis.sleep(5);
+    console.log(`Delivering ${recipeName}`);
+    return null;
+}
+function check_and_update_ingredient(recipeName, ingredient, quantity) {
+    if (globalThis.stocks[ingredient] < quantity) {
+        console.log(
+            `Not enough ingredients for ${recipeName} because there is no more ${ingredient}`,
+        );
+        return false;
+    }
+
+    globalThis.stocks[ingredient] -= quantity;
+    return true;
+}
+
+function check_and_update_ingredients(recipeName, ingredients) {
+    for (const ingredient in ingredients) {
+        const quantity = ingredients[ingredient];
+
+        if (!check_and_update_ingredient(recipeName, ingredient, quantity)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+async function order(recipeName) {
+    console.log(`Ordering ${recipeName}`);
+
+    if (
+        !(recipeName in globalThis.recipes.pizza) &&
+        !(recipeName in globalThis.recipes.burger)
+    ) {
+        console.log(`Recipe ${recipeName} does not exist`);
+        return;
+    }
+
+    await globalThis.sleep(2);
+    console.log(`Production has started for ${recipeName}`);
+    await globalThis.sleep(1);
+    if (recipeName in globalThis.recipes.burger) {
+        const burger = globalThis.recipes.burger[recipeName];
+
+        for (const ingredient in burger) {
+            console.log(`Preparing ${ingredient}`);
+            if (
+                !check_and_update_ingredient(
+                    recipeName,
+                    ingredient,
+                    burger[ingredient],
+                )
+            ) {
+                return;
+            }
+
+            await globalThis.sleep(1);
+        }
+
+        return await end_of_order(recipeName, false);
+    } else if (recipeName in globalThis.recipes.pizza) {
+        const pizza = globalThis.recipes.pizza[recipeName];
+
+        console.log(`Preparing ${pizza.sauce}`);
+        if (!check_and_update_ingredient(recipeName, pizza.sauce, 1)) {
+            return;
+        }
+
+        await globalThis.sleep(1);
+        console.log(`Preparing ${Object.keys(pizza.toppings).join(", ")}`);
+        if (!check_and_update_ingredients(recipeName, pizza.toppings)) {
+            return;
+        }
+
+        await globalThis.sleep(1);
+        console.log(`Preparing ${Object.keys(pizza.cheese).join(", ")}`);
+        if (!check_and_update_ingredients(recipeName, pizza.cheese)) {
+            return;
+        }
+
+        return await end_of_order(recipeName, true);
+    }
+}
+
+if (typeof window === "undefined") {
+    module.exports = {
+        order,
+    };
+}
diff --git a/graphs/js/foodTruck/index.html b/graphs/js/foodTruck/index.html
new file mode 100644
index 0000000..0bbc954
--- /dev/null
+++ b/graphs/js/foodTruck/index.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Foodtruck</title>
+    <link rel="stylesheet" href="static/style.css">
+
+
+</head>
+
+<body>
+    <header>
+        <h1 id="page-title">FoodTruck</h1>
+        <p>Choose your order !</p>
+        <button id="switch-button">
+            <a href="#">Switch to Dirty Foodtruck</a>
+        </button>
+    </header>
+
+
+    <div id="order">
+    </div>
+
+    <div id="display">
+    </div>
+
+    <footer>
+        <p>"Being a hero means fighting back even when it seems impossible."</p>
+    </footer>
+
+</body>
+<script src="static/failedOnload.js"></script>
+<script src="data.js" onerror="scriptFailedLoad(this.src)"></script>
+<script src="sleep.js" onerror="scriptFailedLoad(this.src)"></script>
+<script src="static/index.js"></script>
+<script src="foodTruck.js" onerror="scriptFailedLoad(this.src)"></script>
+
+</html>
\ No newline at end of file
diff --git a/graphs/js/foodTruck/sleep.js b/graphs/js/foodTruck/sleep.js
new file mode 100644
index 0000000..e4244d9
--- /dev/null
+++ b/graphs/js/foodTruck/sleep.js
@@ -0,0 +1,11 @@
+function sleep(s) {
+    return new Promise((resolve) => setTimeout(resolve, s * 1000));
+}
+
+if (typeof window === "undefined") {
+    module.exports = {
+        sleep,
+    };
+} else {
+    globalThis.sleep = sleep;
+}
diff --git a/graphs/js/foodTruck/static/failedOnload.js b/graphs/js/foodTruck/static/failedOnload.js
new file mode 100644
index 0000000..cf47073
--- /dev/null
+++ b/graphs/js/foodTruck/static/failedOnload.js
@@ -0,0 +1,9 @@
+function scriptFailedLoad(src) {
+    const container = document.getElementById("order");
+    const errorDiv = document.createElement("div");
+
+    errorDiv.id = "errorscript";
+    errorDiv.innerHTML = `
+    <p><b>Script '${src.split("/").pop()}' does not exist.</b></p>`;
+    container.appendChild(errorDiv);
+}
diff --git a/graphs/js/foodTruck/static/index.js b/graphs/js/foodTruck/static/index.js
new file mode 100644
index 0000000..6d84098
--- /dev/null
+++ b/graphs/js/foodTruck/static/index.js
@@ -0,0 +1,78 @@
+function addFood(name) {
+    const container = document.getElementById("order");
+    const foodDiv = document.createElement("div");
+
+    foodDiv.classList.add("food");
+    foodDiv.innerHTML = `
+    <p>${name}</p>
+    <button onclick=" order('${name}')">Order</button>`;
+    container.appendChild(foodDiv);
+}
+
+function logToDisplay(message, type = "info") {
+    const displayElement = document.getElementById("display");
+    const logMessage = document.createElement("div");
+
+    logMessage.textContent = message;
+    logMessage.classList.add("log-message", type);
+    displayElement.appendChild(logMessage);
+
+    displayElement.scrollTop = displayElement.scrollHeight;
+    setTimeout(() => {
+        logMessage.remove();
+    }, 5000);
+}
+
+console.log = logToDisplay;
+
+function loadMenu() {
+    if (document.getElementById("errorscript") === null) {
+        Object.keys(recipes).forEach((category) => {
+            Object.keys(recipes[category]).forEach((recipeName) => {
+                addFood(recipeName);
+            });
+        });
+    }
+}
+
+var isDirtyFoodtruck = false;
+var pageTitle = document.getElementById("page-title");
+var switchButton = document.getElementById("switch-button");
+
+function loadScript(isDirty) {
+    var scriptContainer = document.body;
+    var currentScripts = [...scriptContainer.querySelectorAll("script")].filter(
+        (script) => {
+            var name_script = script.src.split("/").pop();
+
+            return /(dirty)?foodtruck\.js/i.test(name_script);
+        },
+    );
+
+    // currentScripts should return only one value
+    scriptToLoad = isDirty ? "dirtyFoodTruck.js" : "foodTruck.js";
+    document.body.removeChild(currentScripts[0]);
+
+    const script = document.createElement("script");
+
+    script.src = scriptToLoad;
+
+    script.onerror = () => scriptFailedLoad(scriptToLoad);
+    script.onload = () => loadMenu();
+    document.body.appendChild(script);
+}
+
+switchButton.addEventListener("click", () => {
+    isDirtyFoodtruck = !isDirtyFoodtruck;
+    pageTitle.textContent = isDirtyFoodtruck ? "Dirty Foodtruck" : "Foodtruck";
+    switchButton.querySelector("a").textContent = isDirtyFoodtruck
+        ? "Switch to Foodtruck"
+        : "Switch to Dirty Foodtruck";
+    var orderDiv = document.getElementById("order");
+
+    orderDiv.innerHTML = "";
+
+    loadScript(isDirtyFoodtruck);
+});
+
+loadMenu();
diff --git a/graphs/js/foodTruck/static/style.css b/graphs/js/foodTruck/static/style.css
new file mode 100644
index 0000000..c094d98
--- /dev/null
+++ b/graphs/js/foodTruck/static/style.css
@@ -0,0 +1,200 @@
+:root {
+    --main-color: #21344a;
+    --background-color: #333;
+    --own-white: #FDF0E7;
+}
+
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+    font-family: Arial, sans-serif;
+
+}
+
+body {
+    background-color: var(--background-color);
+    color: #333;
+    font-size: 16px;
+    line-height: 1.5;
+    display: flex;
+    flex-direction: column;
+    min-height: 100vh;
+    margin: 0;
+}
+
+header {
+    background-color: var(--main-color);
+    color: var(--own-white);
+    text-align: center;
+    flex-shrink: 0;
+    padding: 20px 0;
+    position: relative;
+}
+
+header h1 {
+    font-size: 50px;
+    margin-bottom: 5px;
+}
+
+header p {
+    font-size: 20px;
+}
+
+header button {
+    position: absolute;
+    right: 20px;
+    top: 50%;
+    transform: translateY(-50%);
+    background-color: var(--own-white);
+    color: var(--main-color);
+    padding: 10px 15px;
+    font-size: 1rem;
+    font-weight: bold;
+    border-radius: 10px;
+    border-style: solid;
+    border-color: #000;
+    border-width: 1px;
+    cursor: pointer;
+    transition: background-color 0.3s, color 0.3s;
+    text-decoration: none;
+}
+
+header button:hover {
+    background-color: #f5f5f5;
+    color: var(--main-color);
+}
+
+header button a {
+    text-decoration: none;
+    color: inherit;
+}
+
+#order {
+    flex-shrink: 0;
+    margin: 0;
+
+    display: flex;
+    flex-wrap: wrap;
+    gap: 20px;
+    padding: 30px;
+    margin-top: 20px;
+    justify-content: space-between;
+}
+
+.food {
+    background-color: var(--own-white);
+    padding: 15px;
+    border-radius: 8px;
+    text-align: center;
+    flex: 1 1 calc(25% - 20px);
+    box-sizing: border-box;
+}
+
+.food p {
+    font-size: 20px;
+    margin-bottom: 10px;
+}
+
+.food button {
+    background-color: var(--main-color);
+    color: white;
+    border: none;
+    padding: 10px;
+    font-size: 16px;
+    border-radius: 5px;
+    cursor: pointer;
+    width: 100%;
+    transition: background-color 0.3s;
+}
+
+.food button:hover {
+    background-color: #972615;
+}
+
+#display {
+    flex-grow: 1;
+    overflow-y: auto;
+    background-color: var(--background-color);
+    color: white;
+    padding: 10px;
+    font-family: monospace;
+    white-space: pre-wrap;
+    box-sizing: border-box;
+    height: 0;
+    max-height: calc(100vh - 200px);
+    overflow-y: scroll;
+}
+
+.log-message {
+    padding: 5px;
+    border-radius: 5px;
+    animation: fadeOut 5s forwards;
+    overflow-y: hidden;
+    justify-content: center;
+    text-align: center;
+    align-items: center;
+}
+
+.log-message.info {
+    color: var(--own-white);
+    font-size: 20px;
+}
+
+.log-message.error {
+    color: #f44336;
+}
+
+.log-message.warn {
+    color: #ffc107;
+}
+
+@keyframes fadeOut {
+    0% {
+        opacity: 1;
+    }
+
+    80% {
+        opacity: 1;
+    }
+
+    100% {
+        opacity: 0;
+    }
+}
+
+#errorscript {
+    color: red;
+    font-size: 30px;
+    font-weight: bold;
+    text-align: center;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    width: 100%;
+    height: 100%;
+    background-color: rgba(255, 255, 255, 0.8);
+    box-sizing: border-box;
+    border-radius: 15px;
+    padding: 20px;
+}
+
+footer img {
+    size: 15px;
+}
+
+footer {
+    flex-shrink: 0;
+    background-color: var(--main-color);
+    color: white;
+    text-align: center;
+    padding: 20px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    gap: 20px;
+}
+
+footer p {
+    font-size: 20px;
+}
\ No newline at end of file
diff --git a/graphs/js/gallery/gallery.js b/graphs/js/gallery/gallery.js
new file mode 100644
index 0000000..8446846
--- /dev/null
+++ b/graphs/js/gallery/gallery.js
@@ -0,0 +1,54 @@
+const fs = require("fs");
+const path = require("path");
+
+function extract(directoryPath) {
+    const mail = new RegExp(
+        "([a-z0-9_.+-]+)@([a-z0-9.-]+)\\.(([a-zA-Z0-9]|\\.){2,})",
+        "g",
+    );
+
+    try {
+        let emails = [];
+        const dirs = fs.readdirSync(directoryPath, { withFileTypes: true });
+
+        for (const dir of dirs) {
+            if (dir.isFile()) {
+                const data = fs.readFileSync(
+                    path.join(directoryPath, dir.name),
+                    "utf8",
+                );
+                const matches = data.match(mail);
+
+                if (matches) {
+                    emails = [...emails, ...matches];
+                }
+            } else if (dir.isDirectory()) {
+                emails = [
+                    ...emails,
+                    ...extract(path.join(directoryPath, dir.name)),
+                ];
+            }
+        }
+
+        return emails;
+    } catch {
+        throw new Error("The directory does not exist");
+    }
+}
+
+/*
+
+fzhfeklzjfh@dakljhlzekj.f
+fkzjefh@aaa0.fr
+dejkzd@djkelh.fr
+djhezklf0587dzedez@gmail................
+xavier.login@epita.fr
+xavier.login@epita.fR
+
+*/
+
+module.exports = {
+    extract,
+};
+
+console.log(extract("gallery"));
diff --git a/graphs/js/helloWorld/helloWorld.js b/graphs/js/helloWorld/helloWorld.js
new file mode 100644
index 0000000..3564ffc
--- /dev/null
+++ b/graphs/js/helloWorld/helloWorld.js
@@ -0,0 +1,7 @@
+function helloWorld()
+{
+    console.log("Hello World!")
+}
+module.exports = {
+    helloWorld,
+};
\ No newline at end of file
diff --git a/graphs/js/inspectAndFuse/inspectAndFuse.js b/graphs/js/inspectAndFuse/inspectAndFuse.js
new file mode 100644
index 0000000..2072bb1
--- /dev/null
+++ b/graphs/js/inspectAndFuse/inspectAndFuse.js
@@ -0,0 +1,77 @@
+function getNumberFields(inputObject) {
+    if (inputObject == null) {
+        return new Array();
+    }
+
+    const res = new Array();
+
+    for (const prop in inputObject) {
+        if (typeof inputObject[prop] === "number") {
+            res.push(prop);
+        }
+    }
+
+    return res;
+}
+function incrementCounters(inputObject) {
+    const reg = /counter/i;
+    const fields = getNumberFields(inputObject);
+
+    if (fields == null) {
+        return;
+    }
+
+    fields.forEach((f) => {
+        if (f.match(reg)) {
+            inputObject[f]++;
+        }
+    });
+}
+function deleteUppercaseProperties(inputObject) {
+    if (inputObject == null) {
+        return;
+    }
+
+    const reg = /[a-z]/;
+
+    for (const prop in inputObject) {
+        if (!prop.match(reg)) {
+            delete inputObject[prop];
+        } else if (inputObject[prop] instanceof Object) {
+            deleteUppercaseProperties(inputObject[prop]);
+        }
+    }
+}
+function fusion(...objs) {
+    const res = {};
+
+    for (const obj of objs) {
+        for (const prop in obj) {
+            if (!Object.hasOwn(res, prop)) {
+                res[prop] = obj[prop];
+            } else {
+                if (
+                    typeof res[prop] != typeof obj[prop] ||
+                    typeof res[prop] === "boolean"
+                ) {
+                    res[prop] = obj[prop];
+                } else if (obj[prop] instanceof Array) {
+                    res[prop] = [...res[prop], ...obj[prop]];
+                } else if (typeof prop === "object") {
+                    res[prop] = fusion(res[prop], obj[prop]);
+                } else {
+                    res[prop] += obj[prop];
+                }
+            }
+        }
+    }
+
+    return res;
+}
+
+module.exports = {
+    fusion,
+    incrementCounters,
+    deleteUppercaseProperties,
+    getNumberFields,
+};
diff --git a/graphs/js/intergalactic/destinations.js b/graphs/js/intergalactic/destinations.js
new file mode 100644
index 0000000..c184458
--- /dev/null
+++ b/graphs/js/intergalactic/destinations.js
@@ -0,0 +1,47 @@
+function displayDestinations(destinations) {
+    if (
+        !(destinations instanceof Map) ||
+        destinations == null ||
+        destinations == undefined ||
+        destinations.size === 0
+    ) {
+        console.log("No destination is available.");
+    } else {
+        destinations.forEach((v, k) => {
+            console.log(k + ": " + v);
+        });
+    }
+}
+function addDestination(destinations, name, cost) {
+    if (
+        typeof name != "string" ||
+        typeof cost != "number" ||
+        cost < 0 ||
+        destinations.has(name)
+    ) {
+        return false;
+    }
+
+    destinations.set(name, cost);
+    return true;
+}
+function removeDestination(destinations, name) {
+    if (typeof name != "string" || !destinations.has(name)) {
+        return false;
+    } else {
+        destinations.delete(name);
+        return true;
+    }
+}
+function getDestinationsInOrder(destinations) {
+    const res = new Array();
+
+    destinations.forEach((v, k) => res.push([v, k]));
+    return res.sort((vkp1, vkp2) => vkp1[0] - vkp2[0]).map((vkp) => vkp[1]);
+}
+module.exports = {
+    displayDestinations,
+    addDestination,
+    removeDestination,
+    getDestinationsInOrder,
+};
diff --git a/graphs/js/intergalactic/travelers.js b/graphs/js/intergalactic/travelers.js
new file mode 100644
index 0000000..b806883
--- /dev/null
+++ b/graphs/js/intergalactic/travelers.js
@@ -0,0 +1,40 @@
+function addTraveler(travelers, firstname, lastname) {
+    const vip = /(.*[jJ].*[sS].*)|(.*[sS].*[jJ].*)/;
+    const fullname = firstname + " " + lastname;
+
+    if (travelers.length >= 8) {
+        console.log(fullname);
+        if (vip.test(fullname)) {
+            const last_i = travelers.findLastIndex(
+                (element) => !vip.test(element),
+            );
+
+            if (last_i === -1) {
+                return false;
+            }
+
+            travelers.splice(last_i, 1);
+        } else {
+            return false;
+        }
+    }
+
+    travelers.push(fullname);
+    return true;
+}
+function deleteTraveler(travelers, firstname, lastname) {
+    const fullname = firstname + " " + lastname;
+    const i = travelers.indexOf(fullname);
+
+    if (i === -1) {
+        return false;
+    }
+
+    travelers.splice(i, 1);
+    return true;
+}
+
+module.exports = {
+    addTraveler,
+    deleteTraveler,
+};
diff --git a/graphs/js/jestBasic/fibo.js b/graphs/js/jestBasic/fibo.js
new file mode 100644
index 0000000..0a19955
--- /dev/null
+++ b/graphs/js/jestBasic/fibo.js
@@ -0,0 +1,29 @@
+function fibo(n) {
+    if (typeof n != "number" || isNaN(n)) {
+        return -1;
+    }
+
+    if (n < 0) {
+        return -1;
+    }
+
+    if (n === 0) {
+        return 0;
+    }
+
+    let a = 1;
+    let b = 1;
+    let result = 1;
+
+    for (let i = 2; i < n; i++) {
+        result = a + b;
+        b = a;
+        a = result;
+    }
+
+    return result;
+}
+
+module.exports = {
+    fibo,
+};
diff --git a/graphs/js/jestBasic/fibo.test.js b/graphs/js/jestBasic/fibo.test.js
new file mode 100644
index 0000000..6a97365
--- /dev/null
+++ b/graphs/js/jestBasic/fibo.test.js
@@ -0,0 +1,37 @@
+const { fibo } = require("./fibo");
+
+describe("basic value", () => {
+    test("fibo of 0", () => {
+        expect(fibo(0)).toBe(0);
+    });
+    test("fibo of 1", () => {
+        expect(fibo(1)).toBe(1);
+    });
+    test("fibo of 2", () => {
+        expect(fibo(2)).toBe(1);
+    });
+    test("fibo of 4", () => {
+        expect(fibo(4)).toBe(3);
+    });
+    test("fibo of 19", () => {
+        expect(fibo(19)).toBe(4181);
+    });
+});
+
+describe("errors", () => {
+    test("fibo of -1", () => {
+        expect(fibo(-1)).toBe(-1);
+    });
+    test("fibo of null", () => {
+        expect(fibo(null)).toBe(-1);
+    });
+    test("fibo of undefined", () => {
+        expect(fibo(undefined)).toBe(-1);
+    });
+    test("fibo of a string", () => {
+        expect(fibo("uwu adrien")).toBe(-1);
+    });
+    test("fibo of NaN", () => {
+        expect(fibo(NaN)).toBe(-1);
+    });
+});
diff --git a/graphs/js/logMeIn/logMeIn.js b/graphs/js/logMeIn/logMeIn.js
new file mode 100644
index 0000000..2591071
--- /dev/null
+++ b/graphs/js/logMeIn/logMeIn.js
@@ -0,0 +1,59 @@
+const express = require("express");
+const jsonwebtoken = require("jsonwebtoken");
+
+function logMeIn(host, port) {
+    const secretKey = process.env.JWT_SECRET_KEY;
+    const app = express();
+
+    app.use(express.json());
+
+    app.get("/", (req, res) => {
+        res.status(200).send({ message: "Hello World!" });
+    });
+    app.post("/login", (req, res) => {
+        const login = req.body.username;
+        const passwd = req.body.password;
+
+        if (login !== "xavier.login" || passwd != "1234") {
+            res.status(401).send({ error: "Invalid username or password" });
+        } else {
+            const jwt = jsonwebtoken.sign(req.body, secretKey);
+
+            res.status(200).send({ jwt: jwt });
+        }
+    });
+    app.get("/secret", (req, res) => {
+        if (req.headers == null || req.headers == undefined) {
+            res.status(401).send({ error: "Unauthorized" });
+            return;
+        }
+
+        try {
+            const decoded = jsonwebtoken.verify(
+                req.headers.authorization.split(" ")[1],
+                secretKey,
+            );
+
+            if (
+                decoded.username !== "xavier.login" ||
+                decoded.password !== "1234"
+            ) {
+                res.status(401).send({ error: "Unauthorized" });
+            }
+
+            res.status(200).send({ message: "Access granted" });
+        } catch {
+            res.status(401).send({ error: "Unauthorized" });
+        }
+    });
+
+    return app.listen(port, () => {
+        console.log("Server running at http://" + host + ":" + port + "/");
+    });
+}
+
+module.exports = {
+    logMeIn,
+};
+
+//logMeIn("127.0.0.1", 3000);
diff --git a/graphs/js/modularLogger/modularLogger.js b/graphs/js/modularLogger/modularLogger.js
new file mode 100644
index 0000000..b22b23c
--- /dev/null
+++ b/graphs/js/modularLogger/modularLogger.js
@@ -0,0 +1,76 @@
+function makeLog(date, nameLogLevel, message) {
+    return (
+        "[" +
+        date.toLocaleString("fr-FR", { timeStyle: "medium" }) +
+        "][" +
+        nameLogLevel +
+        "] - " +
+        message
+    );
+}
+function loggerFactory() {
+    const logs = [];
+
+    return (level = 1000) => {
+        if (level === 1000) {
+            return (date, nameLogLevel, message) => {
+                if (
+                    !["DEBUG", "INFO", "WARN", "ERROR"].includes(nameLogLevel)
+                ) {
+                    console.log(
+                        nameLogLevel +
+                            " is an invalid log level. Please use one of the following: DEBUG, INFO, WARN, ERROR.",
+                    );
+                } else {
+                    logs.push({
+                        date: date,
+                        nameLogLevel: nameLogLevel,
+                        message: message,
+                    });
+                }
+            };
+        } else if (typeof level !== "number" || level < 0) {
+            console.log("Bad argument.");
+        } else {
+            if (level > 3) {
+                level = 3;
+            }
+
+            for (const log of logs) {
+                const print = makeLog(
+                    log["date"],
+                    log["nameLogLevel"],
+                    log["message"],
+                );
+
+                switch (log["nameLogLevel"]) {
+                    case "ERROR":
+                        console.log(print);
+                        break;
+                    case "WARN":
+                        if (level > 0) {
+                            console.log(print);
+                        }
+
+                        break;
+                    case "INFO":
+                        if (level > 1) {
+                            console.log(print);
+                        }
+
+                        break;
+                    case "DEBUG":
+                        if (level > 2) {
+                            console.log(print);
+                        }
+
+                        break;
+                }
+            }
+        }
+    };
+}
+
+module.exports = {
+    loggerFactory,
+};
diff --git a/graphs/js/myCompany/boss.js b/graphs/js/myCompany/boss.js
new file mode 100644
index 0000000..eadf09c
--- /dev/null
+++ b/graphs/js/myCompany/boss.js
@@ -0,0 +1,30 @@
+const { Employee } = require("./employee");
+
+class Boss extends Employee {
+    constructor(name, accreditationLevel) {
+        super(name);
+        this.accreditationLevel = accreditationLevel;
+    }
+    getAccreditation() {
+        return this.accreditationLevel;
+    }
+    fire(target) {
+        if (!(target instanceof Employee)) {
+            console.log("I cannot fire that!");
+            return false;
+        } else if (
+            !(target instanceof Boss) ||
+            target.getAccreditation() < this.accreditationLevel
+        ) {
+            console.log(target.getName() + " you are fired!");
+            return true;
+        } else {
+            console.log("I cannot fire someone superior to me!");
+            return false;
+        }
+    }
+}
+
+module.exports = {
+    Boss,
+};
diff --git a/graphs/js/myCompany/company.js b/graphs/js/myCompany/company.js
new file mode 100644
index 0000000..fd800e7
--- /dev/null
+++ b/graphs/js/myCompany/company.js
@@ -0,0 +1,77 @@
+const { Boss } = require("./boss");
+const { Employee } = require("./employee");
+
+class Company {
+    constructor(name) {
+        this.name = name;
+        this.employees = new Array();
+    }
+    getName() {
+        return this.name;
+    }
+    getEmployees() {
+        return this.employees;
+    }
+    getNumberOfEmployees() {
+        return this.employees.filter((e) => e instanceof Employee).length;
+    }
+    getNumberOfBosses() {
+        return this.employees.filter((e) => e instanceof Boss).length;
+    }
+    addEmployee(target) {
+        if (!(target instanceof Employee)) {
+            return;
+        }
+
+        this.employees.push(target);
+    }
+    promoteEmployee(targetIndex) {
+        if (this.employees[targetIndex] instanceof Boss) {
+            this.employees[targetIndex].accreditationLevel++;
+            console.log(
+                "Boss " +
+                    this.employees[targetIndex].getName() +
+                    " is promoted, his level of accreditation is now " +
+                    this.employees[targetIndex].getAccreditation(),
+            );
+        } else {
+            this.employees.splice(
+                targetIndex,
+                1,
+                new Boss(this.employees[targetIndex].getName(), 1),
+            );
+            console.log(
+                "Employee " +
+                    this.employees[targetIndex].getName() +
+                    " is promoted to boss post",
+            );
+        }
+    }
+    fireEmployee(bossIndex, targetIndex) {
+        if (this.employees[bossIndex].fire(this.employees[targetIndex])) {
+            if (this.employees[targetIndex] instanceof Boss) {
+                console.log(
+                    "Boss " +
+                        this.employees[targetIndex].getName() +
+                        " is no longer in " +
+                        this.name +
+                        " company",
+                );
+            } else {
+                console.log(
+                    "Employee " +
+                        this.employees[targetIndex].getName() +
+                        " is no longer in " +
+                        this.name +
+                        " company",
+                );
+            }
+
+            this.employees.splice(targetIndex, 1);
+        }
+    }
+}
+
+module.exports = {
+    Company,
+};
diff --git a/graphs/js/myCompany/employee.js b/graphs/js/myCompany/employee.js
new file mode 100644
index 0000000..5489dd7
--- /dev/null
+++ b/graphs/js/myCompany/employee.js
@@ -0,0 +1,21 @@
+class Employee {
+    constructor(name) {
+        this.name = name;
+    }
+    getName() {
+        return this.name;
+    }
+    fire(target) {
+        if (target instanceof Employee) {
+            console.log("I am an employee, I cannot fire someone!");
+        } else {
+            console.log("I cannot fire that!");
+        }
+
+        return false;
+    }
+}
+
+module.exports = {
+    Employee,
+};
diff --git a/graphs/js/notSoFast/articles.json b/graphs/js/notSoFast/articles.json
new file mode 100644
index 0000000..5ffb5fb
--- /dev/null
+++ b/graphs/js/notSoFast/articles.json
@@ -0,0 +1,74 @@
+[
+    {
+      "id":0,
+      "name": "Cheeseburger",
+      "description": "Beef patty, melted cheese, ketchup, mustard, pickles",
+      "price": 4.99,
+      "customer_note": 4.5,
+      "stocks": 20
+    },
+    {
+      "id":1,
+      "name": "Fries",
+      "description": "Crispy, golden-brown potato sticks",
+      "price": 2.49,
+      "customer_note": 4.0,
+      "stocks": 50
+    },
+    {
+      "id":2,
+      "name": "Hot Dog",
+      "description": "Grilled all-beef frankfurter, topped with ketchup, mustard, and relish",
+      "price": 3.99,
+      "customer_note": 3.5,
+      "stocks": 15
+    },
+    {
+      "id":3,
+      "name": "Chicken Nuggets",
+      "description": "Crispy breaded chicken bites, perfect for dipping",
+      "price": 5.99,
+      "customer_note": 4.2,
+      "stocks": 30
+    },
+    {
+      "id":4,
+      "name": "Milkshake",
+      "description": "Thick and creamy vanilla milkshake, made with real ice cream",
+      "price": 3.49,
+      "customer_note": 4.8,
+      "stocks": 10
+    },
+    {
+      "id":5,
+      "name": "BBQ Bacon Burger",
+      "description": "Beef patty, bacon, cheddar cheese, onion rings, BBQ sauce",
+      "price": 7.99,
+      "customer_note": 4.3,
+      "stocks": 5
+    },
+    {
+      "id":6,
+      "name": "Onion Rings",
+      "description": "Crispy fried onion rings, perfect as a side",
+      "price": 2.99,
+      "customer_note": 4.0,
+      "stocks": 40
+    },
+    {
+      "id":7,
+      "name": "Chicken Sandwich",
+      "description": "Grilled chicken breast, lettuce, tomato, mayo",
+      "price": 6.49,
+      "customer_note": 3.8,
+      "stocks": 25
+    },
+    {
+      "id":8,
+      "name": "Spicy Chicken Nuggets",
+      "description": "Crispy breaded chicken bites with a spicy kick",
+      "price": 6.99,
+      "customer_note": 4.5,
+      "stocks": 15
+    }
+]
\ No newline at end of file
diff --git a/graphs/js/notSoFast/notSoFast.js b/graphs/js/notSoFast/notSoFast.js
new file mode 100644
index 0000000..113c8f6
--- /dev/null
+++ b/graphs/js/notSoFast/notSoFast.js
@@ -0,0 +1,33 @@
+const axios = require("axios");
+
+async function notSoFast(host, port) {
+    let nbArticles = await axios.get(`http://${host}:${port}/articles`);
+
+    nbArticles = nbArticles.data.message;
+
+    const articles = [];
+
+    if (0 + nbArticles === 0) {
+        return articles;
+    }
+
+    let res = await axios.get(`http://${host}:${port}/articles/${0}`);
+
+    articles.push(res.data);
+    for (let i = 1; i < 0 + nbArticles; i++) {
+        const delay = res.headers["x-ratelimit-reset"] * 1000 - Date.now();
+
+        if (res.headers["x-ratelimit-remaining"] == 0) {
+            await new Promise((oof) => setTimeout(oof, delay + 26));
+        }
+
+        res = await axios.get(`http://${host}:${port}/articles/${i}`);
+        articles.push(res.data);
+    }
+
+    return articles;
+}
+
+module.exports = {
+    notSoFast,
+};
diff --git a/graphs/js/notSoFast/server.js b/graphs/js/notSoFast/server.js
new file mode 100644
index 0000000..916c7d8
--- /dev/null
+++ b/graphs/js/notSoFast/server.js
@@ -0,0 +1,147 @@
+const _0x56061b = _0x4a1f;
+
+(function (_0x3d4f7d, _0x384467) {
+    const _0x2bc30d = _0x4a1f,
+        _0x2a57c0 = _0x3d4f7d();
+
+    while ([]) {
+        try {
+            const _0x509389 =
+                parseInt(_0x2bc30d(0xf9)) / 0x1 +
+                (-parseInt(_0x2bc30d(0xf8)) / 0x2) *
+                    (parseInt(_0x2bc30d(0xf3)) / 0x3) +
+                parseInt(_0x2bc30d(0x100)) / 0x4 +
+                -parseInt(_0x2bc30d(0xef)) / 0x5 +
+                parseInt(_0x2bc30d(0xeb)) / 0x6 +
+                parseInt(_0x2bc30d(0xee)) / 0x7 +
+                (-parseInt(_0x2bc30d(0xe3)) / 0x8) *
+                    (-parseInt(_0x2bc30d(0xf4)) / 0x9);
+
+            if (_0x509389 === _0x384467) {
+                break;
+            } else {
+                _0x2a57c0["push"](_0x2a57c0["shift"]());
+            }
+        } catch (_0x4f4837) {
+            _0x2a57c0["push"](_0x2a57c0["shift"]());
+        }
+    }
+})(_0x5ba1, 0x37cc5);
+const express = require(_0x56061b(0xfa)),
+    app = express(),
+    path = require("path");
+const articles_data = require(
+        path[_0x56061b(0xfd)](__dirname, _0x56061b(0xf7)),
+    ),
+    rateLimiter = {
+        max: 0x5,
+        windowMs: 0x3e8,
+        reset: Date[_0x56061b(0xe7)]() - 0x7d0,
+        remaining: 0x5,
+    };
+
+function _0x4a1f(_0xa5c9f4, _0x34d88a) {
+    const _0x5ba126 = _0x5ba1();
+
+    return (
+        (_0x4a1f = function (_0x4a1f4f, _0x57de0b) {
+            _0x4a1f4f = _0x4a1f4f - 0xe1;
+            const _0x91c04c = _0x5ba126[_0x4a1f4f];
+
+            return _0x91c04c;
+        }),
+        _0x4a1f(_0xa5c9f4, _0x34d88a)
+    );
+}
+function _0x5ba1() {
+    const _0x15e55c = [
+        "remaining",
+        "/articles",
+        "X-RateLimit-Reset",
+        "now",
+        "X-RateLimit-Remaining",
+        "\x20has\x20been\x20found",
+        "end",
+        "1185066KdUuVR",
+        "listen",
+        "send",
+        "1849449xJgCmq",
+        "1269280gTNiiN",
+        "get",
+        "reset",
+        "/articles/:id([0-9]+)",
+        "111uXMghV",
+        "72891SGOhSD",
+        "Too\x20many\x20requests",
+        "Server\x20running\x20at\x20http://localhost:",
+        "./articles.json",
+        "11996YaeIzr",
+        "64830rqNiDl",
+        "express",
+        "status",
+        "find",
+        "resolve",
+        "No\x20article\x20with\x20id\x20",
+        "max",
+        "678736fMeEWy",
+        "X-RateLimit-Limit",
+        "params",
+        "log",
+        "set",
+        "8YaqgyJ",
+    ];
+
+    _0x5ba1 = function () {
+        return _0x15e55c;
+    };
+    return _0x5ba1();
+}
+app[_0x56061b(0xf0)](_0x56061b(0xe5), (_0x53adb0, _0x2f6c36) => {
+    const _0x2e7227 = _0x56061b;
+
+    _0x2f6c36[_0x2e7227(0xfb)](0xc8)[_0x2e7227(0xed)]({
+        message: articles_data["length"],
+    });
+}),
+    app["get"](_0x56061b(0xf2), (_0x58952c, _0x1c1b41) => {
+        const _0x1800af = _0x56061b;
+
+        rateLimiter[_0x1800af(0xf1)] < Date[_0x1800af(0xe7)]() &&
+            ((rateLimiter["remaining"] = rateLimiter["max"]),
+            (rateLimiter["reset"] = Date["now"]() + rateLimiter["windowMs"]));
+        if (rateLimiter[_0x1800af(0xe4)] == 0x0) {
+            _0x1c1b41[_0x1800af(0xfb)](0x1ad)["send"](_0x1800af(0xf5));
+            return;
+        } else {
+            rateLimiter[_0x1800af(0xe4)]--;
+        }
+
+        const _0xca1069 = rateLimiter[_0x1800af(0xff)],
+            _0x5c15a1 = rateLimiter[_0x1800af(0xe4)],
+            _0x5d6b61 = parseFloat(rateLimiter[_0x1800af(0xf1)] / 0x3e8);
+
+        _0x1c1b41[_0x1800af(0xe2)](_0x1800af(0x101), _0xca1069),
+            _0x1c1b41[_0x1800af(0xe2)](_0x1800af(0xe8), _0x5c15a1),
+            _0x1c1b41[_0x1800af(0xe2)](_0x1800af(0xe6), _0x5d6b61);
+        const _0x413373 = articles_data[_0x1800af(0xfc)](
+            (_0x4868bf) =>
+                _0x4868bf["id"] === parseInt(_0x58952c[_0x1800af(0x102)]["id"]),
+        );
+
+        if (_0x413373) {
+            _0x1c1b41["status"](0xc8)["send"](_0x413373);
+            return;
+        } else {
+            _0x1c1b41["writeHead"](
+                0x194,
+                _0x1800af(0xfe) +
+                    _0x58952c[_0x1800af(0x102)]["id"] +
+                    _0x1800af(0xe9),
+            );
+        }
+
+        _0x1c1b41[_0x1800af(0xea)]();
+    });
+const server = app[_0x56061b(0xec)](0xbb8, () => {});
+
+console[_0x56061b(0xe1)](_0x56061b(0xf6) + 0xbb8 + "/");
diff --git a/graphs/js/oidc/complete/epita/index.html b/graphs/js/oidc/complete/epita/index.html
new file mode 100644
index 0000000..2706a33
--- /dev/null
+++ b/graphs/js/oidc/complete/epita/index.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<script defer src="./index.js" type="module"></script>
+		<link rel="stylesheet" href="../../style.css">
+	</head>
+	<body>
+		<div class="card-container">
+			<div class="img-container">
+				<img class="round" id="image"src="https://cri.epita.fr/photos/square/puff" alt="user" width="225" height="225"/>
+			</div>
+			<h1 id="name">Puff Puff</h1>
+			<h3 id="campus">Marseille</h3>
+			<p id ="grad-year">2059</p>
+			
+			<div class="info-container">
+				<div class="infos">
+					<h3>infos</h3>
+					<ul id="list">
+					</ul>
+				</div>
+			</div>
+			<div class="buttons">
+				<button class="primary" id="RequestBtn">
+					Request Infos
+				</button>
+				<button class="primary ghost" id="EndBtn">
+					End Session
+				</button>
+			</div>
+		</div>
+    </body>
+</html>
diff --git a/graphs/js/oidc/complete/epita/index.js b/graphs/js/oidc/complete/epita/index.js
new file mode 100644
index 0000000..513197c
--- /dev/null
+++ b/graphs/js/oidc/complete/epita/index.js
@@ -0,0 +1,40 @@
+window.END_SESSION_URL = "https://cri.epita.fr/end-session";
+const reqInfosBtn = document.getElementById("RequestBtn");
+const params = new URLSearchParams(window.location.search);
+const code = params.get("code");
+
+let form = new FormData();
+
+form.append("client_id", "assistants-atelier-js");
+form.append("redirect_uri", "http://localhost:8080/complete/epita/");
+form.append("grant_type", "authorization_code");
+form.append("code", code);
+const tokenEndpoint = "http://localhost:8080/auth-api";
+reqInfosBtn.addEventListener("click", async () => {
+    let response = await fetch(tokenEndpoint, {
+        method: "POST",
+        body: form,
+    });
+    const responsePretty = await response.json();
+    const token = responsePretty.id_token;
+    const content = token.split(".")[1];
+    const b64 = content.replace(/-/g, "+").replace(/_/g, "/");
+    const payload = JSON.parse(window.atob(b64));
+
+    document.getElementById("name").innerHTML = payload.name;
+    document.getElementById("campus").innerHTML = payload.zoneinfo;
+    document.getElementById("grad-year").innerHTML = payload.graduation_years;
+    document
+        .getElementById("image")
+        .setAttribute("src", payload.picture_square);
+    const ul = document.getElementById("list");
+    for (const group of payload.groups) {
+        const item = document.createElement("li");
+        item.innerHTML = group.slug + " " + group.name;
+        ul.appendChild(item);
+    }
+});
+
+document
+    .getElementById("EndBtn")
+    .addEventListener("click", () => window.location.replace(END_SESSION_URL));
diff --git a/graphs/js/oidc/main.html b/graphs/js/oidc/main.html
new file mode 100644
index 0000000..698eb6d
--- /dev/null
+++ b/graphs/js/oidc/main.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <link rel="stylesheet" href="./style.css">
+        <script defer src="./redirect.js"></script>
+	</head>
+	<body>
+        
+		<div class="card-container">
+			<div class="img-container">
+				<img class="round" src="https://cri.epita.fr/photos/square/puff" alt="user" width="225" height="225"/>
+			</div>
+			<h1>User Application</h1>
+			<h3>app</h3>
+			<p>Small application to display user informations<br/> Using ForgeID for Auth</p>
+
+            <div class="buttons">
+				<button class="primary" id="redirectBtn">
+					Sign-In
+				</button>
+			</div>
+		</div>
+    </body>
+</html>
+
diff --git a/graphs/js/oidc/redirect.js b/graphs/js/oidc/redirect.js
new file mode 100644
index 0000000..d063df3
--- /dev/null
+++ b/graphs/js/oidc/redirect.js
@@ -0,0 +1,17 @@
+const redirectBtn = document.getElementById("redirectBtn");
+
+const authQueryParams = {
+    client_id: "assistants-atelier-js",
+    scope: "epita profile picture",
+    redirect_uri: "http://localhost:8080/complete/epita/",
+    response_type: "code",
+};
+
+const authEndpoint = "https://cri.epita.fr/authorize";
+window.LOGIN_URL = new URL(
+    `?client_id=${authQueryParams.client_id}&scope=${authQueryParams.scope}&redirect_uri=${authQueryParams.redirect_uri}&response_type=${authQueryParams.response_type}`,
+    authEndpoint,
+);
+redirectBtn.addEventListener("click", () => {
+    window.location.replace(window.LOGIN_URL);
+});
diff --git a/graphs/js/oidc/server.js b/graphs/js/oidc/server.js
new file mode 100644
index 0000000..401b48f
--- /dev/null
+++ b/graphs/js/oidc/server.js
@@ -0,0 +1,33 @@
+const express = require("express");
+const { createProxyMiddleware } = require("http-proxy-middleware");
+
+const app = express();
+
+/**
+ * The requests sent to our local server running on http://localhost:8080
+ * will pass by the reverse proxy and be sent to a specified path.
+ *
+ * In our case,
+ * /auth-api -> https://cri.epita.fr/token
+ **/
+
+const path = `https://cri.epita.fr/token`;
+const proxyAuth = createProxyMiddleware("/auth-api", {
+    target: path,
+    changeOrigin: true,
+    pathRewrite: {
+        "^/auth-api": "",
+    },
+});
+
+app.get("/", (req, res) => {
+    res.sendFile("main.html", { root: "./" });
+});
+
+app.use(proxyAuth, express.static("./"));
+
+const port = 8080;
+
+app.listen(port, () => {
+    console.log(`Server is running at http://localhost:${port}`);
+});
diff --git a/graphs/js/oidc/style.css b/graphs/js/oidc/style.css
new file mode 100644
index 0000000..0433246
--- /dev/null
+++ b/graphs/js/oidc/style.css
@@ -0,0 +1,116 @@
+@import url('https://fonts.googleapis.com/css?family=Montserrat');
+
+* {
+	box-sizing: border-box;
+}
+
+body {
+	background-color: whitesmoke;
+	font-family: Montserrat, sans-serif;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	min-height: 100vh;
+}
+
+h1 {
+	margin: 10px 0;
+    color: white;
+	word-break: break-all;
+}
+
+h3 {
+	margin: 5px 0;
+	text-transform: uppercase;
+    color: white;
+	word-break: break-all;
+}
+
+p {
+	font-size: 16px;
+	line-height: 21px;
+    color: white;
+	word-break: break-all;
+}
+
+.card-container {
+    background: linear-gradient(180deg, rgba(8,4,78,1) 0%, rgba(9,9,121,1) 51%, rgba(0,155,255,1) 100%);
+	box-shadow: 0px 20px 40px -10px rgba(0,0,0,0.75);
+	padding-top: 30px;	
+	width: 600px;
+	height: auto;
+	max-width: 100%;
+	text-align: center;
+	display: flex;
+	flex-direction: column;
+	justify-content: center;
+	border-radius: 25px;
+}
+
+.img-container {
+	display: flex;
+	width: 100%;
+	align-items: center;
+	justify-content: center;
+	margin-bottom: 6em;
+}
+
+.round {
+	border: 3px solid whitesmoke;
+	border-radius: 50%;
+	padding: 2px;
+}
+
+.buttons {
+	margin-top: 2em;
+}
+
+button {
+    margin-bottom: 10px;
+}
+
+button.primary {
+	background-color: whitesmoke;
+	border: 1px solid black;
+	border-radius: 3px;
+	color: #231E39;
+	font-family: Montserrat, sans-serif;
+	font-weight: 500;
+	padding: 10px 25px;
+}
+
+button.primary.ghost {
+	background-color: transparent;
+	color: black;
+}
+
+.info-container {
+    display: flex;
+    justify-content: center;
+}
+
+.infos {
+	background-color: #0a0a8a;
+    border-radius: 10px;
+	text-align: left;
+	padding: 15px;
+	margin-top: 30px;
+    width: 80%;
+    margin-bottom: 15px;
+}
+
+.infos ul {
+	list-style-type: none;
+	margin: 0;
+	padding: 0;
+}
+
+.infos ul li {
+	border: 2px solid whitesmoke;
+	border-radius: 5px;
+    color: white;
+	display: inline-block;
+	font-size: 14px;
+	margin: 0 7px 7px 0;
+	padding: 7px;
+}
\ No newline at end of file
diff --git a/graphs/js/replace/replace.js b/graphs/js/replace/replace.js
new file mode 100644
index 0000000..24b79e4
--- /dev/null
+++ b/graphs/js/replace/replace.js
@@ -0,0 +1,8 @@
+function replace(str) {
+    const captureDateRegex = new RegExp("(\\d{2})/(\\d{2})/(\\d{4})", "g");
+
+    return str.replaceAll(captureDateRegex, "$3-$1-$2");
+}
+module.exports = {
+    replace,
+};
diff --git a/graphs/js/storageWars/index.html b/graphs/js/storageWars/index.html
new file mode 100644
index 0000000..49fad63
--- /dev/null
+++ b/graphs/js/storageWars/index.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <script defer src="storageWars.js"></script>
+    <title>Storage Wars</title>
+</head>
+<body style="max-width: fit-content; margin-left: auto; margin-right: auto;">
+    <div>
+        <input type="text" id="inputJWT">
+        <button id="addToken" onclick="addToken()">Add JWT</button>
+    </div>
+    <div id="userInfo" style="display: none;">
+        <h1>User Info</h1>
+        <p>Name: <span id="name"></span></p>
+        <p>Email: <span id="email"></span></p>
+        <p>Age: <span id="age"></span></p>
+    </div>
+    <div id="error"></div>
+</body>
+</html>
diff --git a/graphs/js/storageWars/storageWars.js b/graphs/js/storageWars/storageWars.js
new file mode 100644
index 0000000..ed90536
--- /dev/null
+++ b/graphs/js/storageWars/storageWars.js
@@ -0,0 +1,80 @@
+/* FIXME */
+const userInfo = document.getElementById("userInfo");
+const userName = document.getElementById("name");
+const userEmail = document.getElementById("email");
+const userAge = document.getElementById("age");
+const errorBox = document.getElementById("error");
+const jwtField = document.getElementById("inputJWT");
+
+localStorage.clear();
+
+function displayError() {
+    errorBox.innerHTML = "Invalid token";
+    if (localStorage.getItem("token")) {
+        localStorage.removeItem("token");
+    }
+
+    userInfo.style.display = "none";
+}
+
+function decodeToken() {
+    if (localStorage.getItem("token") != null) {
+        // parse the token
+        try {
+            const token = localStorage.getItem("token");
+            const content = token.split(".")[1];
+            const b64 = content.replace(/-/g, "+").replace(/_/g, "/");
+            const payload = decodeURIComponent(window.atob(b64));
+
+            return JSON.parse(payload);
+        } catch {
+            displayError();
+        }
+    } else {
+        return null;
+    }
+}
+
+function addToken() {
+    /* FIXME */
+    localStorage.setItem("token", jwtField.value);
+    display();
+}
+
+function display() {
+    errorBox.innerHTML = "";
+    if (localStorage.getItem("token") === "") {
+        displayError();
+        return;
+    }
+
+    // validity check
+    const dec = decodeToken();
+
+    if (dec == null || Date.now() < dec.iat * 1000) {
+        displayError();
+        return;
+    }
+
+    userInfo.style.display = "inherit";
+    if (dec["name"] != undefined) {
+        userName.innerHTML = dec["name"];
+    } else {
+        userName.innerHTML = "No name";
+    }
+
+    if (dec["email"] != undefined) {
+        userEmail.innerHTML = dec["email"];
+    } else {
+        userEmail.innerHTML = "No email";
+    }
+
+    if (dec["age"] != undefined) {
+        userAge.innerHTML = dec["age"];
+    } else {
+        userAge.innerHTML = "No age";
+    }
+}
+
+window.addToken = addToken;
+display();
diff --git a/graphs/js/throttleDebounce/throttleDebounce.js b/graphs/js/throttleDebounce/throttleDebounce.js
new file mode 100644
index 0000000..f6e15f9
--- /dev/null
+++ b/graphs/js/throttleDebounce/throttleDebounce.js
@@ -0,0 +1,48 @@
+function debounce(func, n) {
+    let timer = null;
+
+    return (...args) => {
+        clearTimeout(timer);
+        timer = setTimeout(func, n, ...args);
+    };
+}
+function throttle(func, n) {
+    let throttling = false;
+    let last_args = null;
+    let last_call = Date.now();
+    let timeout = null;
+
+    return (...args) => {
+        if (!throttling) {
+            last_call = Date.now();
+            if (last_args) {
+                func.apply(this, last_args);
+                last_args = null;
+            } else {
+                func(...args);
+            }
+
+            throttling = true;
+            if (timeout) {
+                clearTimeout(timeout);
+            }
+
+            timeout = setTimeout(
+                () => {
+                    throttling = false;
+
+                    if (last_args) {
+                        func.apply(this, last_args);
+                    }
+                },
+                n - (Date.now() - last_call),
+            );
+        } else {
+            last_args = args;
+        }
+    };
+}
+module.exports = {
+    debounce,
+    throttle,
+};
diff --git a/graphs/js/todoList/index.html b/graphs/js/todoList/index.html
new file mode 100644
index 0000000..116cd2c
--- /dev/null
+++ b/graphs/js/todoList/index.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="en" >
+	<head>
+		<meta charset="utf-8">
+		<title>My To-do List</title>
+		<script src="todoList.js" defer></script>
+		<link rel="stylesheet" href="style.css">
+	</head>
+	<body>
+		<h1>My To-do List</h1>
+		<div>
+			<input id="textBox" type="text" placeholder="Enter a task...">
+			<button id="addButton">Add Item</button>
+		</div>
+		<ul id="todoList"></ul>
+	</body>
+</html>
diff --git a/graphs/js/todoList/style.css b/graphs/js/todoList/style.css
new file mode 100644
index 0000000..ebdd8d7
--- /dev/null
+++ b/graphs/js/todoList/style.css
@@ -0,0 +1,64 @@
+body {
+    background-color: #f2f2f2;
+    font-family: Arial, sans-serif;
+}
+
+h1 {
+    text-align: center;
+    margin-top: 20px;
+}
+
+div {
+    display: flex;
+    justify-content: center;
+    width: 70%;
+    margin-right: auto;
+    margin-left: auto;
+}
+
+input[type="text"] {
+    padding: 10px;
+    border: none;
+    border-radius: 5px;
+    margin-right: 10px;
+    width: 70%;
+}
+
+#todoList {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    margin-top: 30px;
+    list-style-type: decimal;
+}
+
+.todoItem {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 10px;
+    margin-bottom: 10px;
+    width: 80%;
+    background-color: #fff;
+    border-radius: 5px;
+    box-shadow: 0 2px 2px rgba(0, 0, 0, 0.3);
+}
+
+.todoText {
+    flex-grow: 1;
+    margin-right: 10px;
+    padding-left: 10px;
+}
+
+button {
+    padding: 5px 10px;
+    background-color: #f44336;
+    color: white;
+    border: none;
+    border-radius: 5px;
+    cursor: pointer;
+}
+
+button:hover {
+    background-color: #e53935;
+}
diff --git a/graphs/js/todoList/todoList.js b/graphs/js/todoList/todoList.js
new file mode 100644
index 0000000..34b2edf
--- /dev/null
+++ b/graphs/js/todoList/todoList.js
@@ -0,0 +1,27 @@
+const input = document.getElementById("textBox");
+const addBtn = document.getElementById("addButton");
+const list = document.getElementById("todoList");
+
+addBtn.addEventListener("click", () => {
+    if (input.value === "") {
+        return;
+    }
+
+    const todo = document.createElement("li");
+
+    todo.classList.add("todoItem");
+    const label = document.createElement("span");
+
+    label.innerHTML = input.value;
+    input.value = "";
+    label.classList.add("todoText");
+    todo.appendChild(label);
+    const del = document.createElement("button");
+
+    del.innerHTML = "Delete";
+    del.addEventListener("click", () => {
+        list.removeChild(todo);
+    });
+    todo.appendChild(del);
+    list.appendChild(todo);
+});
diff --git a/graphs/piscine/80cols/80cols.sh b/graphs/piscine/80cols/80cols.sh
new file mode 100755
index 0000000..d66cf9b
--- /dev/null
+++ b/graphs/piscine/80cols/80cols.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+[ $# -ne 1 ] && exit 1
+[ -f $1 ] || exit 1
+
+while IFS='' read -r line; do
+    var=$(printf '%s' "$line" | wc -m)
+    [ "$var" -ge 80 ] && printf '%s\n' "$line"
+done < "$1"
+
+exit 0
diff --git a/graphs/piscine/80cols_grep/80cols.grep b/graphs/piscine/80cols_grep/80cols.grep
new file mode 100644
index 0000000..1fe0c1f
--- /dev/null
+++ b/graphs/piscine/80cols_grep/80cols.grep
@@ -0,0 +1 @@
+.\{80,\}
diff --git a/graphs/piscine/a.out b/graphs/piscine/a.out
new file mode 100755
index 0000000..33e84ed
--- /dev/null
+++ b/graphs/piscine/a.out
diff --git a/graphs/piscine/add_int_ptr/add_int_ptr.c b/graphs/piscine/add_int_ptr/add_int_ptr.c
new file mode 100644
index 0000000..ad48639
--- /dev/null
+++ b/graphs/piscine/add_int_ptr/add_int_ptr.c
@@ -0,0 +1,7 @@
+int *add_int_ptr(int *a, int *b)
+{
+    if (!a || !b)
+        return a;
+    *a += *b;
+    return a;
+}
diff --git a/graphs/piscine/alphabet/alphabet.c b/graphs/piscine/alphabet/alphabet.c
new file mode 100644
index 0000000..9496c66
--- /dev/null
+++ b/graphs/piscine/alphabet/alphabet.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main(void)
+{
+    for (char i = 'a'; i < 'z'; i++)
+    {
+        putchar(i);
+        putchar(' ');
+    }
+    putchar('z');
+    putchar('\n');
+    return 0;
+}
diff --git a/graphs/piscine/alphanum/alphanum.sh b/graphs/piscine/alphanum/alphanum.sh
new file mode 100755
index 0000000..e4c5aee
--- /dev/null
+++ b/graphs/piscine/alphanum/alphanum.sh
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+letters()
+{
+    grepped=$(echo "$1" | grep -E "^[a-zA-Z]+$")
+    [ "$1" = "$grepped" ] && return 0 || return 1
+}
+
+empty()
+{
+    if echo "$1" | grep -qE '^[[:space:]]+$'; then
+        return 0
+    fi
+    return 1
+}
+
+digit()
+{
+    grepped=$(echo "$1" | grep -E "^[0-9]$")
+    [ "$1" = "$grepped" ] && return 0 || return 1
+}
+
+number()
+{
+    grepped=$(echo "$1" | grep -E "^[1-9][0-9]+$")
+    [ "$1" = "$grepped" ] && return 0 || return 1
+}
+
+alph()
+{
+    grepped=$(echo "$1" | grep -E "^[a-zA-Z0-9]+$")
+    [ "$1" = "$grepped" ] && return 0 || return 1
+}
+
+while IFS='' read -r str; do
+    if [ -z "$str" ]; then
+        echo it is empty
+        continue
+    elif letters "$str"; then
+        echo "it is a word"
+    elif number "$str"; then
+        echo "it is a number"
+    elif digit "$str"; then
+        echo "it is a digit"
+    elif empty "$str"; then
+        echo "it is empty"
+    elif alph "$str"; then
+        echo "it is an alphanum"
+    else
+        echo "it is too complicated"
+        exit
+    fi
+done
diff --git a/graphs/piscine/array_max_min/array_max_min.c b/graphs/piscine/array_max_min/array_max_min.c
new file mode 100644
index 0000000..8b2d3a5
--- /dev/null
+++ b/graphs/piscine/array_max_min/array_max_min.c
@@ -0,0 +1,23 @@
+#include <stddef.h>
+#include <stdio.h>
+
+void array_max_min(int tab[], size_t len, int *max, int *min)
+{
+    if (tab && len)
+    {
+        *min = tab[0];
+        *max = tab[0];
+
+        for (size_t i = 0; i < len; i++)
+        {
+            if (tab[i] > *max)
+            {
+                *max = tab[i];
+            }
+            else if (tab[i] < *min)
+            {
+                *min = tab[i];
+            }
+        }
+    }
+}
diff --git a/graphs/piscine/ascii_carousel/rot_x.c b/graphs/piscine/ascii_carousel/rot_x.c
new file mode 100644
index 0000000..667106d
--- /dev/null
+++ b/graphs/piscine/ascii_carousel/rot_x.c
@@ -0,0 +1,26 @@
+#include <stddef.h>
+
+void rot_x(char *s, int x)
+{
+    if (s == NULL)
+    {
+        return;
+    }
+
+    if (x < 0)
+    {
+        x = 26 + x;
+    }
+
+    for (size_t i = 0; s[i]; i++)
+    {
+        if (s[i] >= 'a' && s[i] <= 'z')
+        {
+            s[i] = ((s[i] - 'a') + x) % 26 + 'a';
+        }
+        else if (s[i] >= 'A' && s[i] <= 'Z')
+        {
+            s[i] = ((s[i] - 'A') + x) % 26 + 'A';
+        }
+    }
+}
diff --git a/graphs/piscine/ascii_house/ascii_house.sh b/graphs/piscine/ascii_house/ascii_house.sh
new file mode 100755
index 0000000..83d907e
--- /dev/null
+++ b/graphs/piscine/ascii_house/ascii_house.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+
+echo '  /\'
+echo ' /  \'
+echo -n "/____\\  \`" && echo "'\`"
+echo -n "|    | \`" && echo "'''\`"
+echo "|    |  \`|\`"
+echo '|_/\_|___|__'
diff --git a/graphs/piscine/assignment_operator/assignment_operator.c b/graphs/piscine/assignment_operator/assignment_operator.c
new file mode 100644
index 0000000..cae560f
--- /dev/null
+++ b/graphs/piscine/assignment_operator/assignment_operator.c
@@ -0,0 +1,37 @@
+void plus_equal(int *a, int *b)
+{
+    if (!a || !b)
+    {
+        return;
+    }
+    *a = *a + *b;
+}
+
+void minus_equal(int *a, int *b)
+{
+    if (!a || !b)
+    {
+        return;
+    }
+    *a = *a - *b;
+}
+
+void mult_equal(int *a, int *b)
+{
+    if (!a || !b)
+    {
+        return;
+    }
+    *a = *a * *b;
+}
+
+int div_equal(int *a, int *b)
+{
+    if (!a || !b || *b == 0)
+    {
+        return 0;
+    }
+    int res = *a % *b;
+    *a = *a / *b;
+    return res;
+}
diff --git a/graphs/piscine/binary_search_ptr/bsearch.c b/graphs/piscine/binary_search_ptr/bsearch.c
new file mode 100644
index 0000000..bdc189c
--- /dev/null
+++ b/graphs/piscine/binary_search_ptr/bsearch.c
@@ -0,0 +1,38 @@
+#include "bsearch.h"
+
+#include <stddef.h>
+
+int *binary_search(int *begin, int *end, int elt)
+{
+    if (begin == end)
+    {
+        return begin;
+    }
+    if (begin > end)
+    {
+        if (elt > *begin)
+        {
+            return begin + 1;
+        }
+        return begin;
+    }
+
+    size_t m = (end - begin) / 2;
+
+    if (begin[m] == elt)
+    {
+        return begin + m;
+    }
+
+    if (begin[m] > elt)
+    {
+        return binary_search(begin, begin + m, elt);
+    }
+
+    if (m == 0)
+    {
+        m++;
+    }
+
+    return binary_search(begin + m, end, elt);
+}
diff --git a/graphs/piscine/binary_search_ptr/bsearch.h b/graphs/piscine/binary_search_ptr/bsearch.h
new file mode 100644
index 0000000..e011744
--- /dev/null
+++ b/graphs/piscine/binary_search_ptr/bsearch.h
@@ -0,0 +1,16 @@
+#ifndef BSEARCH_H_
+#define BSEARCH_H_
+
+/*
+** Search `elt` in the memory range of [`begin` - `end`[.
+** `begin` is a pointer to the first element.
+** `end` is a pointer **AFTER** the last element.
+** The elements in the range [`begin` - `end`[ are sorted in ascending order.
+** If the range is empty, `begin` == `end`.
+** `begin` and `end` can't be `NULL`.
+** Returns a pointer to the element if found, or a pointer to the memory
+** location where the element could be inserted to keep the array sorted.
+*/
+int *binary_search(int *begin, int *end, int elt);
+
+#endif /* !BSEARCH_H_ */
diff --git a/graphs/piscine/binary_tree_dynamic/Makefile b/graphs/piscine/binary_tree_dynamic/Makefile
new file mode 100644
index 0000000..7fa9879
--- /dev/null
+++ b/graphs/piscine/binary_tree_dynamic/Makefile
@@ -0,0 +1,15 @@
+CC = gcc
+CFLAGS = -Wall -Werror -Wvla -Wextra -std=c99 -pedantic
+
+SRC = binary_tree.c binary_tree_print.c
+OBJ = $(SRC:.c=.o)
+
+.PHONY: library clean
+
+library: $(OBJ)
+	ar csr libbinary_tree.a $(OBJ)
+
+$(OBJ): $(SRC)
+
+clean:
+	$(RM) libbinary_tree.a $(OBJ)
diff --git a/graphs/piscine/binary_tree_dynamic/binary_tree.c b/graphs/piscine/binary_tree_dynamic/binary_tree.c
new file mode 100644
index 0000000..6d99e99
--- /dev/null
+++ b/graphs/piscine/binary_tree_dynamic/binary_tree.c
@@ -0,0 +1,95 @@
+#include "binary_tree.h"
+
+#include <stddef.h>
+#include <stdio.h>
+
+int size(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+        return 0;
+
+    return 1 + size(tree->left) + size(tree->right);
+}
+
+static int max(int a, int b)
+{
+    if (a > b)
+        return a;
+    return b;
+}
+
+int height(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return -1;
+    }
+
+    return 1 + max(height(tree->left), height(tree->right));
+}
+
+int is_perfect(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+        return 1;
+    return height(tree->left) == height(tree->right) && is_perfect(tree->right)
+        && is_perfect(tree->right);
+}
+
+int is_complete(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return 1;
+    }
+
+    int hg = height(tree->left);
+    int hd = height(tree->right);
+
+    if (hg - hd != 0 && hg - hd != 1)
+    {
+        return 0;
+    }
+
+    return is_complete(tree->left) && is_complete(tree->right);
+}
+
+int is_degenerate(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return 1;
+    }
+
+    if (tree->left && tree->right)
+    {
+        return 0;
+    }
+    return is_degenerate(tree->left) && is_degenerate(tree->right);
+}
+
+int is_full(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+        return 1;
+    if ((tree->left && !tree->right) || (!tree->left && tree->right))
+        return 0;
+    return is_full(tree->right) && is_full(tree->left);
+}
+
+static int is_bzt(const struct binary_tree *tree, int min, int max)
+{
+    if (tree == NULL)
+        return 1;
+    if (tree->data > max || tree->data <= min)
+        return 0;
+    return is_bzt(tree->left, min, tree->data)
+        && is_bzt(tree->right, tree->data, max);
+}
+
+int is_bst(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+        return 1;
+    return is_bzt(tree, -2147483647, 2147483647);
+}
diff --git a/graphs/piscine/binary_tree_dynamic/binary_tree.h b/graphs/piscine/binary_tree_dynamic/binary_tree.h
new file mode 100644
index 0000000..a08e4ef
--- /dev/null
+++ b/graphs/piscine/binary_tree_dynamic/binary_tree.h
@@ -0,0 +1,22 @@
+#ifndef BINARY_TREE_H
+#define BINARY_TREE_H
+
+struct binary_tree
+{
+    int data;
+    struct binary_tree *left;
+    struct binary_tree *right;
+};
+
+int size(const struct binary_tree *tree);
+int height(const struct binary_tree *tree);
+void dfs_print_prefix(const struct binary_tree *tree);
+void dfs_print_infix(const struct binary_tree *tree);
+void dfs_print_postfix(const struct binary_tree *tree);
+int is_perfect(const struct binary_tree *tree);
+int is_complete(const struct binary_tree *tree);
+int is_degenerate(const struct binary_tree *tree);
+int is_full(const struct binary_tree *tree);
+int is_bst(const struct binary_tree *tree);
+
+#endif /* !BINARY_TREE_H */
diff --git a/graphs/piscine/binary_tree_dynamic/binary_tree_print.c b/graphs/piscine/binary_tree_dynamic/binary_tree_print.c
new file mode 100644
index 0000000..bce0f77
--- /dev/null
+++ b/graphs/piscine/binary_tree_dynamic/binary_tree_print.c
@@ -0,0 +1,40 @@
+#include <stddef.h>
+#include <stdio.h>
+
+#include "binary_tree.h"
+
+void dfs_print_prefix(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return;
+    }
+
+    printf("%d ", tree->data);
+    dfs_print_prefix(tree->left);
+    dfs_print_prefix(tree->right);
+}
+
+void dfs_print_infix(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return;
+    }
+
+    dfs_print_infix(tree->left);
+    printf("%d ", tree->data);
+    dfs_print_infix(tree->right);
+}
+
+void dfs_print_postfix(const struct binary_tree *tree)
+{
+    if (tree == NULL)
+    {
+        return;
+    }
+
+    dfs_print_postfix(tree->left);
+    dfs_print_postfix(tree->right);
+    printf("%d ", tree->data);
+}
diff --git a/graphs/piscine/bit_rotation/rol.c b/graphs/piscine/bit_rotation/rol.c
new file mode 100644
index 0000000..151ebb5
--- /dev/null
+++ b/graphs/piscine/bit_rotation/rol.c
@@ -0,0 +1,5 @@
+unsigned char rol(unsigned char value, unsigned char roll)
+{
+    roll %= sizeof(unsigned char) * 8;
+    return (value << roll) | (value >> (8 * sizeof(unsigned char) - roll));
+}
diff --git a/graphs/piscine/bubble_sort/bubble_sort.c b/graphs/piscine/bubble_sort/bubble_sort.c
new file mode 100644
index 0000000..13d2ba3
--- /dev/null
+++ b/graphs/piscine/bubble_sort/bubble_sort.c
@@ -0,0 +1,25 @@
+#include "bubble_sort.h"
+
+void bubble_sort(int array[], size_t size)
+{
+    if (!array || size == 0)
+    {
+        return;
+    }
+
+    int mod;
+    do
+    {
+        mod = 0;
+        for (size_t i = 0; i < size - 1; i++)
+        {
+            if (array[i] > array[i + 1])
+            {
+                mod = 1;
+                int tmp = array[i];
+                array[i] = array[i + 1];
+                array[i + 1] = tmp;
+            }
+        }
+    } while (mod);
+}
diff --git a/graphs/piscine/bubble_sort/bubble_sort.h b/graphs/piscine/bubble_sort/bubble_sort.h
new file mode 100644
index 0000000..a33d531
--- /dev/null
+++ b/graphs/piscine/bubble_sort/bubble_sort.h
@@ -0,0 +1,8 @@
+#ifndef BUBBLE_SORT_H
+#define BUBBLE_SORT_H
+
+#include <stddef.h>
+
+void bubble_sort(int array[], size_t size);
+
+#endif /* !BUBBLE_SORT_H */
diff --git a/graphs/piscine/check_alphabet/check_alphabet.c b/graphs/piscine/check_alphabet/check_alphabet.c
new file mode 100644
index 0000000..fc540b4
--- /dev/null
+++ b/graphs/piscine/check_alphabet/check_alphabet.c
@@ -0,0 +1,25 @@
+#include "check_alphabet.h"
+
+#include <stddef.h>
+
+int check_alphabet(const char *str, const char *alphabet)
+{
+    if (alphabet == NULL || *alphabet == '\0')
+    {
+        return 1;
+    }
+
+    for (int i = 0; alphabet[i]; i++)
+    {
+        int j;
+        for (j = 0; str[j] && str[j] != alphabet[i]; j++)
+        {
+            continue;
+        }
+        if (str[j] == '\0')
+        {
+            return 0;
+        }
+    }
+    return 1;
+}
diff --git a/graphs/piscine/check_alphabet/check_alphabet.h b/graphs/piscine/check_alphabet/check_alphabet.h
new file mode 100644
index 0000000..667a20f
--- /dev/null
+++ b/graphs/piscine/check_alphabet/check_alphabet.h
@@ -0,0 +1,6 @@
+#ifndef CHECK_ALPHABET_H
+#define CHECK_ALPHABET_H
+
+int check_alphabet(const char *str, const char *alphabet);
+
+#endif /* !CHECK_ALPHABET_H */
diff --git a/graphs/piscine/clang-format/.clang-format b/graphs/piscine/clang-format/.clang-format
new file mode 100644
index 0000000..7ed8115
--- /dev/null
+++ b/graphs/piscine/clang-format/.clang-format
@@ -0,0 +1,79 @@
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Right
+AlignOperands: false
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: true
+BreakBeforeBraces: Custom
+BraceWrapping:
+    AfterEnum: true
+    AfterClass: true
+    AfterControlStatement: true
+    AfterFunction: true
+    AfterNamespace: true
+    AfterStruct: true
+    AfterUnion: true
+    AfterExternBlock: true
+    BeforeCatch: true
+    BeforeElse: true
+    IndentBraces: false
+    SplitEmptyFunction: false
+    SplitEmptyRecord: false
+    SplitEmptyNamespace: false
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeComma
+BreakStringLiterals: true
+ColumnLimit: 80
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+FixNamespaceComments: true
+ForEachMacros: ['ILIST_FOREACH', 'ILIST_FOREACH_ENTRY']
+IncludeBlocks: Regroup
+IncludeCategories:
+    - Regex: '<.*>'
+      Priority: 1
+    - Regex: '.*'
+      Priority: 2
+IndentCaseLabels: false
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+NamespaceIndentation: All
+PointerAlignment: Right
+ReflowComments: true
+SortIncludes: true
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never
diff --git a/graphs/piscine/clang-format/zaza.c b/graphs/piscine/clang-format/zaza.c
new file mode 100644
index 0000000..a6eec9a
--- /dev/null
+++ b/graphs/piscine/clang-format/zaza.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define ZAZA_SIZE 4
+
+static char get_zaza_char(size_t id)
+{
+    const int zaza[ZAZA_SIZE] = {
+        10 * 10 + 2 * 10 + 2 * 10 / 10,
+        10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+
+                * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            + 10 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+            - (1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+               + 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1
+               + 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1),
+        122,
+        (38943 * 43 - 84393 / 34583
+
+         ) % 10
+            + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
+            + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
+            + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
+            + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
+            + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
+            + 1 + 1 + 1 + 1 + 1
+    };
+    switch (id * 2 + 4 - 2 + id * 4 - 2 + -5 * id)
+
+    {
+    case (0):
+        return (zaza[0]);
+    case (1000 - 100 - 4 * 100 + 10 * 100 - 14 * 100 - (10 * 10 - 1)):
+        return (zaza[1]);
+    case (1 << 11 >> 3 << 5 >> 2 << 1 << 1 << 1 >> 1 >> 1 >> 1 << 5 >> 4 << 1
+          >> 1 >> 2 >> 9):
+        return zaza[2];
+    case (3 ^ 100) - (100 ^ 100) - (99 - 99) - (98 - 98) - (97 - 97) - (96 - 96)
+        - (95 - 95) - (94 - 94) - (93 - 93) - (92 - 92) - (91 - 91) - (90 - 90)
+        - (89 - 89) - (88 - 88) - (87 - 87) - (86 - 86) - (85 - 85) - (84 - 84)
+        - (83 - 83) - (82 - 82) - (81 - 81) - (80 - 80) - (79 - 79) - (78 - 78)
+        - (77 - 77) - (76 - 76) - (75 - 75) - (74 - 74) - (73 - 73) - (72 - 72)
+        - (71 - 71) - (70 - 70) -
+
+        (69 - 69) - (68 - 68) - (67 - 67) - (66 - 66) - (65 - 65) - (64 - 64)
+        - (63 - 63) - (62 - 62) - (61 - 61) - (60 - 60) - (59 - 59) - (58 - 58)
+        - (57 - 57) - (56 - 56) - (55 - 55) - (54 - 54) - (53 - 53) - (52 - 52)
+        - (51 - 51) - 100 - (50 - 50) - (49 - 49) - (48 - 48) - (47 - 47)
+        - (46 - 46) - (45 - 45) - (44 - 44) - (43 - 43) - (42 - 42) - (41 - 41)
+        - (40 - 40) - (39 - 39) - (38 - 38) - (37 - 37)
+
+        - (36 - 36) - (35 - 35) - (34 - 34) - (33 - 33) - (32 - 32) - (31 - 31)
+        - (30 - 30) - (29 - 29) - (28 - 28) - (27 - 27) - (26 - 26) - (25 - 25)
+        - (24 - 24) - (23 - 23) - (22 - 22) - (21 - 21) - (20 - 20) - (19 - 19)
+        - (18 - 18) - (17 - 17) - (16 - 16) - (15 - 15) - (14 - 14) - (13 - 13)
+        - (12 - 12) - (11 - 11) - (10 - 10) - (9 - 9) - (8 - 8) - (7 - 7)
+        - (6 - 6) - (5 - 5) - (4 - 4) - (3 - 3) - (2 - 2) - (1 - 1):
+        return (zaza[3]);
+    default:
+        return (0);
+    }
+}
+int main(void)
+{
+    for (size_t i = 0; i < ZAZA_SIZE; i += (i % 2 == 2 - 2) ? 1 % 2 : 1 % 2)
+    {
+        putchar(get_zaza_char(i));
+    }
+    putchar('\n');
+    return (0);
+}
diff --git a/graphs/piscine/create_files/create_files.sh b/graphs/piscine/create_files/create_files.sh
new file mode 100755
index 0000000..28dba00
--- /dev/null
+++ b/graphs/piscine/create_files/create_files.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+touch ' '
+chmod 644 ' '
+
+touch '\'
+chmod 644 '\'
+
+touch -- --
+chmod 644 -- --
+
+touch '|'
+chmod 644 '|'
+
+touch '"'
+chmod 644 '"'
+
+touch "'"
+chmod 644 "'"
+
+touch -- --\$i*\'\"\\
+chmod 644 -- --\$i*\'\"\\
+
+touch '# Exams are fun!'
+chmod 644 '# Exams are fun!'
+
+touch ";\`kill -9 0\`"
+chmod 644 ";\`kill -9 0\`"
+
+path="1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32/33/34/35/36/37/38/39/40/41/42/43/44/45/46/47/48/49/50"
+
+mkdir -p "$path"
+touch $path/farfaraway
+chmod 644 $path/farfaraway
diff --git a/graphs/piscine/cut_csv/test.csv b/graphs/piscine/cut_csv/test.csv
new file mode 100644
index 0000000..d88282b
--- /dev/null
+++ b/graphs/piscine/cut_csv/test.csv
@@ -0,0 +1,15 @@
+James;Lebron;LABron;Lakers;
+Davis;Anthony;Unibrow;Pelicans;
+Mitchell;Donovan;Spida;Jazz;
+Harden;James;TheBeard;Rockets;
+Cousins;DeMarcus;Boogie;Wariors;
+Embiid;Joel;TheProcess;76Sixers;
+Bryant;Kobe;BlackMamba;Lakers;
+Jordan;Michael;AirJordan;Bulls;
+Johnson;Earvin;Magic;Lakers;
+Howard;Dwight;Superman;Wizards;
+Westbrook;Russel;MrTripleDouble;Thunder;
+Durant;Kevin;KD;Wariors;
+George;Paul;PG-13;Thunder;
+Leonard;Kawhi;TheKlaw;Raptors;
+Irving;Kyrie;UncleDrew;Celtics;
diff --git a/graphs/piscine/cut_csv/with_cut.sh b/graphs/piscine/cut_csv/with_cut.sh
new file mode 100755
index 0000000..9618f00
--- /dev/null
+++ b/graphs/piscine/cut_csv/with_cut.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+[ $# -ne 2 ] && exit 1
+
+if ! [ -f "$1" ]; then
+    exit 1
+fi
+
+if  ! [ "$2" -eq "$2" ] 2> /dev/null; then
+    exit 1
+fi
+
+[ "$2" -lt 0 ] && exit 1
+
+if [ "$2" -gt "$(wc -l < "$1")" ]; then
+    exit 1
+fi
+
+line=$(head --lines="$2" "$1" 2> /dev/null | tail -n 1 | cut -d ';' -f 2-3 || exit 1)
+c1=$(echo "$line" | cut -d ';' -f 1)
+c2=$(echo "$line" | cut -d ';' -f 2)
+
+echo "$c1 is $c2"
diff --git a/graphs/piscine/cut_csv/with_sed.sh b/graphs/piscine/cut_csv/with_sed.sh
new file mode 100755
index 0000000..fb5e1f8
--- /dev/null
+++ b/graphs/piscine/cut_csv/with_sed.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+[ $# -ne 2 ] && exit 1
+
+if ! [ -f "$1" ]; then
+    exit 1
+fi
+
+if ! [ "$2" -eq "$2" ] 2>/dev/null; then
+    exit 1
+fi
+
+[ "$2" -lt 0 ] && exit 1
+
+if [ "$2" -gt $(wc -l < "$1") ]; then
+    exit 1
+fi
+
+i=1
+
+while IFS= read -r line; do
+    [ "$i" -eq "$2" ] && echo "$line" | sed 's/^.*;\(.*\);\(.*\);.*;$/\1 is \2/'
+    i=$(($i + 1))
+done < "$1"
diff --git a/graphs/piscine/digit/digit.c b/graphs/piscine/digit/digit.c
new file mode 100644
index 0000000..5646b13
--- /dev/null
+++ b/graphs/piscine/digit/digit.c
@@ -0,0 +1,13 @@
+unsigned int digit(int n, int k)
+{
+    if (n <= 0 || k <= 0)
+    {
+        return 0;
+    }
+
+    for (int i = 0; i < k - 1; i++)
+    {
+        n /= 10;
+    }
+    return n % 10;
+}
diff --git a/graphs/piscine/display_square/display_square.c b/graphs/piscine/display_square/display_square.c
new file mode 100644
index 0000000..9e834d7
--- /dev/null
+++ b/graphs/piscine/display_square/display_square.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+
+void display_square(int width)
+{
+    if (width <= 0)
+    {
+        return;
+    }
+
+    if (width % 2 == 0)
+    {
+        width++;
+    }
+
+    if (width == 1)
+    {
+        putchar('*');
+        putchar('\n');
+        return;
+    }
+
+    for (int i = 0; i < width; i++)
+    {
+        putchar('*');
+    }
+    putchar('\n');
+
+    for (int i = 0; i < ((width - 3) / 2); i++)
+    {
+        putchar('*');
+        for (int j = 0; j < width - 2; j++)
+        {
+            putchar(' ');
+        }
+        putchar('*');
+        putchar('\n');
+    }
+
+    for (int i = 0; i < width; i++)
+    {
+        putchar('*');
+    }
+    putchar('\n');
+}
diff --git a/graphs/piscine/dlist/Makefile b/graphs/piscine/dlist/Makefile
new file mode 100644
index 0000000..1251967
--- /dev/null
+++ b/graphs/piscine/dlist/Makefile
@@ -0,0 +1,15 @@
+CC = gcc
+CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
+
+SRC = dlist-1.c dlist-2.c dlist-3.c dlist-4.c
+OBJ = $(SRC:.c=.o)
+
+.PHONY: library clean
+
+library: $(OBJ)
+	ar csr libdlist.a $(OBJ)
+
+clean: $(OBJ)
+	$(RM) *.a $(OBJ)
+
+$(OBJ): $(SRC)
diff --git a/graphs/piscine/dlist/dlist-1.c b/graphs/piscine/dlist/dlist-1.c
new file mode 100644
index 0000000..443ebca
--- /dev/null
+++ b/graphs/piscine/dlist/dlist-1.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dlist.h"
+
+struct dlist *dlist_init(void)
+{
+    struct dlist *res = malloc(sizeof(struct dlist));
+    if (res == NULL)
+        return NULL;
+
+    res->size = 0;
+    res->head = NULL;
+    res->tail = NULL;
+    return res;
+}
+
+int dlist_push_front(struct dlist *list, int element)
+{
+    if (element < 0)
+        return 0;
+    struct dlist_item *new = malloc(sizeof(struct dlist_item));
+    if (new == NULL)
+        return 0;
+
+    new->data = element;
+    new->next = list->head;
+    new->prev = NULL;
+
+    if (list->size == 0)
+        list->tail = new;
+    else
+        list->head->prev = new;
+
+    list->head = new;
+    list->size++;
+
+    return 1;
+}
+
+void dlist_print(const struct dlist *list)
+{
+    if (list->size == 0)
+        return;
+
+    for (struct dlist_item *i = list->head; i != list->tail; i = i->next)
+    {
+        printf("%d\n", i->data);
+    }
+    printf("%d\n", list->tail->data);
+}
+
+int dlist_push_back(struct dlist *list, int element)
+{
+    if (element < 0)
+        return 0;
+    struct dlist_item *new = malloc(sizeof(struct dlist_item));
+    if (new == NULL)
+        return 0;
+
+    new->data = element;
+    new->prev = list->tail;
+    new->next = NULL;
+
+    if (list->size == 0)
+        list->head = new;
+    else
+        list->tail->next = new;
+    list->tail = new;
+    list->size++;
+
+    return 1;
+}
+
+size_t dlist_size(const struct dlist *list)
+{
+    return list->size;
+}
diff --git a/graphs/piscine/dlist/dlist-2.c b/graphs/piscine/dlist/dlist-2.c
new file mode 100644
index 0000000..5ccdaa3
--- /dev/null
+++ b/graphs/piscine/dlist/dlist-2.c
@@ -0,0 +1,113 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dlist.h"
+
+int dlist_get(const struct dlist *list, size_t index)
+{
+    if (index >= list->size)
+        return -1;
+
+    struct dlist_item *i;
+    for (i = list->head; index; index--, i = i->next)
+    {
+        continue;
+    }
+
+    return i->data;
+}
+
+int dlist_insert_at(struct dlist *list, int element, size_t index)
+{
+    if (index > list->size || element < 0)
+        return 0;
+    else if (index == list->size)
+        dlist_push_back(list, element);
+    else if (index == 0)
+        dlist_push_front(list, element);
+    else
+    {
+        struct dlist_item *new = malloc(sizeof(struct dlist_item));
+        if (new == NULL)
+            return 0;
+        new->data = element;
+
+        struct dlist_item *i;
+        for (i = list->head; index - 1; index--, i = i->next)
+            continue;
+        new->next = i->next;
+        i->next->prev = new;
+        i->next = new;
+        new->prev = i;
+        list->size++;
+    }
+    return 1;
+}
+
+int dlist_find(const struct dlist *list, int element)
+{
+    int index = 0;
+    struct dlist_item *i;
+    for (i = list->head; i && i->data != element; index++, i = i->next)
+        continue;
+    if (!i)
+        return -1;
+    return index;
+}
+
+int dlist_remove_at(struct dlist *list, size_t index)
+{
+    if (index >= list->size)
+        return -1;
+    int res;
+    struct dlist_item *item;
+    if (list->size == 1)
+    {
+        item = list->head;
+        res = list->head->data;
+        list->head = NULL;
+        list->tail = NULL;
+    }
+    else if (index == 0)
+    {
+        item = list->head;
+        res = item->data;
+        item->next->prev = NULL;
+        list->head = item->next;
+    }
+    else if (index == list->size - 1)
+    {
+        item = list->tail;
+        res = item->data;
+        item->prev->next = NULL;
+        list->tail = item->prev;
+    }
+    else
+    {
+        for (item = list->head; index; index--, item = item->next)
+            continue;
+
+        res = item->data;
+        item->prev->next = item->next;
+        item->next->prev = item->prev;
+    }
+
+    free(item);
+    list->size--;
+    return res;
+}
+
+void dlist_clear(struct dlist *list)
+{
+    if (list->size == 0)
+        return;
+    for (struct dlist_item *i = list->head; i;)
+    {
+        struct dlist_item *tmp = i->next;
+        free(i);
+        i = tmp;
+    }
+    list->size = 0;
+    list->head = NULL;
+    list->tail = NULL;
+}
diff --git a/graphs/piscine/dlist/dlist-3.c b/graphs/piscine/dlist/dlist-3.c
new file mode 100644
index 0000000..22b4b52
--- /dev/null
+++ b/graphs/piscine/dlist/dlist-3.c
@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dlist.h"
+
+void dlist_map_square(struct dlist *list)
+{
+    for (struct dlist_item *i = list->head; i; i = i->next)
+    {
+        i->data *= i->data;
+    }
+}
+
+void dlist_reverse(struct dlist *list)
+{
+    struct dlist_item *tmp;
+    for (struct dlist_item *i = list->head; i; i = i->prev)
+    {
+        tmp = i->next;
+        i->next = i->prev;
+        i->prev = tmp;
+    }
+    tmp = list->tail;
+    list->tail = list->head;
+    list->head = tmp;
+}
+
+struct dlist *dlist_split_at(struct dlist *list, size_t index)
+{
+    if (list->size == 0)
+        return dlist_init();
+    if (index >= list->size)
+    {
+        return NULL;
+    }
+
+    struct dlist *new = dlist_init();
+    if (new == NULL)
+        return NULL;
+    new->size = list->size - index;
+    list->size = index;
+
+    struct dlist_item *i;
+    for (i = list->head; index; index--, i = i->next)
+    {
+        continue;
+    }
+
+    new->head = i;
+    new->tail = list->tail;
+    list->tail = i->prev;
+    if (i->prev)
+    {
+        i->prev->next = NULL;
+    }
+    else
+    {
+        list->head = NULL;
+    }
+    i->prev = NULL;
+    return new;
+}
+
+void dlist_concat(struct dlist *list1, struct dlist *list2)
+{
+    if (list2->head == NULL)
+        return;
+    if (list1->tail == NULL)
+    {
+        list1->head = list2->head;
+        list1->tail = list2->tail;
+        list1->size = list2->size;
+        return;
+    }
+
+    list1->tail->next = list2->head;
+    list2->head->prev = list1->tail;
+    list1->tail = list2->tail;
+    list1->size += list2->size;
+    list2->size = 0;
+    list2->head = NULL;
+    list2->tail = NULL;
+}
diff --git a/graphs/piscine/dlist/dlist-4.c b/graphs/piscine/dlist/dlist-4.c
new file mode 100644
index 0000000..9ed7aaa
--- /dev/null
+++ b/graphs/piscine/dlist/dlist-4.c
@@ -0,0 +1,97 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "dlist.h"
+
+size_t max(size_t a, size_t b)
+{
+    if (a >= b)
+    {
+        return a;
+    }
+    return b;
+}
+
+size_t min(size_t a, size_t b)
+{
+    if (a <= b)
+    {
+        return a;
+    }
+    return b;
+}
+
+size_t min_3(size_t a, size_t b, size_t c)
+{
+    if (a <= b)
+    {
+        if (a <= c)
+        {
+            return a;
+        }
+        return c;
+    }
+    else
+    {
+        if (b <= c)
+        {
+            return b;
+        }
+        return c;
+    }
+}
+
+size_t my_strlen(const int *s)
+{
+    size_t i;
+    for (i = 0; s[i] != -1; i++)
+    {
+        continue;
+    }
+    return i;
+}
+
+size_t levenshtein(const int *s1, const int *s2)
+{
+    size_t l1 = my_strlen(s1);
+    size_t l2 = my_strlen(s2);
+    if (min(l1, l2) == 0)
+    {
+        return max(l1, l2);
+    }
+
+    if (s1[0] == s2[0])
+    {
+        return levenshtein(s1 + 1, s2 + 1);
+    }
+
+    size_t lev1 = levenshtein(s1 + 1, s2);
+    size_t lev2 = levenshtein(s1, s2 + 1);
+    size_t lev3 = levenshtein(s1 + 1, s2 + 1);
+
+    return 1 + min_3(lev1, lev2, lev3);
+}
+
+int *to_str(const struct dlist *l)
+{
+    int *res = malloc((l->size + 1) * sizeof(int));
+    res[l->size] = -1;
+    size_t j = 0;
+    for (struct dlist_item *i = l->head; i; i = i->next, j++)
+    {
+        res[j] = i->data;
+    }
+    return res;
+}
+
+unsigned int dlist_levenshtein(const struct dlist *list1,
+                               const struct dlist *list2)
+{
+    int *l1 = to_str(list1);
+    int *l2 = to_str(list2);
+
+    unsigned int res = levenshtein(l1, l2);
+    free(l1);
+    free(l2);
+    return res;
+}
diff --git a/graphs/piscine/dlist/dlist.h b/graphs/piscine/dlist/dlist.h
new file mode 100644
index 0000000..97cde1a
--- /dev/null
+++ b/graphs/piscine/dlist/dlist.h
@@ -0,0 +1,44 @@
+#ifndef DLIST_H
+#define DLIST_H
+
+#include <stddef.h>
+
+struct dlist_item
+{
+    int data;
+    struct dlist_item *next;
+    struct dlist_item *prev;
+};
+
+struct dlist
+{
+    size_t size;
+    struct dlist_item *head;
+    struct dlist_item *tail;
+};
+
+// Threshold 1
+struct dlist *dlist_init(void);
+int dlist_push_front(struct dlist *list, int element);
+void dlist_print(const struct dlist *list);
+int dlist_push_back(struct dlist *list, int element);
+size_t dlist_size(const struct dlist *list);
+
+// Threshold 2
+int dlist_get(const struct dlist *list, size_t index);
+int dlist_insert_at(struct dlist *list, int element, size_t index);
+int dlist_find(const struct dlist *list, int element);
+int dlist_remove_at(struct dlist *list, size_t index);
+void dlist_clear(struct dlist *list);
+
+// Threshold 3
+void dlist_map_square(struct dlist *list);
+void dlist_reverse(struct dlist *list);
+struct dlist *dlist_split_at(struct dlist *list, size_t index);
+void dlist_concat(struct dlist *list1, struct dlist *list2);
+
+// Threshold 4
+unsigned int dlist_levenshtein(const struct dlist *list1,
+                               const struct dlist *list2);
+
+#endif /* !DLIST_H */
diff --git a/graphs/piscine/element_count/element_count.c b/graphs/piscine/element_count/element_count.c
new file mode 100644
index 0000000..cec47ae
--- /dev/null
+++ b/graphs/piscine/element_count/element_count.c
@@ -0,0 +1,10 @@
+#include "element_count.h"
+
+size_t element_count(int *begin, int *end)
+{
+    if (!begin || !end || begin >= end)
+    {
+        return 0;
+    }
+    return end - begin;
+}
diff --git a/graphs/piscine/element_count/element_count.h b/graphs/piscine/element_count/element_count.h
new file mode 100644
index 0000000..57412ed
--- /dev/null
+++ b/graphs/piscine/element_count/element_count.h
@@ -0,0 +1,8 @@
+#ifndef ELEMENT_COUNT_H
+#define ELEMENT_COUNT_H
+
+#include <stddef.h>
+
+size_t element_count(int *begin, int *end);
+
+#endif /* !ELEMENT_COUNT_H */
diff --git a/graphs/piscine/evalexpr/Makefile b/graphs/piscine/evalexpr/Makefile
new file mode 100644
index 0000000..280f19c
--- /dev/null
+++ b/graphs/piscine/evalexpr/Makefile
@@ -0,0 +1,23 @@
+CC = gcc
+CFLAGS = -Wall -Werror -Wextra -pedantic -std=c99 -Wvla
+AFLAGS = -fsanitize=address
+
+SRC=src/stack.c src/evalrpn.c src/shunting_yard.c src/fifo_access.c src/fifo_setup_destroy.c src/evalexpr.c
+SRC_TEST=tests/unit_tests.c
+#OBJ=src/stack.o src/evalrpn.o
+OBJ=$(SRC:.c=.o)
+#OBJ_TEST=$(SRC_TEST:.c=.o)
+
+all: $(OBJ)
+	$(CC) -o evalexpr $(OBJ)
+
+$(OBJ): $(SRC)
+
+check: #$(OBJ) $(OBJ_TEST)
+#	$(CC) $(CFLAGS) -o evaltest $(OBJ) $(OBJ_TEST) -lcriterion
+	tests/tests.sh
+
+.PHONY: clean
+
+clean:
+	rm $(OBJ) evalexpr
diff --git a/graphs/piscine/evalexpr/src/evalexpr.c b/graphs/piscine/evalexpr/src/evalexpr.c
new file mode 100644
index 0000000..5012355
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/evalexpr.c
@@ -0,0 +1,93 @@
+#include "evalexpr.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER_SIZE 10
+
+char *get_input(void)
+{
+    size_t r;
+    char buf[BUFFER_SIZE];
+    size_t size = 0;
+    char *expr = malloc(size * sizeof(char) + 1);
+    if (expr == NULL)
+        return NULL;
+    expr[0] = '\0';
+    do
+    {
+        r = fread(buf, sizeof(char), BUFFER_SIZE - 1, stdin);
+        if (r != 0)
+        {
+            buf[r] = '\0';
+            size += r;
+            char *tmp = realloc(expr, size * sizeof(char) + 1);
+            if (tmp == NULL)
+            {
+                free(expr);
+                return NULL;
+            }
+            expr = tmp;
+            strcat(expr, buf);
+        }
+    } while (r != 0);
+    if (size == 0)
+    {
+        free(expr);
+        return NULL;
+    }
+    if (expr[size - 1] == '\n')
+        expr[size - 1] = '\0';
+    return expr;
+}
+
+void cleanup(char *expr, char *rpn)
+{
+    free(expr);
+    free(rpn);
+}
+
+int main(int argc, char **argv)
+{
+    if ((argc == 2 && strcmp(argv[1], "-rpn") != 0) || (argc > 2))
+        return 4;
+    char *expr = get_input();
+    if (expr == NULL)
+        return 4;
+    if (argc == 1)
+    {
+        char *rpn;
+        int e = shunting_yard(expr, &rpn);
+        if (e != 0)
+            return e;
+        // call shunting yard
+        int retval;
+        e = evalrpn(rpn, &retval);
+        if (e != 0)
+        {
+            cleanup(expr, rpn);
+            return e;
+        }
+        // FREE RPN
+        printf("%d\n", retval);
+        cleanup(expr, rpn);
+        // return
+        return 0;
+    }
+
+    if (argc == 2 && strcmp(argv[1], "-rpn") == 0)
+    {
+        // call rpn eval
+        int retval;
+        int e = evalrpn(expr, &retval);
+        printf("%d\n", retval);
+        // return
+        free(expr);
+        if (e != 0)
+            return e;
+        return 0;
+    }
+
+    return 4;
+}
diff --git a/graphs/piscine/evalexpr/src/evalexpr.h b/graphs/piscine/evalexpr/src/evalexpr.h
new file mode 100644
index 0000000..d440ae1
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/evalexpr.h
@@ -0,0 +1,43 @@
+#ifndef EVALEXPR_H
+#define EVALEXPR_H
+
+#include <stddef.h>
+
+#include "fifo.h"
+#include "stack.h"
+#include "stack_struct.h"
+
+enum token_type
+{
+    NUMBER = 0,
+    SUB = 1,
+    ADD = 1,
+    MOD = 2,
+    DIV = 2,
+    MUL = 2,
+    EXP = 3,
+    UN_PLUS = 4,
+    UN_MINUS = 4,
+    PAR_LEFT = 5,
+    PAR_RIGHT = 5,
+    WRONG_TOKEN = -1,
+};
+
+struct token
+{
+    enum token_type type;
+    int value;
+};
+
+// evalrpn
+int parse_number(const char *expr, size_t *offset);
+int get_operands(struct stack **s, int *op1, int *op2);
+int my_pow(int a, int b);
+int evalrpn(const char *expr, int *retval);
+
+// shunting yard
+int opcmp(struct token *op1, struct token *op2);
+enum token_type get_type(char op);
+int shunting_yard(const char *expr, char **rpn);
+
+#endif /* ! EVALEXPR_H */
diff --git a/graphs/piscine/evalexpr/src/evalrpn.c b/graphs/piscine/evalexpr/src/evalrpn.c
new file mode 100644
index 0000000..db493eb
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/evalrpn.c
@@ -0,0 +1,145 @@
+#include <ctype.h>
+
+#include "evalexpr.h"
+
+int parse_number(const char *expr, size_t *offset)
+{
+    for (*offset = 0;
+         expr[*offset] && expr[*offset] >= '0' && expr[*offset] <= '9';
+         (*offset)++)
+    {
+        continue;
+    }
+    (*offset)--;
+
+    int res = 0;
+    int pow = 1;
+    for (size_t n = 0; n <= *offset; n++, pow *= 10)
+    {
+        res += (expr[*offset - n] - '0') * pow;
+    }
+
+    return res;
+}
+
+int get_operands(struct stack **s, int *op1, int *op2)
+{
+    if (*s == NULL)
+    {
+        return 2;
+    }
+    *op1 = stack_peek(*s);
+    *s = stack_pop(*s);
+    if (*s == NULL)
+    {
+        return 2;
+    }
+    *op2 = stack_peek(*s);
+    *s = stack_pop(*s);
+    return 0;
+}
+
+// Computes a to the bth
+int my_pow(int a, int b)
+{
+    if (b == 0)
+    {
+        return 1;
+    }
+    if (a == 0)
+    {
+        return 0;
+    }
+
+    int res = 1;
+    int c = b / 2;
+    while (c != 0)
+    {
+        res *= a * a;
+        c /= 2;
+    }
+    if (b % 2 != 0)
+        res *= a;
+    return res;
+}
+
+int dispatch(const char c, struct stack **s, int op1, int op2)
+{
+    switch (c)
+    {
+    case '*':
+        *s = stack_push(*s, op1 * op2);
+        break;
+    case '+':
+        *s = stack_push(*s, op1 + op2);
+        break;
+    case '-':
+        *s = stack_push(*s, op2 - op1);
+        break;
+    case '/':
+        if (op1 == 0)
+        {
+            return 3;
+        }
+        *s = stack_push(*s, op2 / op1);
+        break;
+    case '%':
+        if (op1 == 0)
+        {
+            return 3;
+        }
+        *s = stack_push(*s, op2 % op1);
+        break;
+    case '^':
+        if (op1 < 0)
+        {
+            return 3;
+        }
+        *s = stack_push(*s, my_pow(op2, op1));
+        break;
+    default:
+        return 1;
+    }
+    return 0;
+}
+
+int evalrpn(const char *expr, int *retval)
+{
+    struct stack *s = NULL;
+
+    for (size_t i = 0; expr[i]; i++)
+    {
+        if (expr[i] >= '0' && expr[i] <= '9')
+        {
+            size_t offset;
+            int val = parse_number(expr + i, &offset);
+            s = stack_push(s, val);
+            i += offset;
+        }
+        else if (isspace(expr[i]))
+            continue;
+        else
+        {
+            int op1;
+            int op2;
+            if (get_operands(&s, &op1, &op2) == 2)
+            {
+                return 2;
+            }
+
+            int d = dispatch(expr[i], &s, op1, op2);
+            if (d != 0)
+            {
+                return d;
+            }
+        }
+    }
+
+    if (s == NULL)
+    {
+        return 0;
+    }
+    *retval = stack_peek(s);
+    s = stack_pop(s);
+    return (!s) ? 0 : 2;
+}
diff --git a/graphs/piscine/evalexpr/src/fifo.h b/graphs/piscine/evalexpr/src/fifo.h
new file mode 100644
index 0000000..b330eac
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/fifo.h
@@ -0,0 +1,29 @@
+#ifndef FIFO_H
+#define FIFO_H
+
+#include <stddef.h>
+
+#include "evalexpr.h"
+
+struct list
+{
+    struct token *data;
+    struct list *next;
+};
+
+struct fifo
+{
+    struct list *head;
+    struct list *tail;
+    size_t size;
+};
+
+struct fifo *fifo_init(void);
+size_t fifo_size(struct fifo *fifo);
+void fifo_push(struct fifo *fifo, struct token *elt);
+struct token *fifo_head(struct fifo *fifo);
+void fifo_pop(struct fifo *fifo);
+void fifo_clear(struct fifo *fifo);
+void fifo_destroy(struct fifo *fifo);
+
+#endif /* !FIFO_H */
diff --git a/graphs/piscine/evalexpr/src/fifo_access.c b/graphs/piscine/evalexpr/src/fifo_access.c
new file mode 100644
index 0000000..1986a09
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/fifo_access.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "fifo.h"
+
+size_t fifo_size(struct fifo *fifo)
+{
+    return fifo->size;
+}
+
+void fifo_push(struct fifo *fifo, struct token *elt)
+{
+    struct list *new = malloc(sizeof(struct list));
+    if (new == NULL)
+    {
+        return;
+    }
+    new->data = elt;
+
+    if (fifo_size(fifo) == 0)
+    {
+        fifo->head = new;
+    }
+    new->next = NULL;
+    if (fifo_size(fifo) != 0)
+    {
+        fifo->tail->next = new;
+    }
+    fifo->tail = new;
+
+    fifo->size++;
+}
+
+struct token *fifo_head(struct fifo *fifo)
+{
+    return fifo->head->data;
+}
+
+void fifo_pop(struct fifo *fifo)
+{
+    if (fifo_size(fifo) == 0)
+    {
+        return;
+    }
+    if (fifo_size(fifo) == 1)
+    {
+        free(fifo->head->data);
+        free(fifo->head);
+        fifo->head = NULL;
+        fifo->tail = NULL;
+        fifo->size = 0;
+        return;
+    }
+
+    struct list *tmp = fifo->head->next;
+    free(fifo->head->data);
+    free(fifo->head);
+    fifo->head = tmp;
+
+    fifo->size--;
+}
diff --git a/graphs/piscine/evalexpr/src/fifo_setup_destroy.c b/graphs/piscine/evalexpr/src/fifo_setup_destroy.c
new file mode 100644
index 0000000..0f99ad0
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/fifo_setup_destroy.c
@@ -0,0 +1,44 @@
+#include <stdlib.h>
+
+#include "fifo.h"
+
+struct fifo *fifo_init(void)
+{
+    struct fifo *f = malloc(sizeof(struct fifo));
+    if (f == NULL)
+    {
+        return NULL;
+    }
+
+    f->size = 0;
+    f->head = NULL;
+    f->tail = NULL;
+
+    return f;
+}
+
+void fifo_clear(struct fifo *fifo)
+{
+    for (struct list *l = fifo->head; l != fifo->tail;)
+    {
+        struct list *tmp = l->next;
+        free(l->data);
+        free(l);
+        l = tmp;
+    }
+    if (fifo->tail)
+    {
+        free(fifo->tail->data);
+        free(fifo->tail);
+    }
+
+    fifo->head = NULL;
+    fifo->tail = NULL;
+    fifo->size = 0;
+}
+
+void fifo_destroy(struct fifo *fifo)
+{
+    fifo_clear(fifo);
+    free(fifo);
+}
diff --git a/graphs/piscine/evalexpr/src/shunting_yard.c b/graphs/piscine/evalexpr/src/shunting_yard.c
new file mode 100644
index 0000000..2db5fc8
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/shunting_yard.c
@@ -0,0 +1,199 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "evalexpr.h"
+
+enum assoc
+{
+    NONE,
+    RIGHT,
+    LEFT,
+};
+
+int opcmp(struct token *op1, struct token *op2)
+{
+    return op1->type - op2->type;
+}
+
+enum assoc get_assoc(struct token *op)
+{
+    if (op->type == EXP)
+    {
+        return RIGHT;
+    }
+    return LEFT;
+}
+
+enum token_type get_type(char op)
+{
+    switch (op)
+    {
+    case '*':
+        return MUL;
+    case '/':
+        return DIV;
+    case '-':
+        return SUB;
+    case '+':
+        return ADD;
+    case '%':
+        return MOD;
+    case '^':
+        return EXP;
+    case '(':
+        return PAR_LEFT;
+    case ')':
+        return PAR_RIGHT;
+    default:
+        return WRONG_TOKEN;
+    }
+}
+
+char *fifo_to_expr(struct fifo *output, size_t size_offset)
+{
+    char *res = malloc((2 * fifo_size(output) + size_offset) * sizeof(char));
+    if (!res)
+    {
+        fifo_destroy(output);
+        return NULL;
+    }
+    res[2 * fifo_size(output) + size_offset - 1] = '\0';
+    size_t i = 0;
+    while (fifo_size(output) > 0)
+    {
+        if (fifo_head(output)->type == NUMBER)
+        {
+            i += sprintf(res + i, "%d", fifo_head(output)->value) - 1;
+        }
+        else
+        {
+            res[i] = fifo_head(output)->value;
+        }
+        fifo_pop(output);
+        i++;
+        if (fifo_size(output) != 0)
+        {
+            res[i] = ' ';
+            i++;
+        }
+    }
+    fifo_destroy(output);
+    return res;
+}
+
+int handle_rpar(struct tstack **opstack, struct fifo *output, struct token **t)
+{
+    while (*opstack)
+    {
+        struct token *o2 = tstack_peek(*opstack);
+        if (o2->value == '(')
+        {
+            free(o2);
+            break;
+        }
+        *opstack = tstack_pop(*opstack);
+        fifo_push(output, o2);
+    }
+    if (*opstack == NULL)
+    {
+        free(*t);
+        fifo_destroy(output);
+        return 2;
+    }
+    free(*t);
+    *opstack = tstack_pop(*opstack);
+    return 0;
+}
+
+int empty_opstack(struct tstack **opstack, struct fifo *output)
+{
+    while (*opstack)
+    {
+        struct token *t = tstack_peek(*opstack);
+        if (t->value == '(' || t->value == ')')
+        {
+            fifo_destroy(output);
+            return 1;
+        }
+        *opstack = tstack_pop(*opstack);
+        fifo_push(output, t);
+    }
+    return 0;
+}
+
+void pop_ops(struct tstack **opstack, struct fifo *output, struct token *t)
+{
+    while (*opstack)
+    {
+        struct token *o2 = tstack_peek(*opstack);
+        if (!(o2->value != '('
+              && (opcmp(t, o2) < 0
+                  || (opcmp(t, o2) == 0 && get_assoc(t) == LEFT))))
+        {
+            break;
+        }
+
+        *opstack = tstack_pop(*opstack);
+        fifo_push(output, o2);
+    }
+}
+
+void handle_numbers(struct fifo *output, size_t *i, int *size_offset,
+                    const char *expr)
+{
+    size_t offset;
+    int val = parse_number(expr + *i, &offset);
+    struct token *t = malloc(sizeof(struct token));
+    t->type = NUMBER;
+    t->value = val;
+    fifo_push(output, t);
+    *i += offset;
+    *size_offset += offset;
+}
+
+int shunting_yard(const char *expr, char **rpn)
+{
+    struct fifo *output = fifo_init();
+    struct tstack *opstack = NULL;
+    int size_offset = 0;
+    for (size_t i = 0; expr[i]; i++)
+    {
+        if (expr[i] >= '0' && expr[i] <= '9')
+        {
+            handle_numbers(output, &i, &size_offset, expr);
+        }
+        else if (expr[i] != ' ')
+        {
+            struct token *t = malloc(sizeof(struct token));
+            t->value = expr[i];
+            if ((t->type = get_type(expr[i])) == WRONG_TOKEN)
+            {
+                free(t);
+                return 1;
+            }
+            if (t->value == '(')
+            {
+                opstack = tstack_push(opstack, t);
+                continue;
+            }
+            else if (t->value == ')')
+            {
+                if (handle_rpar(&opstack, output, &t) != 0)
+                    return 2;
+                continue;
+            }
+            pop_ops(&opstack, output, t);
+            opstack = tstack_push(opstack, t);
+        }
+    }
+
+    if (empty_opstack(&opstack, output) != 0)
+    {
+        return 1;
+    }
+    *rpn = fifo_to_expr(output, size_offset);
+    if (!*rpn)
+        return 4;
+
+    return 0;
+}
diff --git a/graphs/piscine/evalexpr/src/stack.c b/graphs/piscine/evalexpr/src/stack.c
new file mode 100644
index 0000000..14f659e
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/stack.c
@@ -0,0 +1,57 @@
+#include "stack.h"
+
+#include <stdlib.h>
+
+struct stack *stack_push(struct stack *s, int e)
+{
+    struct stack *new = malloc(sizeof(struct stack));
+    new->data = e;
+    new->next = NULL;
+
+    new->next = s;
+    return new;
+}
+
+struct stack *stack_pop(struct stack *s)
+{
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    struct stack *res = s->next;
+    free(s);
+    return res;
+}
+
+int stack_peek(struct stack *s)
+{
+    return s->data;
+}
+
+struct tstack *tstack_push(struct tstack *s, struct token *e)
+{
+    struct tstack *new = malloc(sizeof(struct tstack));
+    new->token = e;
+    new->next = NULL;
+
+    new->next = s;
+    return new;
+}
+
+struct tstack *tstack_pop(struct tstack *s)
+{
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    struct tstack *res = s->next;
+    free(s);
+    return res;
+}
+
+struct token *tstack_peek(struct tstack *s)
+{
+    return s->token;
+}
diff --git a/graphs/piscine/evalexpr/src/stack.h b/graphs/piscine/evalexpr/src/stack.h
new file mode 100644
index 0000000..d08e465
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/stack.h
@@ -0,0 +1,20 @@
+#ifndef STACK_H
+#define STACK_H
+
+#include "evalexpr.h"
+#include "stack_struct.h"
+
+struct tstack
+{
+    struct token *token;
+    struct tstack *next;
+};
+
+struct stack *stack_push(struct stack *s, int e);
+struct stack *stack_pop(struct stack *s);
+int stack_peek(struct stack *s);
+
+struct tstack *tstack_push(struct tstack *s, struct token *e);
+struct tstack *tstack_pop(struct tstack *s);
+struct token *tstack_peek(struct tstack *s);
+#endif /* !STACK_H */
diff --git a/graphs/piscine/evalexpr/src/stack_struct.h b/graphs/piscine/evalexpr/src/stack_struct.h
new file mode 100644
index 0000000..105cd5d
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/stack_struct.h
@@ -0,0 +1,10 @@
+#ifndef STACK_STRUCT_H
+#define STACK_STRUCT_H
+
+struct stack
+{
+    int data;
+    struct stack *next;
+};
+
+#endif /* ! STACK_STRUCT_H */
diff --git a/graphs/piscine/evalexpr/tests/tests.sh b/graphs/piscine/evalexpr/tests/tests.sh
new file mode 100755
index 0000000..920f09b
--- /dev/null
+++ b/graphs/piscine/evalexpr/tests/tests.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+
+REF_OUT="ref.out"
+TEST_OUT="test.out"
+
+testrpn()
+{
+    echo "$2" > "$REF_OUT"
+    echo "Evaluating '$1' in RPN notation..."
+    echo "$1" | ./evalexpr -rpn > "$TEST_OUT"
+    diff "$REF_OUT" "$TEST_OUT" && echo "Success"
+}
+
+testeval()
+{
+    echo "$1" | bc 2> /dev/null > "$REF_OUT"
+    echo "Evaluating '$1' in standard notation..."
+    echo "$1" | ./evalexpr > "$TEST_OUT"
+    diff "$REF_OUT" "$TEST_OUT" && echo "Success"
+}
+
+testerror()
+{
+    echo "Testing error code '$2'..."
+    echo "$1" | ./evalexpr
+    error="$(echo $?)"
+    [ "$2" -eq "$error" ] && echo "Succesful failure" || echo "Wrong error $error"
+}
+
+clean()
+{
+    rm "$REF_OUT" "$TEST_OUT"
+}
+
+# RPN
+
+echo "Tests for RPN:"
+echo "======"
+
+testrpn "1 1 +" 2
+testrpn "5 2 2 ^ 3 + *" 35
+testrpn "10 6 9 3 + 0 11 - * / * 17 + 5 +" 22
+testrpn "3 4 5 * 3 + -" "-20"
+testrpn "3 2 % 9 3 1 2 + * / -" 0
+
+echo
+echo "============================================="
+echo
+
+# Standard
+
+echo "Tests for standard notation:"
+echo "======"
+
+testeval "1 + 1"
+testeval " 1 + 1 +1  "
+testeval "2 * 2"
+testeval "5 * (2 + 4)"
+testeval "5 * (2 % 4)"
+testeval "  5 *(2 ^4)    "
+testeval "  5 *(2 ^4   "
+
+echo
+echo "============================================="
+echo
+
+# Errors
+
+echo "Error tests:"
+echo "======"
+
+testerror "" 0
+testerror "a+1" 1
+testerror "1%0" 3
+
+echo "Testing error code '4'..."
+./evalexpr --toto 2> /dev/null
+echo $?
+
+# Cleanup
+
+clean
diff --git a/graphs/piscine/evalexpr/tests/unit_tests.c b/graphs/piscine/evalexpr/tests/unit_tests.c
new file mode 100644
index 0000000..ed445a0
--- /dev/null
+++ b/graphs/piscine/evalexpr/tests/unit_tests.c
@@ -0,0 +1,208 @@
+#include <criterion/criterion.h>
+#include <criterion/assert.h>
+#include <stddef.h>
+#include <string.h>
+
+#include "../src/evalexpr.h"
+
+TestSuite(parse_number);
+
+Test(parse_number, parse_42)
+{
+    size_t o;
+    int actual = parse_number("42", &o);
+    cr_expect(actual == 42, "Attendu : %d, renvoyé : %d", 42, actual);
+    cr_expect(o == 1, "Décalage attendu : %d, renvoyé : %zu", 1, o);
+}
+
+Test(parse_number, parse_4)
+{
+    size_t o;
+    int actual = parse_number("4", &o);
+    cr_expect(actual == 4, "Attendu : %d, renvoyé : %d", 4, actual);
+    cr_expect(o == 0, "Décalage attendu : %d, renvoyé : %zu", 0, o);
+}
+
+TestSuite(my_pow);
+
+Test(my_pow, my_pow00)
+{
+    int actual = my_pow(0, 0);
+    cr_expect(actual == 1, "Attendu : %d, renvoyé : %d", 1, actual);
+}
+
+Test(my_pow, my_pown0)
+{
+    int actual = my_pow(50, 0);
+    cr_expect(actual == 1, "Attendu : %d, renvoyé : %d", 1, actual);
+}
+Test(my_pow, my_pow0n)
+{
+    int actual = my_pow(0, 42);
+    cr_expect(actual == 0, "Attendu : %d, renvoyé : %d", 0, actual);
+}
+Test(my_pow, my_powab)
+{
+    int actual = my_pow(3,3);
+    cr_expect(actual == 27, "Attendu : %d, renvoyé : %d", 27, actual);
+}
+Test(my_pow, my_powab_2)
+{
+    int actual = my_pow(4, 2);
+    cr_expect(actual == 16, "Attendu : %d, renvoyé : %d", 16, actual);
+}
+Test(my_pow, my_powab_3)
+{
+    int actual = my_pow(10, 3);
+    cr_expect(actual == 1000, "Attendu : %d, renvoyé : %d", 1000, actual);
+}
+Test(my_pow, my_pow1n)
+{
+    int actual = my_pow(1, 50);
+    cr_expect(actual == 1, "Attendu : %d, renvoyé : %d", 1, actual);
+}
+
+TestSuite(RPN);
+
+Test(RPN, evalrpn_easiest)
+{
+    const char test[] = "1 1 +";
+    int expected = 0;
+    int retval;
+    int res = 2;
+    int actual = evalrpn(test, &retval);
+    cr_expect(actual == expected, "%s => Retour attendu : %d, renvoyé : %d", test, expected, actual);
+    cr_expect(retval == res, "%s => Résultat attendu : %d, reçu : %d", test, res, retval);
+}
+Test(RPN, evalrpn_35)
+{
+    const char test[] = "5 2 2 ^ 3 + *";
+    int expected = 0;
+    int retval;
+    int res = 35;
+    int actual = evalrpn(test, &retval);
+    cr_expect(actual == expected, "%s => Retour attendu : %d, renvoyé : %d", test, expected, actual);
+    cr_expect(retval == res, "%s => Résultat attendu : %d, reçu : %d", test, res, retval);
+}
+Test(RPN, evalrpn_22)
+{
+    const char test[] = "10 6 9 3 + 0 11 - * / * 17 + 5 +";
+    int expected = 0;
+    int retval;
+    int res = 22;
+    int actual = evalrpn(test, &retval);
+    cr_expect(actual == expected, "%s => Retour attendu : %d, renvoyé : %d", test, expected, actual);
+    cr_expect(retval == res, "%s => Résultat attendu : %d, reçu : %d", test, res, retval);
+}
+Test(RPN, evalrpn_minus20)
+{
+    const char test[] = "3 4 5 * 3 + -";
+    int expected = 0;
+    int retval;
+    int res = -20;
+    int actual = evalrpn(test, &retval);
+    cr_expect(actual == expected, "%s => Retour attendu : %d, renvoyé : %d", test, expected, actual);
+    cr_expect(retval == res, "%s => Résultat attendu : %d, reçu : %d", test, res, retval);
+}
+Test(RPN, evalrpn_zero)
+{
+    const char test[] = "3 2 % 9 3 1 2 + * / -";
+    int expected = 0;
+    int retval;
+    int res = 0;
+    int actual = evalrpn(test, &retval);
+    cr_expect(actual == expected, "%s => Retour attendu : %d, renvoyé : %d", test, expected, actual);
+    cr_expect(retval == res, "%s => Résultat attendu : %d, reçu : %d", test, res, retval);
+}
+
+TestSuite(Precedence);
+
+Test(Precedence, parenthesis_above_all)
+{
+    struct token pleft = { PAR_LEFT, '(' };
+    struct token pright = { PAR_RIGHT, ')' };
+    struct token unplus = { UN_PLUS, '+' };
+    struct token exp = { EXP, '^' };
+    struct token mul = { MUL, '*' };
+    struct token minus = { SUB, '-' };
+    int eq = opcmp(&pleft, &pright);
+    int sup = opcmp(&pleft, &unplus);
+    int inf = opcmp(&unplus, &pright);
+    int parftw = opcmp(&pleft, &exp);
+    int par4ever = opcmp(&pright, &mul);
+    int paragain = opcmp(&pright, &minus);
+    cr_expect(eq == 0, "Wrong order (equal)");
+    cr_expect(sup > 0, "Wrong order (>)");
+    cr_expect(inf < 0, "Wrong order (<)");
+    cr_expect(parftw > 0, "Wrong order (>)");
+    cr_expect(par4ever > 0, "Wrong order (>)");
+    cr_expect(paragain > 0, "Wrong order (>)");
+}
+
+Test(Precedence, other_precedence_tests)
+{
+    struct token exp = { EXP, '^' };
+    struct token mul = { MUL, '*' };
+    struct token unplus = { UN_PLUS, '+' };
+    struct token minus = { SUB, '-' };
+    struct token plus = { ADD, '+' };
+    int eq = opcmp(&minus, &plus);
+    int sup = opcmp(&exp, &mul);
+    int inf = opcmp(&plus, &unplus);
+
+    cr_expect(eq == 0, "Wrong order (equal)");
+    cr_expect(sup > 0, "Wrong order (>)");
+    cr_expect(inf < 0, "Wrong order (<)");
+}
+
+TestSuite(ShuntingTests);
+
+Test(ShuntingTests, shunt_simplest)
+{
+    char *rpn;
+    const char *expr = "1 + 1";
+    int actual = shunting_yard(expr, &rpn);
+    cr_expect(actual == 0, "Expected shunting_yard return value %d, got %d", 0, actual);
+    cr_expect(strcmp(rpn, "1 1 +") == 0, "Expected '1 1 +', got %s", rpn);
+    free(rpn);
+}
+
+Test(ShuntingTests, shunt_nico)
+{
+    char *rpn;
+    const char *expr = "1 + 1 + 1";
+    int actual = shunting_yard(expr, &rpn);
+    cr_expect(actual == 0, "Expected shunting_yard return value %d, got %d", 0, actual);
+    cr_expect(strcmp(rpn, "1 1 + 1 +") == 0, "Expected '1 1 + 1 +', got %s", rpn);
+    free(rpn);
+}
+
+Test(ShuntingTests, shunt_harderdaddy)
+{
+    char *rpn;
+    const char *expr = "5*(2^2+3)";
+    int actual = shunting_yard(expr, &rpn);
+    cr_expect(actual == 0, "Expected shunting_yard return value %d, got %d", 0, actual);
+    cr_expect(strcmp(rpn, "5 2 2 ^ 3 + *") == 0, "Expected '5 2 2 ^ 3 + *', got %s", rpn);
+    free(rpn);
+}
+
+Test(ShuntingTests, shunt_numbers)
+{
+    char *rpn;
+    const char *expr = "42 + 50";
+    int actual = shunting_yard(expr, &rpn);
+    cr_expect(actual == 0, "Expected shunting_yard return value %d, got %d", 0, actual);
+    cr_expect(strcmp(rpn, "42 50 +") == 0, "Expected '42 50 +', got %s", rpn);
+    free(rpn);
+}
+
+Test(ShuntingTests, shunt_mod)
+{
+    char *rpn;
+    const char *expr = "42 % 50";
+    int actual = shunting_yard(expr, &rpn);
+    cr_expect(actual == 0, "Expected shunting_yard return value %d, got %d", 0, actual);
+    cr_expect(strcmp(rpn, "42 50 %") == 0, "Expected '42 50 +', got %s", rpn);
+    free(rpn);
+}
diff --git a/graphs/piscine/fact/fact.c b/graphs/piscine/fact/fact.c
new file mode 100644
index 0000000..1440c94
--- /dev/null
+++ b/graphs/piscine/fact/fact.c
@@ -0,0 +1,8 @@
+unsigned long fact(unsigned n)
+{
+    if (n == 0)
+    {
+        return 1;
+    }
+    return n * fact(n - 1);
+}
diff --git a/graphs/piscine/facto/facto.sh b/graphs/piscine/facto/facto.sh
new file mode 100755
index 0000000..350973a
--- /dev/null
+++ b/graphs/piscine/facto/facto.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+[ $# -ne 1 ] && exit 1
+i=$1
+res=1
+while [ "$i" -gt 0 ]; do
+    res=$(($res * $i))
+    i=$(($i - 1))
+done
+echo "$res"
diff --git a/graphs/piscine/fibo/fibo.c b/graphs/piscine/fibo/fibo.c
new file mode 100644
index 0000000..99c0d79
--- /dev/null
+++ b/graphs/piscine/fibo/fibo.c
@@ -0,0 +1,8 @@
+unsigned long fibonacci(unsigned long n)
+{
+    if (n == 0 || n == 1)
+    {
+        return n;
+    }
+    return fibonacci(n - 1) + fibonacci(n - 2);
+}
diff --git a/graphs/piscine/fibo_iter/fibo_iter.c b/graphs/piscine/fibo_iter/fibo_iter.c
new file mode 100644
index 0000000..36ebf46
--- /dev/null
+++ b/graphs/piscine/fibo_iter/fibo_iter.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+unsigned long fibo_iter(unsigned long n)
+{
+    if (n == 0)
+    {
+        return 0;
+    }
+    unsigned long prev = 1;
+    unsigned long pprev = 0;
+    unsigned long i;
+
+    for (i = 1; i < n; i++)
+    {
+        unsigned long next = pprev + prev;
+        pprev = prev;
+        prev = next;
+    }
+
+    return prev;
+}
diff --git a/graphs/piscine/fifo/Makefile b/graphs/piscine/fifo/Makefile
new file mode 100644
index 0000000..e5c9374
--- /dev/null
+++ b/graphs/piscine/fifo/Makefile
@@ -0,0 +1,16 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -Wextra -Wvla -Werror -pedantic
+
+.PHONY: library clean
+
+library: fifo_access.o fifo_setup_destroy.o
+	ar csr libfifo.a $^
+
+fifo_access.o: fifo_access.c
+	$(CC) $(CFLAGS) -c -o fifo_access.o fifo_access.c
+
+fifo_setup_destroy.o: fifo_setup_destroy.c
+	$(CC) $(CFLAGS) -c -o fifo_setup_destroy.o fifo_setup_destroy.c
+
+clean:
+	rm *.o libfifo.a
diff --git a/graphs/piscine/fifo/fifo.h b/graphs/piscine/fifo/fifo.h
new file mode 100644
index 0000000..c4b0a6f
--- /dev/null
+++ b/graphs/piscine/fifo/fifo.h
@@ -0,0 +1,28 @@
+#ifndef FIFO_H
+#define FIFO_H
+
+#include <stddef.h>
+
+struct list
+{
+    int data;
+    struct list *next;
+};
+
+struct fifo
+{
+    struct list *head;
+    struct list *tail;
+    size_t size;
+};
+
+struct fifo *fifo_init(void);
+size_t fifo_size(struct fifo *fifo);
+void fifo_push(struct fifo *fifo, int elt);
+int fifo_head(struct fifo *fifo);
+void fifo_pop(struct fifo *fifo);
+void fifo_clear(struct fifo *fifo);
+void fifo_destroy(struct fifo *fifo);
+void fifo_print(const struct fifo *fifo);
+
+#endif /* !FIFO_H */
diff --git a/graphs/piscine/fifo/fifo_access.c b/graphs/piscine/fifo/fifo_access.c
new file mode 100644
index 0000000..5d31586
--- /dev/null
+++ b/graphs/piscine/fifo/fifo_access.c
@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "fifo.h"
+
+size_t fifo_size(struct fifo *fifo)
+{
+    return fifo->size;
+}
+
+void fifo_push(struct fifo *fifo, int elt)
+{
+    struct list *new = malloc(sizeof(struct list));
+    if (new == NULL)
+    {
+        return;
+    }
+    new->data = elt;
+
+    if (fifo_size(fifo) == 0)
+    {
+        fifo->head = new;
+    }
+    new->next = NULL;
+    if (fifo_size(fifo) != 0)
+    {
+        fifo->tail->next = new;
+    }
+    fifo->tail = new;
+
+    fifo->size++;
+}
+
+int fifo_head(struct fifo *fifo)
+{
+    return fifo->head->data;
+}
+
+void fifo_pop(struct fifo *fifo)
+{
+    if (fifo_size(fifo) == 0)
+    {
+        return;
+    }
+    if (fifo_size(fifo) == 1)
+    {
+        free(fifo->head);
+        fifo->head = NULL;
+        fifo->tail = NULL;
+        return;
+    }
+
+    struct list *tmp = fifo->head->next;
+    free(fifo->head);
+    fifo->head = tmp;
+
+    fifo->size--;
+}
+
+void fifo_print(const struct fifo *fifo)
+{
+    for (struct list *l = fifo->head; l; l = l->next)
+    {
+        printf("%d\n", l->data);
+    }
+}
diff --git a/graphs/piscine/fifo/fifo_setup_destroy.c b/graphs/piscine/fifo/fifo_setup_destroy.c
new file mode 100644
index 0000000..80820e1
--- /dev/null
+++ b/graphs/piscine/fifo/fifo_setup_destroy.c
@@ -0,0 +1,39 @@
+#include <stdlib.h>
+
+#include "fifo.h"
+
+struct fifo *fifo_init(void)
+{
+    struct fifo *f = malloc(sizeof(struct fifo));
+    if (f == NULL)
+    {
+        return NULL;
+    }
+
+    f->size = 0;
+    f->head = NULL;
+    f->tail = NULL;
+
+    return f;
+}
+
+void fifo_clear(struct fifo *fifo)
+{
+    for (struct list *l = fifo->head; l != fifo->tail;)
+    {
+        struct list *tmp = l->next;
+        free(l);
+        l = tmp;
+    }
+    free(fifo->tail);
+
+    fifo->head = NULL;
+    fifo->tail = NULL;
+    fifo->size = 0;
+}
+
+void fifo_destroy(struct fifo *fifo)
+{
+    fifo_clear(fifo);
+    free(fifo);
+}
diff --git a/graphs/piscine/find_ascii/find_ascii.sh b/graphs/piscine/find_ascii/find_ascii.sh
new file mode 100755
index 0000000..db31722
--- /dev/null
+++ b/graphs/piscine/find_ascii/find_ascii.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+for filename in $(ls "$1"); do
+    echo $1/$filename | file -f - | grep ASCII
+done
diff --git a/graphs/piscine/freq_analysis/freq_analysis.c b/graphs/piscine/freq_analysis/freq_analysis.c
new file mode 100644
index 0000000..c60d7a6
--- /dev/null
+++ b/graphs/piscine/freq_analysis/freq_analysis.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+
+int find_rank(int h[26], int min)
+{
+    int res = 0;
+    for (int i = 0; i < 26; i++)
+    {
+        res += h[i] > h[min] || (h[i] == h[min] && i < min);
+    }
+    return res;
+}
+
+void freq_analysis(const char text[], const char table[])
+{
+    int h[26] = { 0 };
+    for (int i = 0; text[i]; i++)
+    {
+        h[text[i] - 'A']++;
+    }
+
+    for (int j = 0; j < 26; j++)
+    {
+        if (h[j] != 0)
+        {
+            printf("%c %c\n", j + 'A', table[find_rank(h, j)]);
+        }
+    }
+}
diff --git a/graphs/piscine/functional_programming/foldl.c b/graphs/piscine/functional_programming/foldl.c
new file mode 100644
index 0000000..ac222a7
--- /dev/null
+++ b/graphs/piscine/functional_programming/foldl.c
@@ -0,0 +1,11 @@
+#include "functional_programming.h"
+
+int foldl(int *array, size_t len, int (*func)(int, int))
+{
+    int acc = 0;
+    for (size_t i = 0; i < len; i++)
+    {
+        acc = (*func)(acc, array[i]);
+    }
+    return acc;
+}
diff --git a/graphs/piscine/functional_programming/foldr.c b/graphs/piscine/functional_programming/foldr.c
new file mode 100644
index 0000000..c232410
--- /dev/null
+++ b/graphs/piscine/functional_programming/foldr.c
@@ -0,0 +1,10 @@
+#include "functional_programming.h"
+
+int foldr(int *array, size_t len, int (*func)(int, int))
+{
+    if (len == 1)
+    {
+        return (*func)(array[0], 0);
+    }
+    return (*func)(array[0], foldr(array + 1, len - 1, func));
+}
diff --git a/graphs/piscine/functional_programming/functional_programming.h b/graphs/piscine/functional_programming/functional_programming.h
new file mode 100644
index 0000000..429b13c
--- /dev/null
+++ b/graphs/piscine/functional_programming/functional_programming.h
@@ -0,0 +1,10 @@
+#ifndef FUNCTIONAL_PROGRAMMING_H
+#define FUNCTIONAL_PROGRAMMING_H
+
+#include <stddef.h>
+
+void map(int *array, size_t len, void (*func)(int *));
+int foldr(int *array, size_t len, int (*func)(int, int));
+int foldl(int *array, size_t len, int (*func)(int, int));
+
+#endif /* !FUNCTIONAL_PROGRAMMING_H */
diff --git a/graphs/piscine/functional_programming/map.c b/graphs/piscine/functional_programming/map.c
new file mode 100644
index 0000000..311c39c
--- /dev/null
+++ b/graphs/piscine/functional_programming/map.c
@@ -0,0 +1,9 @@
+#include "functional_programming.h"
+
+void map(int *array, size_t len, void (*func)(int *))
+{
+    for (size_t i = 0; i < len; i++)
+    {
+        (*func)(array + i);
+    }
+}
diff --git a/graphs/piscine/generate_files/generate_files.sh b/graphs/piscine/generate_files/generate_files.sh
new file mode 100755
index 0000000..cf2ba0a
--- /dev/null
+++ b/graphs/piscine/generate_files/generate_files.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+FILENAME="default"
+NUMBER="1"
+EXTENSION="txt"
+
+while [ $# -gt 0 ]; do
+	case "$1" in
+		'-f' | '--filename')
+			shift
+			FILENAME="$1"
+			shift
+			;;
+		'-n' | '--number')
+			shift
+			NUMBER="$1"
+			shift
+			;;
+		'-e' | '--extension')
+			shift
+			EXTENSION="$1"
+			shift
+			;;
+		*)
+			exit 1
+			;;
+	esac
+done
+
+for i in $(seq 1 $NUMBER); do
+	touch -- "$FILENAME-$i.$EXTENSION"
+done
diff --git a/graphs/piscine/generic_void_list/list.c b/graphs/piscine/generic_void_list/list.c
new file mode 100644
index 0000000..20ecfa8
--- /dev/null
+++ b/graphs/piscine/generic_void_list/list.c
@@ -0,0 +1,36 @@
+#include "list.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct list *list_prepend(struct list *list, const void *value,
+                          size_t data_size)
+{
+    struct list *new = malloc(sizeof(struct list));
+    new->next = list;
+    new->data = malloc(sizeof(void *));
+    memcpy(new->data, value, data_size);
+    return new;
+}
+
+size_t list_length(struct list *list)
+{
+    size_t res = 0;
+    while (list)
+    {
+        res++;
+        list = list->next;
+    }
+    return res;
+}
+
+void list_destroy(struct list *list)
+{
+    while (list)
+    {
+        struct list *tmp = list->next;
+        free(list->data);
+        free(list);
+        list = tmp;
+    }
+}
diff --git a/graphs/piscine/generic_void_list/list.h b/graphs/piscine/generic_void_list/list.h
new file mode 100644
index 0000000..a1bc035
--- /dev/null
+++ b/graphs/piscine/generic_void_list/list.h
@@ -0,0 +1,31 @@
+#ifndef LIST_H
+#define LIST_H
+
+#include <stddef.h>
+
+struct list
+{
+    void *data;
+    struct list *next;
+};
+
+/*
+** Insert a node containing `value` at the beginning of the list.
+** Return `NULL` if an error occurred.
+*/
+struct list *list_prepend(struct list *list, const void *value,
+                          size_t data_size);
+
+/*
+** Return the length of the list.
+** Return `0` if the list is empty.
+*/
+size_t list_length(struct list *list);
+
+/*
+** Release the memory used by the list.
+** Does nothing if `list` is `NULL`.
+*/
+void list_destroy(struct list *list);
+
+#endif /* !LIST_H */
diff --git a/graphs/piscine/glob_easy/glob_easy.sh b/graphs/piscine/glob_easy/glob_easy.sh
new file mode 100755
index 0000000..b6ae028
--- /dev/null
+++ b/graphs/piscine/glob_easy/glob_easy.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo $1/*.[A-Za-z][A-Za-z]
diff --git a/graphs/piscine/glob_remove_shell/glob_remove_shell.sh b/graphs/piscine/glob_remove_shell/glob_remove_shell.sh
new file mode 100755
index 0000000..c2e7ff7
--- /dev/null
+++ b/graphs/piscine/glob_remove_shell/glob_remove_shell.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+fmt=*.${1:-"txt"}
+
+for file in $(echo "$fmt"); do
+	[ -e "$file" ] && rm "$file" || exit 1
+done
diff --git a/graphs/piscine/grade/grade.c b/graphs/piscine/grade/grade.c
new file mode 100644
index 0000000..caecc82
--- /dev/null
+++ b/graphs/piscine/grade/grade.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+void grade(char g)
+{
+    switch (g)
+    {
+    case 'A':
+        puts("Excellent");
+        break;
+    case 'B':
+        puts("Good");
+        break;
+    case 'C':
+        puts("Not so bad");
+        break;
+    case 'D':
+        puts("Could be worse");
+        break;
+    case 'E':
+        puts("Maybe next time");
+        break;
+    case 'F':
+        puts("No comment");
+        break;
+    default:
+        puts("Call a wild ACU");
+        break;
+    }
+}
diff --git a/graphs/piscine/greatest_divisor/greatest_divisor.c b/graphs/piscine/greatest_divisor/greatest_divisor.c
new file mode 100644
index 0000000..4c8efef
--- /dev/null
+++ b/graphs/piscine/greatest_divisor/greatest_divisor.c
@@ -0,0 +1,15 @@
+unsigned int greatest_divisor(unsigned int n)
+{
+    if (n == 0 || n == 1)
+    {
+        return 1;
+    }
+
+    int i;
+    for (i = n / 2; i > 0 && n % i; i--)
+    {
+        continue;
+    }
+
+    return i;
+}
diff --git a/graphs/piscine/hacker_news/input.html b/graphs/piscine/hacker_news/input.html
new file mode 100644
index 0000000..54d338d
--- /dev/null
+++ b/graphs/piscine/hacker_news/input.html
@@ -0,0 +1,147 @@
+<html op="news" class=" lddwcbt idc0_332" lang="en"><head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8"><meta name="referrer" content="origin"><meta name="viewport" content="width=device-width, initial-scale=1.0"><link rel="stylesheet" type="text/css" href="02_files/news.css">
+        <link rel="shortcut icon" href="https://news.ycombinator.com/favicon.ico">
+          <link rel="alternate" type="application/rss+xml" title="RSS" href="https://news.ycombinator.com/rss">
+        <title>Hacker News</title></head><body><center><table id="hnmain" width="85%" cellspacing="0" cellpadding="0" border="0" bgcolor="#f6f6ef">
+        <tbody><tr><td bgcolor="#ff6600"><table style="padding:2px" width="100%" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td style="width:18px;padding-right:4px"><a href="https://news.ycombinator.com/"><img src="02_files/y18.gif" style="border:1px white solid;" width="18" height="18"></a></td>
+                  <td style="line-height:12pt; height:10px;"><span class="pagetop"><b class="hnname"><a href="https://news.ycombinator.com/news">Hacker News</a></b>
+              <a href="https://news.ycombinator.com/newest">new</a> | <a href="https://news.ycombinator.com/front">past</a> | <a href="https://news.ycombinator.com/newcomments">comments</a> | <a href="https://news.ycombinator.com/ask">ask</a> | <a href="https://news.ycombinator.com/show">show</a> | <a href="https://news.ycombinator.com/jobs">jobs</a> | <a href="https://news.ycombinator.com/submit">submit</a>            </span></td><td style="text-align:right;padding-right:4px;"><span class="pagetop">
+                              <a href="https://news.ycombinator.com/login?goto=news%3Fp%3D2">login</a>
+                          </span></td>
+              </tr></tbody></table></td></tr>
+<tr id="pagespace" title="" style="height:10px"></tr><tr><td><table class="itemlist" cellspacing="0" cellpadding="0" border="0">
+              <tbody><tr class="athing" id="28943869">
+      <td class="title" valign="top" align="right"><span class="rank">31.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28943869" href="https://news.ycombinator.com/vote?id=28943869&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://apnews.com/article/technology-business-arts-and-entertainment-be48d7582fdd5604664fff33ed81ca80" class="titlelink">Sinclair Broadcast Group identifies data breach</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=apnews.com"><span class="sitestr">apnews.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28943869">8 points</span> by <a href="https://news.ycombinator.com/user?id=xojoc" class="hnuser">xojoc</a> <span class="age" title="2021-10-21T13:12:05"><a href="https://news.ycombinator.com/item?id=28943869">1 hour ago</a></span> <span id="unv_28943869"></span> | <a href="https://news.ycombinator.com/hide?id=28943869&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28943869">1&nbsp;comment</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28926775">
+      <td class="title" valign="top" align="right"><span class="rank">32.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28926775" href="https://news.ycombinator.com/vote?id=28926775&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.earlevel.com/main/2002/08/31/a-gentle-introduction-to-the-fft/" class="titlelink">A gentle introduction to the FFT (2002)</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=earlevel.com"><span class="sitestr">earlevel.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28926775">71 points</span> by <a href="https://news.ycombinator.com/user?id=tigerlily" class="hnuser">tigerlily</a> <span class="age" title="2021-10-20T04:31:20"><a href="https://news.ycombinator.com/item?id=28926775">12 hours ago</a></span> <span id="unv_28926775"></span> | <a href="https://news.ycombinator.com/hide?id=28926775&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28926775">14&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28930157">
+      <td class="title" valign="top" align="right"><span class="rank">33.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28930157" href="https://news.ycombinator.com/vote?id=28930157&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://thebrowser.com/notes/jon-ingold/" class="titlelink">Jon Ingold on translating archeology into video games</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=thebrowser.com"><span class="sitestr">thebrowser.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28930157">36 points</span> by <a href="https://news.ycombinator.com/user?id=nupitalnumber" class="hnuser">nupitalnumber</a> <span class="age" title="2021-10-20T13:04:53"><a href="https://news.ycombinator.com/item?id=28930157">9 hours ago</a></span> <span id="unv_28930157"></span> | <a href="https://news.ycombinator.com/hide?id=28930157&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28930157">4&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28943611">
+      <td class="title" valign="top" align="right"><span class="rank">34.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28943611" href="https://news.ycombinator.com/vote?id=28943611&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://news.ycombinator.com/item?id=28943611" class="titlelink">Ask HN: How to Sell a Website</a></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28943611">7 points</span> by <a href="https://news.ycombinator.com/user?id=legrisch" class="hnuser">legrisch</a> <span class="age" title="2021-10-21T12:45:35"><a href="https://news.ycombinator.com/item?id=28943611">1 hour ago</a></span> <span id="unv_28943611"></span> | <a href="https://news.ycombinator.com/hide?id=28943611&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28943611">3&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28933391">
+      <td class="title" valign="top" align="right"><span class="rank">35.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28933391" href="https://news.ycombinator.com/vote?id=28933391&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://iconmap.io/blog" class="titlelink">We analyzed 425k favicons</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=iconmap.io"><span class="sitestr">iconmap.io</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28933391">493 points</span> by <a href="https://news.ycombinator.com/user?id=gurgeous" class="hnuser">gurgeous</a> <span class="age" title="2021-10-20T17:29:03"><a href="https://news.ycombinator.com/item?id=28933391">20 hours ago</a></span> <span id="unv_28933391"></span> | <a href="https://news.ycombinator.com/hide?id=28933391&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28933391">119&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28938551">
+      <td class="title" valign="top" align="right"><span class="rank">36.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28938551" href="https://news.ycombinator.com/vote?id=28938551&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.science.org/content/article/machu-picchu-was-built-over-major-fault-zones-now-researchers-think-they-know-why" class="titlelink">Machu Picchu was built over major fault zones (2019)</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=science.org"><span class="sitestr">science.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28938551">98 points</span> by <a href="https://news.ycombinator.com/user?id=Anon84" class="hnuser">Anon84</a> <span class="age" title="2021-10-21T00:07:54"><a href="https://news.ycombinator.com/item?id=28938551">14 hours ago</a></span> <span id="unv_28938551"></span> | <a href="https://news.ycombinator.com/hide?id=28938551&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28938551">41&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28940507">
+      <td class="title" valign="top" align="right"><span class="rank">37.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28940507" href="https://news.ycombinator.com/vote?id=28940507&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://brave.com/wp-content/uploads/2021/03/goggles.pdf" class="titlelink">Goggles: Democracy dies in darkness, and so does the Web [pdf]</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=brave.com"><span class="sitestr">brave.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28940507">114 points</span> by <a href="https://news.ycombinator.com/user?id=InvaderFizz" class="hnuser">InvaderFizz</a> <span class="age" title="2021-10-21T05:03:56"><a href="https://news.ycombinator.com/item?id=28940507">9 hours ago</a></span> <span id="unv_28940507"></span> | <a href="https://news.ycombinator.com/hide?id=28940507&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28940507">119&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28933663">
+      <td class="title" valign="top" align="right"><span class="rank">38.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28933663" href="https://news.ycombinator.com/vote?id=28933663&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://browser.geekbench.com/v5/cpu/10496766" class="titlelink">Apple M1 Max Geekbench Score</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=geekbench.com"><span class="sitestr">geekbench.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28933663">467 points</span> by <a href="https://news.ycombinator.com/user?id=mv9" class="hnuser">mv9</a> <span class="age" title="2021-10-20T17:50:17"><a href="https://news.ycombinator.com/item?id=28933663">20 hours ago</a></span> <span id="unv_28933663"></span> | <a href="https://news.ycombinator.com/hide?id=28933663&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28933663">771&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28933981">
+      <td class="title" valign="top" align="right"><span class="rank">39.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28933981" href="https://news.ycombinator.com/vote?id=28933981&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.commerce.gov/news/press-releases/2021/10/commerce-tightens-export-controls-items-used-surveillance-private" class="titlelink">U.S. tightens export controls on items used in surveillance of private citizens</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=commerce.gov"><span class="sitestr">commerce.gov</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28933981">275 points</span> by <a href="https://news.ycombinator.com/user?id=transpute" class="hnuser">transpute</a> <span class="age" title="2021-10-20T18:14:33"><a href="https://news.ycombinator.com/item?id=28933981">20 hours ago</a></span> <span id="unv_28933981"></span> | <a href="https://news.ycombinator.com/hide?id=28933981&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28933981">161&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28943645">
+      <td class="title" valign="top" align="right"><span class="rank">40.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28943645" href="https://news.ycombinator.com/vote?id=28943645&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.wsj.com/articles/wework-set-to-go-public-via-spac-deal-two-years-after-failed-ipo-11634808600" class="titlelink" rel="nofollow">WeWork is trying to go public – again</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=wsj.com"><span class="sitestr">wsj.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28943645">8 points</span> by <a href="https://news.ycombinator.com/user?id=collegeburner" class="hnuser">collegeburner</a> <span class="age" title="2021-10-21T12:49:02"><a href="https://news.ycombinator.com/item?id=28943645">1 hour ago</a></span> <span id="unv_28943645"></span> | <a href="https://news.ycombinator.com/hide?id=28943645&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28943645">2&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28934624">
+      <td class="title" valign="top" align="right"><span class="rank">41.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28934624" href="https://news.ycombinator.com/vote?id=28934624&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.copetti.org/writings/consoles/playstation-3/" class="titlelink">Playstation 3 Architecture</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=copetti.org"><span class="sitestr">copetti.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28934624">362 points</span> by <a href="https://news.ycombinator.com/user?id=bangonkeyboard" class="hnuser">bangonkeyboard</a> <span class="age" title="2021-10-20T18:56:53"><a href="https://news.ycombinator.com/item?id=28934624">19 hours ago</a></span> <span id="unv_28934624"></span> | <a href="https://news.ycombinator.com/hide?id=28934624&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28934624">81&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28929639">
+      <td class="title" valign="top" align="right"><span class="rank">42.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28929639" href="https://news.ycombinator.com/vote?id=28929639&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://owlpal.substack.com/p/about-that-time-i-had-an-outburst" class="titlelink">About that time I had an outburst during the Y Combinator Interview</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=owlpal.substack.com"><span class="sitestr">owlpal.substack.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28929639">498 points</span> by <a href="https://news.ycombinator.com/user?id=curiousowl" class="hnuser">curiousowl</a> <span class="age" title="2021-10-20T12:03:25"><a href="https://news.ycombinator.com/item?id=28929639">1 day ago</a></span> <span id="unv_28929639"></span> | <a href="https://news.ycombinator.com/hide?id=28929639&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28929639">242&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28938378">
+      <td class="title" valign="top" align="right"><span class="rank">43.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28938378" href="https://news.ycombinator.com/vote?id=28938378&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.guernicamag.com/one-mans-pest/" class="titlelink" rel="nofollow">One Man's Pest</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=guernicamag.com"><span class="sitestr">guernicamag.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28938378">8 points</span> by <a href="https://news.ycombinator.com/user?id=yimby" class="hnuser">yimby</a> <span class="age" title="2021-10-20T23:47:13"><a href="https://news.ycombinator.com/item?id=28938378">6 hours ago</a></span> <span id="unv_28938378"></span> | <a href="https://news.ycombinator.com/hide?id=28938378&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28938378">discuss</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28926582">
+      <td class="title" valign="top" align="right"><span class="rank">44.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28926582" href="https://news.ycombinator.com/vote?id=28926582&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://brave.com/search-and-web-discovery/" class="titlelink">Brave Search replaces Google as default search engine in the Brave browser</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=brave.com"><span class="sitestr">brave.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28926582">723 points</span> by <a href="https://news.ycombinator.com/user?id=skellertor" class="hnuser">skellertor</a> <span class="age" title="2021-10-20T03:56:51"><a href="https://news.ycombinator.com/item?id=28926582">1 day ago</a></span> <span id="unv_28926582"></span> | <a href="https://news.ycombinator.com/hide?id=28926582&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28926582">528&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28943866">
+      <td class="title" valign="top" align="right"><span class="rank">45.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28943866" href="https://news.ycombinator.com/vote?id=28943866&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://twitter.com//rashiq/status/1319346264992026624" class="titlelink" rel="nofollow">I reverse engineered mcdonald's internal API</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=twitter.com/rashiq"><span class="sitestr">twitter.com/rashiq</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28943866">3 points</span> by <a href="https://news.ycombinator.com/user?id=graderjs" class="hnuser">graderjs</a> <span class="age" title="2021-10-21T13:11:46"><a href="https://news.ycombinator.com/item?id=28943866">1 hour ago</a></span> <span id="unv_28943866"></span> | <a href="https://news.ycombinator.com/hide?id=28943866&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28943866">discuss</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28936324">
+      <td class="title" valign="top" align="right"><span class="rank">46.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28936324" href="https://news.ycombinator.com/vote?id=28936324&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.science.org/doi/10.1126/scisignal.abc4764" class="titlelink">Injury response to DNA damage in live tumor cells promotes antitumor immunity</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=science.org"><span class="sitestr">science.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28936324">109 points</span> by <a href="https://news.ycombinator.com/user?id=bcaulfield" class="hnuser">bcaulfield</a> <span class="age" title="2021-10-20T20:48:40"><a href="https://news.ycombinator.com/item?id=28936324">17 hours ago</a></span> <span id="unv_28936324"></span> | <a href="https://news.ycombinator.com/hide?id=28936324&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28936324">5&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28940197">
+      <td class="title" valign="top" align="right"><span class="rank">47.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28940197" href="https://news.ycombinator.com/vote?id=28940197&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.cowin.gov.in/" class="titlelink">India Counting Down to 1B Doses</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=cowin.gov.in"><span class="sitestr">cowin.gov.in</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28940197">105 points</span> by <a href="https://news.ycombinator.com/user?id=neelkadia" class="hnuser">neelkadia</a> <span class="age" title="2021-10-21T04:17:41"><a href="https://news.ycombinator.com/item?id=28940197">10 hours ago</a></span> <span id="unv_28940197"></span> | <a href="https://news.ycombinator.com/hide?id=28940197&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28940197">78&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28943066">
+      <td class="title" valign="top" align="right"><span class="rank">48.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28943066" href="https://news.ycombinator.com/vote?id=28943066&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://slate.com/technology/2021/10/tether-crypto-danger-ben-mckenzie.html" class="titlelink" rel="nofollow">Time to get worried about Tether, the “stablecoin” at center of cryptocurrency</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=slate.com"><span class="sitestr">slate.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28943066">6 points</span> by <a href="https://news.ycombinator.com/user?id=RickJWagner" class="hnuser">RickJWagner</a> <span class="age" title="2021-10-21T11:45:09"><a href="https://news.ycombinator.com/item?id=28943066">2 hours ago</a></span> <span id="unv_28943066"></span> | <a href="https://news.ycombinator.com/hide?id=28943066&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28943066">5&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28940258">
+      <td class="title" valign="top" align="right"><span class="rank">49.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28940258" href="https://news.ycombinator.com/vote?id=28940258&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.alifewithoutlimits.com.au/the-history-of-surveying/" class="titlelink">The History of Surveying</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=alifewithoutlimits.com.au"><span class="sitestr">alifewithoutlimits.com.au</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28940258">20 points</span> by <a href="https://news.ycombinator.com/user?id=barbazoo" class="hnuser">barbazoo</a> <span class="age" title="2021-10-21T04:27:11"><a href="https://news.ycombinator.com/item?id=28940258">9 hours ago</a></span> <span id="unv_28940258"></span> | <a href="https://news.ycombinator.com/hide?id=28940258&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28940258">9&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28921244">
+      <td class="title" valign="top" align="right"><span class="rank">50.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28921244" href="https://news.ycombinator.com/vote?id=28921244&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.npr.org/2021/10/19/1047303559/fda-hearing-aid-prescription-over-the-counter" class="titlelink">The FDA wants you to be able to buy a hearing aid without a prescription</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=npr.org"><span class="sitestr">npr.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28921244">722 points</span> by <a href="https://news.ycombinator.com/user?id=cf100clunk" class="hnuser">cf100clunk</a> <span class="age" title="2021-10-19T17:58:42"><a href="https://news.ycombinator.com/item?id=28921244">1 day ago</a></span> <span id="unv_28921244"></span> | <a href="https://news.ycombinator.com/hide?id=28921244&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28921244">441&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28942594">
+      <td class="title" valign="top" align="right"><span class="rank">51.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28942594" href="https://news.ycombinator.com/vote?id=28942594&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.pcgamer.com/windows-11-pcs-can-hobble-gaming-performance/" class="titlelink">Windows 11 will hobble gaming performance by default on some prebuilt PCs</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=pcgamer.com"><span class="sitestr">pcgamer.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28942594">13 points</span> by <a href="https://news.ycombinator.com/user?id=DeathArrow" class="hnuser">DeathArrow</a> <span class="age" title="2021-10-21T10:33:39"><a href="https://news.ycombinator.com/item?id=28942594">3 hours ago</a></span> <span id="unv_28942594"></span> | <a href="https://news.ycombinator.com/hide?id=28942594&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28942594">3&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28940705">
+      <td class="title" valign="top" align="right"><span class="rank">52.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28940705" href="https://news.ycombinator.com/vote?id=28940705&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.gimp.org/news/2021/10/20/gimp-2-99-8-released/" class="titlelink">Development version: GIMP 2.99.8 Released</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=gimp.org"><span class="sitestr">gimp.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28940705">19 points</span> by <a href="https://news.ycombinator.com/user?id=pauloxnet" class="hnuser">pauloxnet</a> <span class="age" title="2021-10-21T05:33:20"><a href="https://news.ycombinator.com/item?id=28940705">8 hours ago</a></span> <span id="unv_28940705"></span> | <a href="https://news.ycombinator.com/hide?id=28940705&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28940705">2&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28903383">
+      <td class="title" valign="top" align="right"><span class="rank">53.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28903383" href="https://news.ycombinator.com/vote?id=28903383&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://mikolaj-kaminski.com/jetbrains-rider-docker-compose-unicodedecodeerror-issue-fix/" class="titlelink">I couldn't debug the code because of my name</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=mikolaj-kaminski.com"><span class="sitestr">mikolaj-kaminski.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28903383">247 points</span> by <a href="https://news.ycombinator.com/user?id=mikasjp" class="hnuser">mikasjp</a> <span class="age" title="2021-10-18T08:40:39"><a href="https://news.ycombinator.com/item?id=28903383">23 hours ago</a></span> <span id="unv_28903383"></span> | <a href="https://news.ycombinator.com/hide?id=28903383&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28903383">268&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28937484">
+      <td class="title" valign="top" align="right"><span class="rank">54.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28937484" href="https://news.ycombinator.com/vote?id=28937484&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://calbryant.uk/blog/10-ways-to-get-the-best-out-of-openscad/" class="titlelink">Getting the best out of OpenSCAD</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=calbryant.uk"><span class="sitestr">calbryant.uk</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28937484">109 points</span> by <a href="https://news.ycombinator.com/user?id=naggie" class="hnuser">naggie</a> <span class="age" title="2021-10-20T22:13:20"><a href="https://news.ycombinator.com/item?id=28937484">16 hours ago</a></span> <span id="unv_28937484"></span> | <a href="https://news.ycombinator.com/hide?id=28937484&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28937484">52&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28921083">
+      <td class="title" valign="top" align="right"><span class="rank">55.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28921083" href="https://news.ycombinator.com/vote?id=28921083&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://spectrum.ieee.org/recycled-batteries-good-as-newly-mined" class="titlelink">Study: Recycled Lithium Batteries as Good as Newly Mined</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=ieee.org"><span class="sitestr">ieee.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28921083">623 points</span> by <a href="https://news.ycombinator.com/user?id=mpweiher" class="hnuser">mpweiher</a> <span class="age" title="2021-10-19T17:45:07"><a href="https://news.ycombinator.com/item?id=28921083">1 day ago</a></span> <span id="unv_28921083"></span> | <a href="https://news.ycombinator.com/hide?id=28921083&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28921083">179&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28934715">
+      <td class="title" valign="top" align="right"><span class="rank">56.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28934715" href="https://news.ycombinator.com/vote?id=28934715&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://americasfuture.org/eliminating-gifted-programs-wont-make-education-fair/" class="titlelink">Eliminating gifted programs won’t make education fair</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=americasfuture.org"><span class="sitestr">americasfuture.org</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28934715">180 points</span> by <a href="https://news.ycombinator.com/user?id=paulpauper" class="hnuser">paulpauper</a> <span class="age" title="2021-10-20T19:03:44"><a href="https://news.ycombinator.com/item?id=28934715">19 hours ago</a></span> <span id="unv_28934715"></span> | <a href="https://news.ycombinator.com/hide?id=28934715&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28934715">400&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28939407">
+      <td class="title" valign="top" align="right"><span class="rank">57.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28939407" href="https://news.ycombinator.com/vote?id=28939407&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://github.com/ToshioCP/Gtk4-tutorial/blob/main/Readme.md" class="titlelink">Gtk4 Tutorial</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=github.com/toshiocp"><span class="sitestr">github.com/toshiocp</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28939407">53 points</span> by <a href="https://news.ycombinator.com/user?id=marcodiego" class="hnuser">marcodiego</a> <span class="age" title="2021-10-21T01:59:18"><a href="https://news.ycombinator.com/item?id=28939407">12 hours ago</a></span> <span id="unv_28939407"></span> | <a href="https://news.ycombinator.com/hide?id=28939407&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28939407">73&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28940334">
+      <td class="title" valign="top" align="right"><span class="rank">58.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28940334" href="https://news.ycombinator.com/vote?id=28940334&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://obua.com/publications/cosmo-id/3/" class="titlelink" rel="nofollow">Cosmopolitan Identifiers</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=obua.com"><span class="sitestr">obua.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28940334">10 points</span> by <a href="https://news.ycombinator.com/user?id=BeefySwain" class="hnuser">BeefySwain</a> <span class="age" title="2021-10-21T04:39:41"><a href="https://news.ycombinator.com/item?id=28940334">9 hours ago</a></span> <span id="unv_28940334"></span> | <a href="https://news.ycombinator.com/hide?id=28940334&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28940334">2&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28929840">
+      <td class="title" valign="top" align="right"><span class="rank">59.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28929840" href="https://news.ycombinator.com/vote?id=28929840&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://madned.substack.com/p/a-talk-with-computer-gaming-pioneer" class="titlelink">A talk with Walter Bright about Empire</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=madned.substack.com"><span class="sitestr">madned.substack.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28929840">218 points</span> by <a href="https://news.ycombinator.com/user?id=mad_ned" class="hnuser">mad_ned</a> <span class="age" title="2021-10-20T12:29:16"><a href="https://news.ycombinator.com/item?id=28929840">1 day ago</a></span> <span id="unv_28929840"></span> | <a href="https://news.ycombinator.com/hide?id=28929840&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28929840">86&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+                <tr class="athing" id="28934833">
+      <td class="title" valign="top" align="right"><span class="rank">60.</span></td>      <td class="votelinks" valign="top"><center><a id="up_28934833" href="https://news.ycombinator.com/vote?id=28934833&amp;how=up&amp;goto=news%3Fp%3D2"><div class="votearrow" title="upvote"></div></a></center></td><td class="title"><a href="https://www.youtube.com/watch?v=NjrYk546uBA" class="titlelink">Bioelektryczność – Polish Robotics (1968) [video]</a><span class="sitebit comhead"> (<a href="https://news.ycombinator.com/from?site=youtube.com"><span class="sitestr">youtube.com</span></a>)</span></td></tr><tr><td colspan="2"></td><td class="subtext">
+        <span class="score" id="score_28934833">123 points</span> by <a href="https://news.ycombinator.com/user?id=danielEM" class="hnuser">danielEM</a> <span class="age" title="2021-10-20T19:11:59"><a href="https://news.ycombinator.com/item?id=28934833">19 hours ago</a></span> <span id="unv_28934833"></span> | <a href="https://news.ycombinator.com/hide?id=28934833&amp;goto=news%3Fp%3D2">hide</a> | <a href="https://news.ycombinator.com/item?id=28934833">27&nbsp;comments</a>              </td></tr>
+      <tr class="spacer" style="height:5px"></tr>
+            <tr class="morespace" style="height:10px"></tr><tr><td colspan="2"></td><td class="title"><a href="https://news.ycombinator.com/news?p=3" class="morelink" rel="next">More</a></td></tr>
+  </tbody></table>
+</td></tr>
+<tr><td><img src="02_files/s.gif" width="0" height="10"><table width="100%" cellspacing="0" cellpadding="1"><tbody><tr><td bgcolor="#ff6600"></td></tr></tbody></table><br><center><span class="yclinks"><a href="https://news.ycombinator.com/newsguidelines.html">Guidelines</a>
+        | <a href="https://news.ycombinator.com/newsfaq.html">FAQ</a>
+        | <a href="https://news.ycombinator.com/lists">Lists</a>
+        | <a href="https://github.com/HackerNews/API">API</a>
+        | <a href="https://news.ycombinator.com/security.html">Security</a>
+        | <a href="http://www.ycombinator.com/legal/">Legal</a>
+        | <a href="http://www.ycombinator.com/apply/">Apply to YC</a>
+        | <a href="mailto:hn@ycombinator.com">Contact</a></span><br><br><form method="get" action="//hn.algolia.com/">Search:
+          <input type="text" name="q" size="17" autocorrect="off" spellcheck="false" autocapitalize="none" autocomplete="false"></form>
+            </center></td></tr>
+      </tbody></table></center><script type="text/javascript" src="02_files/hn.js"></script>
+</body></html>
\ No newline at end of file
diff --git a/graphs/piscine/hacker_news/news.sed b/graphs/piscine/hacker_news/news.sed
new file mode 100644
index 0000000..91b76d6
--- /dev/null
+++ b/graphs/piscine/hacker_news/news.sed
@@ -0,0 +1 @@
+s/^.*"\(https\?:\/\/.*\)" class="titlelink"\( rel="nofollow"\)\?>\([^<]*\).*$/**\3**\n\1\n/p
diff --git a/graphs/piscine/hacker_news/output.txt b/graphs/piscine/hacker_news/output.txt
new file mode 100644
index 0000000..68cc714
--- /dev/null
+++ b/graphs/piscine/hacker_news/output.txt
@@ -0,0 +1,90 @@
+**Sinclair Broadcast Group identifies data breach**
+https://apnews.com/article/technology-business-arts-and-entertainment-be48d7582fdd5604664fff33ed81ca80
+
+**A gentle introduction to the FFT (2002)**
+https://www.earlevel.com/main/2002/08/31/a-gentle-introduction-to-the-fft/
+
+**Jon Ingold on translating archeology into video games**
+https://thebrowser.com/notes/jon-ingold/
+
+**Ask HN: How to Sell a Website**
+https://news.ycombinator.com/item?id=28943611
+
+**We analyzed 425k favicons**
+https://iconmap.io/blog
+
+**Machu Picchu was built over major fault zones (2019)**
+https://www.science.org/content/article/machu-picchu-was-built-over-major-fault-zones-now-researchers-think-they-know-why
+
+**Goggles: Democracy dies in darkness, and so does the Web [pdf]**
+https://brave.com/wp-content/uploads/2021/03/goggles.pdf
+
+**Apple M1 Max Geekbench Score**
+https://browser.geekbench.com/v5/cpu/10496766
+
+**U.S. tightens export controls on items used in surveillance of private citizens**
+https://www.commerce.gov/news/press-releases/2021/10/commerce-tightens-export-controls-items-used-surveillance-private
+
+**WeWork is trying to go public – again**
+https://www.wsj.com/articles/wework-set-to-go-public-via-spac-deal-two-years-after-failed-ipo-11634808600
+
+**Playstation 3 Architecture**
+https://www.copetti.org/writings/consoles/playstation-3/
+
+**About that time I had an outburst during the Y Combinator Interview**
+https://owlpal.substack.com/p/about-that-time-i-had-an-outburst
+
+**One Man's Pest**
+https://www.guernicamag.com/one-mans-pest/
+
+**Brave Search replaces Google as default search engine in the Brave browser**
+https://brave.com/search-and-web-discovery/
+
+**I reverse engineered mcdonald's internal API**
+https://twitter.com//rashiq/status/1319346264992026624
+
+**Injury response to DNA damage in live tumor cells promotes antitumor immunity**
+https://www.science.org/doi/10.1126/scisignal.abc4764
+
+**India Counting Down to 1B Doses**
+https://www.cowin.gov.in/
+
+**Time to get worried about Tether, the “stablecoin” at center of cryptocurrency**
+https://slate.com/technology/2021/10/tether-crypto-danger-ben-mckenzie.html
+
+**The History of Surveying**
+https://www.alifewithoutlimits.com.au/the-history-of-surveying/
+
+**The FDA wants you to be able to buy a hearing aid without a prescription**
+https://www.npr.org/2021/10/19/1047303559/fda-hearing-aid-prescription-over-the-counter
+
+**Windows 11 will hobble gaming performance by default on some prebuilt PCs**
+https://www.pcgamer.com/windows-11-pcs-can-hobble-gaming-performance/
+
+**Development version: GIMP 2.99.8 Released**
+https://www.gimp.org/news/2021/10/20/gimp-2-99-8-released/
+
+**I couldn't debug the code because of my name**
+https://mikolaj-kaminski.com/jetbrains-rider-docker-compose-unicodedecodeerror-issue-fix/
+
+**Getting the best out of OpenSCAD**
+https://calbryant.uk/blog/10-ways-to-get-the-best-out-of-openscad/
+
+**Study: Recycled Lithium Batteries as Good as Newly Mined**
+https://spectrum.ieee.org/recycled-batteries-good-as-newly-mined
+
+**Eliminating gifted programs won’t make education fair**
+https://americasfuture.org/eliminating-gifted-programs-wont-make-education-fair/
+
+**Gtk4 Tutorial**
+https://github.com/ToshioCP/Gtk4-tutorial/blob/main/Readme.md
+
+**Cosmopolitan Identifiers**
+https://obua.com/publications/cosmo-id/3/
+
+**A talk with Walter Bright about Empire**
+https://madned.substack.com/p/a-talk-with-computer-gaming-pioneer
+
+**Bioelektryczność – Polish Robotics (1968) [video]**
+https://www.youtube.com/watch?v=NjrYk546uBA
+
diff --git a/graphs/piscine/handling_complex/complex.c b/graphs/piscine/handling_complex/complex.c
new file mode 100644
index 0000000..79a10be
--- /dev/null
+++ b/graphs/piscine/handling_complex/complex.c
@@ -0,0 +1,51 @@
+#include "complex.h"
+
+#include <stdio.h>
+
+void print_complex(struct complex a)
+{
+    printf("complex(%.2f ", a.real);
+
+    if (a.img < 0)
+    {
+        printf("- %.2fi", -a.img);
+    }
+    else
+    {
+        printf("+ %.2fi", a.img);
+    }
+    printf(")\n");
+}
+
+struct complex neg_complex(struct complex a)
+{
+    struct complex z = { -a.real, -a.img };
+    return z;
+}
+
+struct complex add_complex(struct complex a, struct complex b)
+{
+    struct complex z = { a.real + b.real, a.img + b.img };
+    return z;
+}
+
+struct complex sub_complex(struct complex a, struct complex b)
+{
+    return add_complex(a, neg_complex(b));
+}
+
+struct complex mul_complex(struct complex a, struct complex b)
+{
+    struct complex z = { a.real * b.real - a.img * b.img,
+                         a.real * b.img + a.img * b.real };
+    return z;
+}
+
+struct complex div_complex(struct complex a, struct complex b)
+{
+    struct complex z = {
+        (a.real * b.real + a.img * b.img) / (b.real * b.real + b.img * b.img),
+        (a.img * b.real - a.real * b.img) / (b.real * b.real + b.img * b.img)
+    };
+    return z;
+}
diff --git a/graphs/piscine/handling_complex/complex.h b/graphs/piscine/handling_complex/complex.h
new file mode 100644
index 0000000..c562810
--- /dev/null
+++ b/graphs/piscine/handling_complex/complex.h
@@ -0,0 +1,20 @@
+#ifndef COMPLEX_H
+#define COMPLEX_H
+
+struct complex
+{
+    float real;
+    float img;
+};
+
+// Print
+void print_complex(struct complex a);
+
+// Operations
+struct complex neg_complex(struct complex a);
+struct complex add_complex(struct complex a, struct complex b);
+struct complex sub_complex(struct complex a, struct complex b);
+struct complex mul_complex(struct complex a, struct complex b);
+struct complex div_complex(struct complex a, struct complex b);
+
+#endif /* !COMPLEX_H */
diff --git a/graphs/piscine/hanoi/hanoi.c b/graphs/piscine/hanoi/hanoi.c
new file mode 100644
index 0000000..6ac2b71
--- /dev/null
+++ b/graphs/piscine/hanoi/hanoi.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+void move(unsigned src, unsigned spare, unsigned dst, unsigned n)
+{
+    if (n == 0)
+    {
+        return;
+    }
+
+    move(src, dst, spare, n - 1);
+
+    printf("%u->%u\n", src, dst);
+
+    move(spare, src, dst, n - 1);
+}
+
+void hanoi(unsigned n)
+{
+    if (n == 0)
+    {
+        return;
+    }
+
+    move(1, 2, 3, n);
+}
+
+int main(void)
+{
+    hanoi(3);
+    return 0;
+}
diff --git a/graphs/piscine/hash_map/hash.c b/graphs/piscine/hash_map/hash.c
new file mode 100644
index 0000000..434616f
--- /dev/null
+++ b/graphs/piscine/hash_map/hash.c
@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+size_t hash(const char *key)
+{
+    size_t i = 0;
+    size_t hash = 0;
+
+    for (i = 0; key[i] != '\0'; ++i)
+        hash += key[i];
+    hash += i;
+
+    return hash;
+}
diff --git a/graphs/piscine/hash_map/hash_map.c b/graphs/piscine/hash_map/hash_map.c
new file mode 100644
index 0000000..4690e8b
--- /dev/null
+++ b/graphs/piscine/hash_map/hash_map.c
@@ -0,0 +1,177 @@
+#include "hash_map.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct hash_map *hash_map_init(size_t size)
+{
+    struct hash_map *new;
+    if ((new = malloc(sizeof(struct hash_map))) == NULL)
+    {
+        return NULL;
+    }
+    if ((new->data = malloc(size * sizeof(struct pair_list *))) == NULL)
+    {
+        return NULL;
+    }
+    new->size = size;
+
+    for (size_t i = 0; i < size; i++)
+    {
+        new->data[i] = NULL;
+    }
+
+    return new;
+}
+
+bool hash_map_insert(struct hash_map *hash_map, const char *key, char *value,
+                     bool *updated)
+{
+    if (hash_map == NULL || updated == NULL || hash_map->size == 0)
+    {
+        return false;
+    }
+    *updated = false;
+
+    size_t h = hash(key);
+    if (h >= hash_map->size)
+    {
+        h %= hash_map->size;
+    }
+
+    struct pair_list *new = malloc(sizeof(struct pair_list));
+    if (new == NULL)
+    {
+        return false;
+    }
+
+    for (struct pair_list *p = hash_map->data[h]; p; p = p->next)
+    {
+        if (strcmp(p->key, key) == 0)
+        {
+            p->value = value;
+            *updated = true;
+            free(new);
+            return true;
+        }
+    }
+
+    new->next = hash_map->data[h];
+    new->key = key;
+    new->value = value;
+    hash_map->data[h] = new;
+    return true;
+}
+
+void hash_map_free(struct hash_map *hash_map)
+{
+    if (hash_map == NULL)
+    {
+        return;
+    }
+
+    if (hash_map->data == NULL)
+    {
+        free(hash_map);
+        return;
+    }
+
+    for (size_t i = 0; i < hash_map->size; i++)
+    {
+        while (hash_map->data[i])
+        {
+            struct pair_list *tmp = hash_map->data[i]->next;
+            free(hash_map->data[i]);
+            hash_map->data[i] = tmp;
+        }
+    }
+
+    free(hash_map->data);
+    free(hash_map);
+}
+
+void hash_map_dump(struct hash_map *hash_map)
+{
+    if (hash_map == NULL || hash_map->data == NULL)
+    {
+        return;
+    }
+
+    for (size_t i = 0; i < hash_map->size; i++)
+    {
+        if (hash_map->data[i] != NULL)
+        {
+            printf("%s: %s", hash_map->data[i]->key, hash_map->data[i]->value);
+            for (struct pair_list *p = hash_map->data[i]->next; p; p = p->next)
+            {
+                printf(", %s: %s", p->key, p->value);
+            }
+            printf("\n");
+        }
+    }
+}
+
+const char *hash_map_get(const struct hash_map *hash_map, const char *key)
+{
+    if (hash_map == NULL || hash_map->data == NULL || hash_map->size == 0)
+    {
+        return NULL;
+    }
+
+    size_t h = hash(key);
+    if (h >= hash_map->size)
+    {
+        h %= hash_map->size;
+    }
+    struct pair_list *p;
+    for (p = hash_map->data[h]; p && strcmp(p->key, key) != 0; p = p->next)
+    {
+        continue;
+    }
+
+    if (p)
+    {
+        return p->value;
+    }
+    return NULL;
+}
+
+bool hash_map_remove(struct hash_map *hash_map, const char *key)
+{
+    if (hash_map == NULL || hash_map->data == NULL || hash_map->size == 0)
+    {
+        return false;
+    }
+
+    size_t h = hash(key);
+    if (h >= hash_map->size)
+    {
+        h %= hash_map->size;
+    }
+    if (hash_map->data[h] == NULL)
+    {
+        return false;
+    }
+
+    if (strcmp(hash_map->data[h]->key, key) == 0)
+    {
+        struct pair_list *tmp = hash_map->data[h]->next;
+        free(hash_map->data[h]);
+        hash_map->data[h] = tmp;
+        return true;
+    }
+
+    struct pair_list *p;
+    for (p = hash_map->data[h]; p->next; p = p->next)
+    {
+        if (strcmp(p->next->key, key) == 0)
+        {
+            struct pair_list *tmp = p->next->next;
+            free(p->next);
+            p->next = tmp;
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/graphs/piscine/hash_map/hash_map.h b/graphs/piscine/hash_map/hash_map.h
new file mode 100644
index 0000000..c731eab
--- /dev/null
+++ b/graphs/piscine/hash_map/hash_map.h
@@ -0,0 +1,29 @@
+#ifndef HASH_MAP_H
+#define HASH_MAP_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct pair_list
+{
+    const char *key;
+    char *value;
+    struct pair_list *next;
+};
+
+struct hash_map
+{
+    struct pair_list **data;
+    size_t size;
+};
+
+size_t hash(const char *str);
+struct hash_map *hash_map_init(size_t size);
+bool hash_map_insert(struct hash_map *hash_map, const char *key, char *value,
+                     bool *updated);
+void hash_map_free(struct hash_map *hash_map);
+void hash_map_dump(struct hash_map *hash_map);
+const char *hash_map_get(const struct hash_map *hash_map, const char *key);
+bool hash_map_remove(struct hash_map *hash_map, const char *key);
+
+#endif /* ! HASH_MAP_H */
diff --git a/graphs/piscine/heap/Makefile b/graphs/piscine/heap/Makefile
new file mode 100644
index 0000000..2ed972b
--- /dev/null
+++ b/graphs/piscine/heap/Makefile
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS = -Wall -Werror -Wvla -Wextra -std=c99 -pedantic
+SRC = add.c del.c print.c pop.c create.c
+OBJ = $(SRC:.c=.o)
+
+.PHONY: library clean
+
+library: $(OBJ)
+	ar csr libheap.a $(OBJ)
+
+$(OBJ): $(SRC)
+
+clean:
+	$(RM) libheap.a $(OBJ)
diff --git a/graphs/piscine/heap/add.c b/graphs/piscine/heap/add.c
new file mode 100644
index 0000000..78a4db8
--- /dev/null
+++ b/graphs/piscine/heap/add.c
@@ -0,0 +1,39 @@
+#include <stdlib.h>
+
+#include "heap.h"
+
+void heapify(int arr[], int n, int i)
+{
+    if (i == 0)
+        return;
+    int parent = (i - 1) / 2;
+    if (parent >= 0)
+    {
+        if (arr[i] > arr[parent])
+        {
+            int tmp = arr[i];
+            arr[i] = arr[parent];
+            arr[parent] = tmp;
+            heapify(arr, n, parent);
+        }
+    }
+}
+
+void add(struct heap *heap, int val)
+{
+    if (heap->size == heap->capacity)
+    {
+        heap->array = realloc(heap->array, heap->capacity * 2 * sizeof(int));
+        if (heap->array == NULL)
+        {
+            free(heap);
+            return;
+        }
+        heap->capacity *= 2;
+    }
+
+    heap->array[heap->size] = val;
+    heap->size++;
+
+    heapify(heap->array, heap->size, heap->size - 1);
+}
diff --git a/graphs/piscine/heap/create.c b/graphs/piscine/heap/create.c
new file mode 100644
index 0000000..f0675ad
--- /dev/null
+++ b/graphs/piscine/heap/create.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+
+#include "heap.h"
+
+struct heap *create_heap(void)
+{
+    struct heap *res = malloc(sizeof(struct heap));
+    if (res == NULL)
+        return NULL;
+    res->size = 0;
+    res->capacity = 8;
+    res->array = malloc(8 * sizeof(int));
+    if (res->array == NULL)
+    {
+        free(res);
+        return NULL;
+    }
+    return res;
+}
diff --git a/graphs/piscine/heap/del.c b/graphs/piscine/heap/del.c
new file mode 100644
index 0000000..4d2ae35
--- /dev/null
+++ b/graphs/piscine/heap/del.c
@@ -0,0 +1,9 @@
+#include <stdlib.h>
+
+#include "heap.h"
+
+void delete_heap(struct heap *heap)
+{
+    free(heap->array);
+    free(heap);
+}
diff --git a/graphs/piscine/heap/heap.h b/graphs/piscine/heap/heap.h
new file mode 100644
index 0000000..085f436
--- /dev/null
+++ b/graphs/piscine/heap/heap.h
@@ -0,0 +1,20 @@
+#ifndef HEAP_H
+#define HEAP_H
+
+// size_t
+#include <stddef.h>
+
+struct heap
+{
+    size_t size;
+    size_t capacity;
+    int *array;
+};
+
+struct heap *create_heap(void);
+void add(struct heap *heap, int val);
+int pop(struct heap *heap);
+void delete_heap(struct heap *heap);
+void print_heap(const struct heap *heap);
+
+#endif /* !HEAP_H */
diff --git a/graphs/piscine/heap/pop.c b/graphs/piscine/heap/pop.c
new file mode 100644
index 0000000..55e063f
--- /dev/null
+++ b/graphs/piscine/heap/pop.c
@@ -0,0 +1,49 @@
+#include <assert.h>
+#include <stdlib.h>
+
+#include "heap.h"
+
+void heapify2(struct heap *h, size_t i)
+{
+    size_t max = i;
+    if (2 * i + 1 < h->size && h->array[2 * i + 1] > h->array[max])
+        max = 2 * i + 1;
+    if (2 * i + 2 < h->size && h->array[2 * i + 2] > h->array[max])
+        max = 2 * i + 2;
+    if (max != i)
+    {
+        int tmp = h->array[i];
+        h->array[i] = h->array[max];
+        h->array[max] = tmp;
+        heapify2(h, max);
+    }
+}
+
+int pop(struct heap *heap)
+{
+    assert(heap->size != 0);
+    if (heap->size == 1)
+    {
+        heap->size--;
+        return heap->array[0];
+    }
+    else
+    {
+        int res = heap->array[0];
+        heap->array[0] = heap->array[heap->size - 1];
+        heap->size--;
+        heapify2(heap, 0);
+        if (heap->size < heap->capacity / 2 && heap->capacity > 8)
+        {
+            heap->array =
+                realloc(heap->array, (heap->capacity / 2) * sizeof(int));
+            if (heap->array == NULL)
+            {
+                free(heap);
+                return -1;
+            }
+            heap->capacity /= 2;
+        }
+        return res;
+    }
+}
diff --git a/graphs/piscine/heap/print.c b/graphs/piscine/heap/print.c
new file mode 100644
index 0000000..f5bbe95
--- /dev/null
+++ b/graphs/piscine/heap/print.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "heap.h"
+
+void print_rec(const struct heap *h, size_t i, int root)
+{
+    if (i >= h->size)
+        return;
+    if (!root)
+        printf(" ");
+    else
+        root = 0;
+    printf("%d", h->array[i]);
+    if (i == h->size - 1)
+    {
+        return;
+    }
+    print_rec(h, i * 2 + 1, root);
+    print_rec(h, i * 2 + 2, root);
+}
+
+void print_heap(const struct heap *heap)
+{
+    print_rec(heap, 0, 1);
+    printf("\n");
+}
diff --git a/graphs/piscine/hello_friends/hello.c b/graphs/piscine/hello_friends/hello.c
new file mode 100644
index 0000000..63df2f1
--- /dev/null
+++ b/graphs/piscine/hello_friends/hello.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+    if (argc == 1)
+        printf("Hello World!\n");
+    else
+        for (int i = 1; i < argc; i++)
+        {
+            printf("Hello %s!\n", argv[i]);
+        }
+    return 0;
+}
diff --git a/graphs/piscine/hello_world/hello.c b/graphs/piscine/hello_world/hello.c
new file mode 100644
index 0000000..0681c18
--- /dev/null
+++ b/graphs/piscine/hello_world/hello.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void)
+{
+    puts("Hello World!");
+    return 0;
+}
diff --git a/graphs/piscine/hello_world_shebang/hello.sh b/graphs/piscine/hello_world_shebang/hello.sh
new file mode 100755
index 0000000..8dc4f64
--- /dev/null
+++ b/graphs/piscine/hello_world_shebang/hello.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "Hello World!"
diff --git a/graphs/piscine/hill_array/hill_array.c b/graphs/piscine/hill_array/hill_array.c
new file mode 100644
index 0000000..14d3a85
--- /dev/null
+++ b/graphs/piscine/hill_array/hill_array.c
@@ -0,0 +1,43 @@
+#include "hill_array.h"
+
+int top_of_the_hill(int tab[], size_t len)
+{
+    if (len == 0)
+    {
+        return -1;
+    }
+
+    int top = 0;
+    size_t i = 0;
+
+    while (i + 1 < len && tab[i] <= tab[i + 1])
+    {
+        if (tab[i] < 0 || tab[i + 1] < 0)
+        {
+            return -1;
+        }
+        if (tab[i] != tab[i + 1])
+        {
+            top = i + 1;
+        }
+        i++;
+    }
+
+    while (i + 1 < len && tab[i] >= tab[i + 1])
+    {
+        if (tab[i] < 0 || tab[i + 1] < 0)
+        {
+            return -1;
+        }
+        i++;
+    }
+
+    if (i + 1 == len)
+    {
+        return top;
+    }
+    else
+    {
+        return -1;
+    }
+}
diff --git a/graphs/piscine/hill_array/hill_array.h b/graphs/piscine/hill_array/hill_array.h
new file mode 100644
index 0000000..3152c19
--- /dev/null
+++ b/graphs/piscine/hill_array/hill_array.h
@@ -0,0 +1,8 @@
+#ifndef HILL_ARRAY_H
+#define HILL_ARRAY_H
+
+#include <stddef.h>
+
+int top_of_the_hill(int tab[], size_t len);
+
+#endif /* !HILL_ARRAY_H */
diff --git a/graphs/piscine/insertion_sort/insertion_sort.c b/graphs/piscine/insertion_sort/insertion_sort.c
new file mode 100644
index 0000000..2edd195
--- /dev/null
+++ b/graphs/piscine/insertion_sort/insertion_sort.c
@@ -0,0 +1,20 @@
+#include "insertion_sort.h"
+
+#include <stddef.h>
+
+void insertion_sort(void **array, f_cmp comp)
+{
+    if (array == NULL || *array == NULL)
+    {
+        return;
+    }
+    for (int i = 1; array[i]; i++)
+    {
+        for (int j = i; j > 0 && comp(array[j - 1], array[j]) > 0; j--)
+        {
+            void *tmp = array[j];
+            array[j] = array[j - 1];
+            array[j - 1] = tmp;
+        }
+    }
+}
diff --git a/graphs/piscine/insertion_sort/insertion_sort.h b/graphs/piscine/insertion_sort/insertion_sort.h
new file mode 100644
index 0000000..a7ba674
--- /dev/null
+++ b/graphs/piscine/insertion_sort/insertion_sort.h
@@ -0,0 +1,8 @@
+#ifndef INSERTION_SORT_H
+#define INSERTION_SORT_H
+
+typedef int (*f_cmp)(const void *, const void *);
+
+void insertion_sort(void **array, f_cmp comp);
+
+#endif /* ! INSERTION_SORT_H */
diff --git a/graphs/piscine/inside/inside.sh b/graphs/piscine/inside/inside.sh
new file mode 100755
index 0000000..c6872fa
--- /dev/null
+++ b/graphs/piscine/inside/inside.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+if [ $# -ne 1 ]; then 
+	echo Sorry, expected 1 argument but $# were passed
+	exit 1
+fi
+
+if [ -f $1 ]; then
+	cat $1
+	exit 0
+else
+	echo "$1:
+	is not a valid file"
+	exit 2
+fi
diff --git a/graphs/piscine/inside_noif/inside_noif.sh b/graphs/piscine/inside_noif/inside_noif.sh
new file mode 100755
index 0000000..d4ed8c9
--- /dev/null
+++ b/graphs/piscine/inside_noif/inside_noif.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+[ $# -ne 1 ] && echo Sorry, expected 1 argument but $# were passed && exit 1
+
+[ -f $1 ] && cat $1 && exit 0 || echo "$1:
+	is not a valid file" && exit 2
diff --git a/graphs/piscine/int_palindrome/int_palindrome.c b/graphs/piscine/int_palindrome/int_palindrome.c
new file mode 100644
index 0000000..6d6847f
--- /dev/null
+++ b/graphs/piscine/int_palindrome/int_palindrome.c
@@ -0,0 +1,18 @@
+int int_palindrome(int n)
+{
+    if (n < 0)
+    {
+        return 0;
+    }
+
+    int reversed = 0;
+    int m = n;
+
+    while (m > 0)
+    {
+        reversed = reversed * 10 + m % 10;
+        m /= 10;
+    }
+
+    return n == reversed;
+}
diff --git a/graphs/piscine/int_sqrt/int_sqrt.c b/graphs/piscine/int_sqrt/int_sqrt.c
new file mode 100644
index 0000000..4b2e5db
--- /dev/null
+++ b/graphs/piscine/int_sqrt/int_sqrt.c
@@ -0,0 +1,20 @@
+int int_sqrt(int n)
+{
+    if (n < 0)
+    {
+        return -1;
+    }
+
+    if (n == 0 || n == 1)
+    {
+        return n;
+    }
+
+    int i;
+    for (i = 1; i * i < n; i++)
+    {
+        continue;
+    }
+
+    return i - (i * i != n);
+}
diff --git a/graphs/piscine/io_count_words/count_words.c b/graphs/piscine/io_count_words/count_words.c
new file mode 100644
index 0000000..8b8c9a5
--- /dev/null
+++ b/graphs/piscine/io_count_words/count_words.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+
+int count_words(const char *file_in)
+{
+    if (file_in == NULL)
+    {
+        return -1;
+    }
+
+    FILE *f = fopen(file_in, "r");
+    if (f == NULL)
+    {
+        return -1;
+    }
+
+    int word = 0;
+    int count = 0;
+    int c;
+    while ((c = fgetc(f)) != EOF)
+    {
+        if ((c == ' ' || c == '\n' || c == '\t') && word == 1)
+        {
+            word = 0;
+        }
+        if (c != ' ' && c != '\n' && c != '\t' && word == 0)
+        {
+            word = 1;
+            count++;
+        }
+    }
+
+    return count;
+}
diff --git a/graphs/piscine/io_merge_files/merge_files.c b/graphs/piscine/io_merge_files/merge_files.c
new file mode 100644
index 0000000..26ac9cf
--- /dev/null
+++ b/graphs/piscine/io_merge_files/merge_files.c
@@ -0,0 +1,31 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+
+int merge_files(const char *file_1, const char *file_2)
+{
+    FILE *a = fopen(file_1, "a");
+    if (a == NULL)
+    {
+        return -1;
+    }
+    FILE *r = fopen(file_2, "r");
+    if (r == NULL)
+    {
+        return -1;
+    }
+
+    int c;
+    while ((c = fgetc(r)) != EOF)
+    {
+        if (fputc(c, a) == EOF)
+        {
+            return -1;
+        }
+    }
+
+    fclose(a);
+    fclose(r);
+
+    return 0;
+}
diff --git a/graphs/piscine/io_replace_line/replace_line.c b/graphs/piscine/io_replace_line/replace_line.c
new file mode 100644
index 0000000..7fd0e2a
--- /dev/null
+++ b/graphs/piscine/io_replace_line/replace_line.c
@@ -0,0 +1,50 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int replace_line(const char *file_in, const char *file_out, const char *content,
+                 int n)
+{
+    FILE *a = fopen(file_out, "w");
+    if (a == NULL)
+    {
+        return -1;
+    }
+    FILE *r = fopen(file_in, "r");
+    if (r == NULL)
+    {
+        return -1;
+    }
+
+    char *buf = NULL;
+    ssize_t e;
+    int l = 0;
+    size_t count = 0;
+    while ((e = getline(&buf, &count, r)) != 0 && e != -1)
+    {
+        if (l == n)
+        {
+            if (fputs(content, a) == EOF)
+            {
+                free(buf);
+                return -1;
+            }
+        }
+        else
+        {
+            if (fputs(buf, a) == EOF)
+            {
+                free(buf);
+                return -1;
+            }
+        }
+        l++;
+    }
+
+    fclose(a);
+    fclose(r);
+    free(buf);
+
+    return 0;
+}
diff --git a/graphs/piscine/levenshtein/levenshtein.c b/graphs/piscine/levenshtein/levenshtein.c
new file mode 100644
index 0000000..4da9397
--- /dev/null
+++ b/graphs/piscine/levenshtein/levenshtein.c
@@ -0,0 +1,72 @@
+#include "levenshtein.h"
+
+#include <stdio.h>
+
+size_t max(size_t a, size_t b)
+{
+    if (a >= b)
+    {
+        return a;
+    }
+    return b;
+}
+
+size_t min(size_t a, size_t b)
+{
+    if (a <= b)
+    {
+        return a;
+    }
+    return b;
+}
+
+size_t min_3(size_t a, size_t b, size_t c)
+{
+    if (a <= b)
+    {
+        if (a <= c)
+        {
+            return a;
+        }
+        return c;
+    }
+    else
+    {
+        if (b <= c)
+        {
+            return b;
+        }
+        return c;
+    }
+}
+
+size_t my_strlen(const char *s)
+{
+    size_t i;
+    for (i = 0; s[i]; i++)
+    {
+        continue;
+    }
+    return i;
+}
+
+size_t levenshtein(const char *s1, const char *s2)
+{
+    size_t l1 = my_strlen(s1);
+    size_t l2 = my_strlen(s2);
+    if (min(l1, l2) == 0)
+    {
+        return max(l1, l2);
+    }
+
+    if (s1[0] == s2[0])
+    {
+        return levenshtein(s1 + 1, s2 + 1);
+    }
+
+    size_t lev1 = levenshtein(s1 + 1, s2);
+    size_t lev2 = levenshtein(s1, s2 + 1);
+    size_t lev3 = levenshtein(s1 + 1, s2 + 1);
+
+    return 1 + min_3(lev1, lev2, lev3);
+}
diff --git a/graphs/piscine/levenshtein/levenshtein.h b/graphs/piscine/levenshtein/levenshtein.h
new file mode 100644
index 0000000..70a5a7b
--- /dev/null
+++ b/graphs/piscine/levenshtein/levenshtein.h
@@ -0,0 +1,8 @@
+#ifndef LEVENSHTEIN_H
+#define LEVENSHTEIN_H
+
+#include <stddef.h>
+
+size_t levenshtein(const char *s1, const char *s2);
+
+#endif /* !LEVENSHTEIN_H */
diff --git a/graphs/piscine/main.c b/graphs/piscine/main.c
new file mode 100644
index 0000000..4062426
--- /dev/null
+++ b/graphs/piscine/main.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+//#include "traffic_lights/traffic_lights.h"
+unsigned char rol(unsigned char value, unsigned char roll);
+
+int main(void)
+{
+    unsigned char l1 = 0b01010101;
+    unsigned char l2 = 3;
+
+    printf("l1: %b", rol(l1, l2));
+
+    return 0;
+}
diff --git a/graphs/piscine/my_abs/my_abs.c b/graphs/piscine/my_abs/my_abs.c
new file mode 100644
index 0000000..fc89d2f
--- /dev/null
+++ b/graphs/piscine/my_abs/my_abs.c
@@ -0,0 +1,11 @@
+int my_abs(int n)
+{
+    if (n < 0)
+    {
+        return -n;
+    }
+    else
+    {
+        return n;
+    }
+}
diff --git a/graphs/piscine/my_atoi/my_atoi.c b/graphs/piscine/my_atoi/my_atoi.c
new file mode 100644
index 0000000..ca185a5
--- /dev/null
+++ b/graphs/piscine/my_atoi/my_atoi.c
@@ -0,0 +1,61 @@
+#include "my_atoi.h"
+
+int my_atoi(const char *str)
+{
+    int res = 0;
+
+    // str error check
+    if (str == NULL || *str == '0')
+    {
+        return 0;
+    }
+
+    // trim whitespaces
+    for (; *str && *str == ' '; str++)
+    {
+        continue;
+    }
+
+    // move to end of str
+    size_t l;
+    for (l = 0; str[l]; l++)
+    {
+        continue;
+    }
+    l--;
+
+    // prepare for calculations
+    int factor = 1;
+
+    // actual conversion of up to the second element of str (potential sign)
+    for (; l > 0; l--)
+    {
+        char val = str[l];
+        if (val < '0' || val > '9')
+        {
+            return 0;
+        }
+        val -= '0';
+        res += val * factor;
+
+        factor *= 10;
+    }
+
+    // l should be 0 by now
+    if (str[l] == '-')
+    {
+        return -res;
+    }
+    else if (str[l] != '+')
+    {
+        int val = str[l];
+        if (val < '0' || val > '9')
+        {
+            return 0;
+        }
+        val -= '0';
+        return res + val * factor;
+    }
+
+    return res;
+}
diff --git a/graphs/piscine/my_atoi/my_atoi.h b/graphs/piscine/my_atoi/my_atoi.h
new file mode 100644
index 0000000..b520d09
--- /dev/null
+++ b/graphs/piscine/my_atoi/my_atoi.h
@@ -0,0 +1,8 @@
+#ifndef MY_ATOI_H
+#define MY_ATOI_H
+
+#include <stddef.h>
+
+int my_atoi(const char *str);
+
+#endif /* ! MY_ATOI_H */
diff --git a/graphs/piscine/my_atoi_base/my_atoi_base.c b/graphs/piscine/my_atoi_base/my_atoi_base.c
new file mode 100644
index 0000000..46b4560
--- /dev/null
+++ b/graphs/piscine/my_atoi_base/my_atoi_base.c
@@ -0,0 +1,86 @@
+#include "my_atoi_base.h"
+
+int val_in_base(char c, const char *base)
+{
+    size_t i;
+    for (i = 0; base[i] && base[i] != c; i++)
+    {
+        continue;
+    }
+
+    if (base[i])
+    {
+        return i;
+    }
+
+    return -1;
+}
+
+int base_size(const char *base)
+{
+    int res;
+    for (res = 0; base[res]; res++)
+    {
+        continue;
+    }
+    return res;
+}
+
+int my_atoi_base(const char *str, const char *base)
+{
+    int res = 0;
+
+    // str error check
+    if (str == NULL || *str == '0')
+    {
+        return 0;
+    }
+
+    // trim whitespaces
+    for (; *str && *str == ' '; str++)
+    {
+        continue;
+    }
+
+    // move to end of str
+    size_t l;
+    for (l = 0; str[l]; l++)
+    {
+        continue;
+    }
+    l--;
+
+    // prepare for calculations
+    int b = base_size(base);
+    int factor = 1;
+
+    // actual conversion of up to the second element of str (potential sign)
+    for (; l > 0; l--)
+    {
+        int val = val_in_base(str[l], base);
+        if (val == -1)
+        {
+            return 0;
+        }
+        res += val * factor;
+
+        factor *= b;
+    }
+
+    // l should be 0 by now
+    if (str[l] == '-')
+    {
+        return -res;
+    }
+    else if (str[l] != '+')
+    {
+        int val = val_in_base(str[l], base);
+        if (val == -1)
+        {
+            return 0;
+        }
+        return res + val * factor;
+    }
+
+    return res;
+}
diff --git a/graphs/piscine/my_atoi_base/my_atoi_base.h b/graphs/piscine/my_atoi_base/my_atoi_base.h
new file mode 100644
index 0000000..296ae23
--- /dev/null
+++ b/graphs/piscine/my_atoi_base/my_atoi_base.h
@@ -0,0 +1,8 @@
+#ifndef MY_ATOI_BASE_H
+#define MY_ATOI_BASE_H
+
+#include <stddef.h>
+
+int my_atoi_base(const char *str, const char *base);
+
+#endif /* ! MY_ATOI_BASE_H */
diff --git a/graphs/piscine/my_bc/my_bc.sh b/graphs/piscine/my_bc/my_bc.sh
new file mode 100755
index 0000000..f675838
--- /dev/null
+++ b/graphs/piscine/my_bc/my_bc.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+[ -n "$1" ] && echo "$(($1))" && exit 0
+
+while IFS='' read -r line; do
+    [ -z "$line" ] && exit 0 || echo "$(($line))"
+done
diff --git a/graphs/piscine/my_c_tail/main.c b/graphs/piscine/my_c_tail/main.c
new file mode 100644
index 0000000..ba33337
--- /dev/null
+++ b/graphs/piscine/my_c_tail/main.c
@@ -0,0 +1,10 @@
+#include <stdlib.h>
+
+#include "my_c_tail.h"
+
+int main(int argc, char *argv[])
+{
+    if (argc > 1)
+        stdintail(atoi(argv[1]));
+    return 0;
+}
diff --git a/graphs/piscine/my_c_tail/my_c_tail.c b/graphs/piscine/my_c_tail/my_c_tail.c
new file mode 100644
index 0000000..790240c
--- /dev/null
+++ b/graphs/piscine/my_c_tail/my_c_tail.c
@@ -0,0 +1,46 @@
+#include "my_c_tail.h"

+

+#include <stdlib.h>

+#include <unistd.h>

+

+void stdintail(unsigned int n)

+{

+    char **lines = calloc(2000, sizeof(char *));

+    lines[0] = malloc(350 * sizeof(char));

+    size_t m = 0;

+    char c;

+    size_t i = 0;

+    while (read(STDIN_FILENO, &c, 1))

+    {

+        if (c == '\n')

+        {

+            lines[m][i] = '\0';

+            lines[++m] = malloc(350 * sizeof(char));

+            i = 0;

+        }

+        else

+        {

+            lines[m][i++] = c;

+        }

+    }

+

+    size_t j;

+    if (m > n)

+    {

+        for (size_t i = 0; i < m - n; i++)

+            free(lines[i]);

+        j = m - n;

+    }

+    else

+        j = 0;

+

+    for (; j < m; j++)

+    {

+        for (size_t i = 0; lines[j][i]; i++)

+            write(STDOUT_FILENO, &(lines[j][i]), 1);

+        write(STDOUT_FILENO, "\n", 1);

+        free(lines[j]);

+    }

+    free(lines[m]);

+    free(lines);

+}

diff --git a/graphs/piscine/my_c_tail/my_c_tail.h b/graphs/piscine/my_c_tail/my_c_tail.h
new file mode 100644
index 0000000..172c844
--- /dev/null
+++ b/graphs/piscine/my_c_tail/my_c_tail.h
@@ -0,0 +1,6 @@
+#ifndef MY_C_TAIL_H
+#define MY_C_TAIL_H
+
+void stdintail(unsigned int n);
+
+#endif // MY_C_TAIL_H
diff --git a/graphs/piscine/my_calloc/my_calloc.c b/graphs/piscine/my_calloc/my_calloc.c
new file mode 100644
index 0000000..5a2f7f2
--- /dev/null
+++ b/graphs/piscine/my_calloc/my_calloc.c
@@ -0,0 +1,11 @@
+#include <stdlib.h>
+
+void *my_calloc(size_t n, size_t size)
+{
+    char *res = malloc(n * size);
+    for (size_t i = 0; i < n * size; i++)
+    {
+        res[i] = 0;
+    }
+    return res;
+}
diff --git a/graphs/piscine/my_calloc/my_calloc.h b/graphs/piscine/my_calloc/my_calloc.h
new file mode 100644
index 0000000..44bf9a2
--- /dev/null
+++ b/graphs/piscine/my_calloc/my_calloc.h
@@ -0,0 +1,8 @@
+#ifndef MY_CALLOC_H
+#define MY_CALLOC_H
+
+#include <stdlib.h>
+
+void *my_calloc(size_t n, size_t size);
+
+#endif /* ! MY_CALLOC_H */
diff --git a/graphs/piscine/my_file/my_file.sh b/graphs/piscine/my_file/my_file.sh
new file mode 100755
index 0000000..93c0c20
--- /dev/null
+++ b/graphs/piscine/my_file/my_file.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+for arg; do
+	if [ -f "$arg" ]; then
+		echo $arg: file
+	elif [ -d "$arg" ]; then
+		echo $arg: directory
+	else
+		echo $arg: unknown
+	fi
+done
diff --git a/graphs/piscine/my_first_variable/create.sh b/graphs/piscine/my_first_variable/create.sh
new file mode 100755
index 0000000..d9264db
--- /dev/null
+++ b/graphs/piscine/my_first_variable/create.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+my_local_frais="Javotte"
+
+echo My frais is $my_local_frais
diff --git a/graphs/piscine/my_first_variable/edit.sh b/graphs/piscine/my_first_variable/edit.sh
new file mode 100755
index 0000000..e47e0c3
--- /dev/null
+++ b/graphs/piscine/my_first_variable/edit.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+my_local_frais="Javotte"
+
+echo My frais is $my_local_frais
+
+my_local_frais="Pulpa"
+
+echo My frais is now $my_local_frais
diff --git a/graphs/piscine/my_first_variable/use.sh b/graphs/piscine/my_first_variable/use.sh
new file mode 100755
index 0000000..f9d462e
--- /dev/null
+++ b/graphs/piscine/my_first_variable/use.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "My frais is $MY_ENV_FRAIS"
diff --git a/graphs/piscine/my_itoa/my_itoa.c b/graphs/piscine/my_itoa/my_itoa.c
new file mode 100644
index 0000000..cbb6f73
--- /dev/null
+++ b/graphs/piscine/my_itoa/my_itoa.c
@@ -0,0 +1,38 @@
+#include "my_itoa.h"
+
+char *my_itoa(int value, char *s)
+{
+    if (value == 0)
+    {
+        s[0] = '0';
+        s[1] = '\0';
+        return s;
+    }
+    char *head = s;
+    if (value < 0)
+    {
+        s[0] = '-';
+        s++;
+        value = -value;
+    }
+
+    // count numbers
+    int t = value;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    // n = number count
+    s[n] = '\0';
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = value % 10 + '0';
+        value /= 10;
+    }
+
+    return head;
+}
diff --git a/graphs/piscine/my_itoa/my_itoa.h b/graphs/piscine/my_itoa/my_itoa.h
new file mode 100644
index 0000000..8e84c72
--- /dev/null
+++ b/graphs/piscine/my_itoa/my_itoa.h
@@ -0,0 +1,6 @@
+#ifndef MY_ITOA_H
+#define MY_ITOA_H
+
+char *my_itoa(int value, char *s);
+
+#endif /* ! MY_ITOA_H */
diff --git a/graphs/piscine/my_itoa_base/my_itoa_base.c b/graphs/piscine/my_itoa_base/my_itoa_base.c
new file mode 100644
index 0000000..29b3042
--- /dev/null
+++ b/graphs/piscine/my_itoa_base/my_itoa_base.c
@@ -0,0 +1,49 @@
+#include "my_itoa_base.h"
+
+int base_count(const char *base)
+{
+    int i;
+    for (i = 0; base[i]; i++)
+    {
+        continue;
+    }
+    return i;
+}
+
+char *my_itoa_base(int n, char *s, const char *base)
+{
+    if (n == 0)
+    {
+        s[0] = base[0];
+        s[1] = '\0';
+        return s;
+    }
+    char *head = s;
+    if (n < 0)
+    {
+        s[0] = '-';
+        s++;
+        n = -n;
+    }
+
+    // count numbers
+    int t = n;
+    int m = 0;
+    int b = base_count(base);
+    while (t > 0)
+    {
+        t /= b;
+        m++;
+    }
+
+    // n = number count
+    s[m] = '\0';
+    m--;
+    for (; m >= 0; m--)
+    {
+        s[m] = base[n % b];
+        n /= b;
+    }
+
+    return head;
+}
diff --git a/graphs/piscine/my_itoa_base/my_itoa_base.h b/graphs/piscine/my_itoa_base/my_itoa_base.h
new file mode 100644
index 0000000..0be6314
--- /dev/null
+++ b/graphs/piscine/my_itoa_base/my_itoa_base.h
@@ -0,0 +1,6 @@
+#ifndef MY_ITOA_BASE_H
+#define MY_ITOA_BASE_H
+
+char *my_itoa_base(int n, char *s, const char *base);
+
+#endif /* ! MY_ITOA_BASE_H */
diff --git a/graphs/piscine/my_memcmp/my_memcmp.c b/graphs/piscine/my_memcmp/my_memcmp.c
new file mode 100644
index 0000000..d498360
--- /dev/null
+++ b/graphs/piscine/my_memcmp/my_memcmp.c
@@ -0,0 +1,18 @@
+#include "my_memcmp.h"
+
+int my_memcmp(const void *s1, const void *s2, size_t num)
+{
+    if (num == 0)
+    {
+        return 0;
+    }
+    const unsigned char *a = s1;
+    const unsigned char *b = s2;
+
+    for (; num - 1 && *a == *b; a++, b++, num--)
+    {
+        continue;
+    }
+
+    return *a - *b;
+}
diff --git a/graphs/piscine/my_memcmp/my_memcmp.h b/graphs/piscine/my_memcmp/my_memcmp.h
new file mode 100644
index 0000000..d17cbe6
--- /dev/null
+++ b/graphs/piscine/my_memcmp/my_memcmp.h
@@ -0,0 +1,8 @@
+#ifndef MY_MEMCMP_H
+#define MY_MEMCMP_H
+
+#include <stddef.h>
+
+int my_memcmp(const void *s1, const void *s2, size_t num);
+
+#endif /* !MY_MEMCMP_H */
diff --git a/graphs/piscine/my_memcpy/my_memcpy.c b/graphs/piscine/my_memcpy/my_memcpy.c
new file mode 100644
index 0000000..a6a48d4
--- /dev/null
+++ b/graphs/piscine/my_memcpy/my_memcpy.c
@@ -0,0 +1,28 @@
+#include "my_memcpy.h"
+
+void *my_memcpy(void *dest, const void *source, size_t num)
+{
+    char *d = dest;
+    const char *s = source;
+    if (dest > source) // reverse array
+    {
+        size_t l = num;
+        for (; l > 0; l--)
+        {
+            d[l - 1] = s[l - 1];
+        }
+    }
+    else
+    {
+        for (size_t i = 0; i < num; i++)
+        {
+            d[i] = s[i];
+        }
+    }
+    return dest;
+}
+
+int main(void)
+{
+    return 0;
+}
diff --git a/graphs/piscine/my_memcpy/my_memcpy.h b/graphs/piscine/my_memcpy/my_memcpy.h
new file mode 100644
index 0000000..bc1b926
--- /dev/null
+++ b/graphs/piscine/my_memcpy/my_memcpy.h
@@ -0,0 +1,8 @@
+#ifndef MY_MEMCPY_H
+#define MY_MEMCPY_H
+
+#include <stddef.h>
+
+void *my_memcpy(void *dest, const void *source, size_t num);
+
+#endif /* ! MY_MEMCPY_H */
diff --git a/graphs/piscine/my_memmove/my_memmove.c b/graphs/piscine/my_memmove/my_memmove.c
new file mode 100644
index 0000000..bb360a5
--- /dev/null
+++ b/graphs/piscine/my_memmove/my_memmove.c
@@ -0,0 +1,23 @@
+#include "my_memmove.h"
+
+void *my_memmove(void *dest, const void *src, size_t n)
+{
+    char *d = dest;
+    const char *s = src;
+    if (dest > src) // reverse array
+    {
+        size_t l = n;
+        for (; l > 0; l--)
+        {
+            d[l - 1] = s[l - 1];
+        }
+    }
+    else
+    {
+        for (size_t i = 0; i < n; i++)
+        {
+            d[i] = s[i];
+        }
+    }
+    return dest;
+}
diff --git a/graphs/piscine/my_memmove/my_memmove.h b/graphs/piscine/my_memmove/my_memmove.h
new file mode 100644
index 0000000..cb253b7
--- /dev/null
+++ b/graphs/piscine/my_memmove/my_memmove.h
@@ -0,0 +1,8 @@
+#ifndef MY_MEMMOVE_H
+#define MY_MEMMOVE_H
+
+#include <stddef.h>
+
+void *my_memmove(void *dest, const void *src, size_t n);
+
+#endif /* ! MY_MEMMOVE_H */
diff --git a/graphs/piscine/my_memset/my_memset.c b/graphs/piscine/my_memset/my_memset.c
new file mode 100644
index 0000000..243a5ac
--- /dev/null
+++ b/graphs/piscine/my_memset/my_memset.c
@@ -0,0 +1,12 @@
+#include "my_memset.h"
+
+void *my_memset(void *s, int c, size_t n)
+{
+    unsigned char *t = s;
+    for (size_t i = 0; i < n; i++)
+    {
+        t[i] = c;
+    }
+
+    return t;
+}
diff --git a/graphs/piscine/my_memset/my_memset.h b/graphs/piscine/my_memset/my_memset.h
new file mode 100644
index 0000000..e5ed0f0
--- /dev/null
+++ b/graphs/piscine/my_memset/my_memset.h
@@ -0,0 +1,6 @@
+#ifndef MY_MEMSET_H
+#define MY_MEMSET_H
+
+#include <stddef.h>
+
+#endif /* ! MY_MEMSET_H */
diff --git a/graphs/piscine/my_pow/my_pow.c b/graphs/piscine/my_pow/my_pow.c
new file mode 100644
index 0000000..f529d87
--- /dev/null
+++ b/graphs/piscine/my_pow/my_pow.c
@@ -0,0 +1,13 @@
+int my_pow(int a, int b)
+{
+    if (!a)
+        return b == 0;
+    int res = 1;
+    for (int i = 0; i < b / 2; i++)
+    {
+        res *= a * a;
+    }
+    if (b % 2)
+        res *= a;
+    return res;
+}
diff --git a/graphs/piscine/my_round/my_round.c b/graphs/piscine/my_round/my_round.c
new file mode 100644
index 0000000..324bc1d
--- /dev/null
+++ b/graphs/piscine/my_round/my_round.c
@@ -0,0 +1,6 @@
+int my_round(float n)
+{
+    if (n < 0)
+        return n - 0.5;
+    return n + 0.5;
+}
diff --git a/graphs/piscine/my_strcmp/my_strcmp.c b/graphs/piscine/my_strcmp/my_strcmp.c
new file mode 100644
index 0000000..d3ef3e3
--- /dev/null
+++ b/graphs/piscine/my_strcmp/my_strcmp.c
@@ -0,0 +1,11 @@
+#include "my_strcmp.h"
+
+int my_strcmp(const char *s1, const char *s2)
+{
+    for (; *s1 && *s1 == *s2; s1++, s2++)
+    {
+        continue;
+    }
+
+    return *s1 - *s2;
+}
diff --git a/graphs/piscine/my_strcmp/my_strcmp.h b/graphs/piscine/my_strcmp/my_strcmp.h
new file mode 100644
index 0000000..d89a00b
--- /dev/null
+++ b/graphs/piscine/my_strcmp/my_strcmp.h
@@ -0,0 +1,6 @@
+#ifndef MY_STRCMP_H
+#define MY_STRCMP_H
+
+#include <stddef.h>
+
+#endif /* ! MY_STRCMP_H */
diff --git a/graphs/piscine/my_strcpy/my_strcpy.c b/graphs/piscine/my_strcpy/my_strcpy.c
new file mode 100644
index 0000000..69ad5ee
--- /dev/null
+++ b/graphs/piscine/my_strcpy/my_strcpy.c
@@ -0,0 +1,13 @@
+#include <stdlib.h>
+
+char *my_strcpy(char *dest, const char *source)
+{
+    size_t i;
+    for (i = 0; source[i]; i++)
+    {
+        dest[i] = source[i];
+    }
+    dest[i] = '\0';
+
+    return dest;
+}
diff --git a/graphs/piscine/my_strlen/my_strlen.c b/graphs/piscine/my_strlen/my_strlen.c
new file mode 100644
index 0000000..ec80d0b
--- /dev/null
+++ b/graphs/piscine/my_strlen/my_strlen.c
@@ -0,0 +1,12 @@
+#include "my_strlen.h"
+
+size_t my_strlen(const char *s)
+{
+    size_t i;
+    for (i = 0; s[i]; i++)
+    {
+        continue;
+    }
+
+    return i;
+}
diff --git a/graphs/piscine/my_strlen/my_strlen.h b/graphs/piscine/my_strlen/my_strlen.h
new file mode 100644
index 0000000..02806cc
--- /dev/null
+++ b/graphs/piscine/my_strlen/my_strlen.h
@@ -0,0 +1,6 @@
+#ifndef MY_STRLEN_H
+#define MY_STRLEN_H
+
+#include <stddef.h>
+
+#endif /* ! MY_STRLEN_H */
diff --git a/graphs/piscine/my_strlowcase/my_strlowcase.c b/graphs/piscine/my_strlowcase/my_strlowcase.c
new file mode 100644
index 0000000..e52ea32
--- /dev/null
+++ b/graphs/piscine/my_strlowcase/my_strlowcase.c
@@ -0,0 +1,13 @@
+#include "my_strlowcase.h"
+
+void my_strlowcase(char *s)
+{
+    size_t i;
+    for (i = 0; s[i]; i++)
+    {
+        if (s[i] >= 'A' && s[i] <= 'Z')
+        {
+            s[i] += ('a' - 'A');
+        }
+    }
+}
diff --git a/graphs/piscine/my_strlowcase/my_strlowcase.h b/graphs/piscine/my_strlowcase/my_strlowcase.h
new file mode 100644
index 0000000..d4996b8
--- /dev/null
+++ b/graphs/piscine/my_strlowcase/my_strlowcase.h
@@ -0,0 +1,8 @@
+#ifndef MY_STRLOWCASE_H
+#define MY_STRLOWCASE_H
+
+#include <stddef.h>
+
+void my_strlowcase(char *str);
+
+#endif /* ! MY_STRLOWCASE_H */
diff --git a/graphs/piscine/my_strspn/my_strspn.c b/graphs/piscine/my_strspn/my_strspn.c
new file mode 100644
index 0000000..18bba0f
--- /dev/null
+++ b/graphs/piscine/my_strspn/my_strspn.c
@@ -0,0 +1,26 @@
+#include "my_strspn.h"
+
+int is_in(char c, const char *accept)
+{
+    for (; *accept && *accept != c; accept++)
+    {
+        continue;
+    }
+    return *accept != '\0';
+}
+
+size_t my_strspn(const char *s, const char *accept)
+{
+    if (s == NULL || *s == '\0')
+    {
+        return 0;
+    }
+
+    size_t res;
+    for (res = 0; *s && is_in(*s, accept) != 0; res++, s++)
+    {
+        continue;
+    }
+
+    return res;
+}
diff --git a/graphs/piscine/my_strspn/my_strspn.h b/graphs/piscine/my_strspn/my_strspn.h
new file mode 100644
index 0000000..f2d7759
--- /dev/null
+++ b/graphs/piscine/my_strspn/my_strspn.h
@@ -0,0 +1,8 @@
+#ifndef MY_STRSPN_H
+#define MY_STRSPN_H
+
+#include <stddef.h>
+
+size_t my_strspn(const char *s, const char *accept);
+
+#endif /* ! MY_STRSPN_H */
diff --git a/graphs/piscine/my_strstr/my_strstr.c b/graphs/piscine/my_strstr/my_strstr.c
new file mode 100644
index 0000000..36ac439
--- /dev/null
+++ b/graphs/piscine/my_strstr/my_strstr.c
@@ -0,0 +1,34 @@
+#include "my_strstr.h"
+
+#include <stddef.h>
+
+int my_strstr(const char *haystack, const char *needle)
+{
+    if (needle == NULL || *needle == '\0')
+    {
+        return 0;
+    }
+
+    for (int i = 0; haystack[i]; i++)
+    {
+        if (haystack[i] == needle[0])
+        {
+            int j;
+            for (j = 0;
+                 haystack[i + j] && needle[j] && needle[j] == haystack[i + j];
+                 j++)
+            {
+                continue;
+            }
+            if (needle[j] == '\0')
+            {
+                return i;
+            }
+            if (haystack[i + j] == '\0')
+            {
+                return -1;
+            }
+        }
+    }
+    return -1;
+}
diff --git a/graphs/piscine/my_strstr/my_strstr.h b/graphs/piscine/my_strstr/my_strstr.h
new file mode 100644
index 0000000..1b734b2
--- /dev/null
+++ b/graphs/piscine/my_strstr/my_strstr.h
@@ -0,0 +1,6 @@
+#ifndef MY_STRSTR_H
+#define MY_STRSTR_H
+
+int my_strstr(const char *haystack, const char *needle);
+
+#endif /* ! MY_STRSTR_H */
diff --git a/graphs/piscine/my_strtok_r/my_strtok_r.c b/graphs/piscine/my_strtok_r/my_strtok_r.c
new file mode 100644
index 0000000..ec052b7
--- /dev/null
+++ b/graphs/piscine/my_strtok_r/my_strtok_r.c
@@ -0,0 +1,51 @@
+#include "my_strtok_r.h"
+
+#include <stddef.h>
+
+static int is_delim(char c, const char *delims)
+{
+    for (const char *d = delims; *d; d++)
+    {
+        if (*d == c)
+            return 1;
+    }
+    return 0;
+}
+
+char *my_strtok_r(char *str, const char *delim, char **saveptr)
+{
+    if (str == NULL)
+    {
+        if (*saveptr == NULL)
+        {
+            return NULL;
+        }
+        str = *saveptr;
+    }
+
+    size_t i = 0;
+    while (str[i] != '\0' && is_delim(str[i], delim))
+    {
+        i++;
+    }
+    if (str[i] == '\0')
+    {
+        *saveptr = NULL;
+        return NULL;
+    }
+
+    char *res = str + i;
+
+    while (str[i] != '\0' && !is_delim(str[i], delim))
+    {
+        i++;
+    }
+    if (str[i] == '\0')
+    {
+        *saveptr = NULL;
+        return res;
+    }
+    *saveptr = str + i + 1;
+    str[i] = '\0';
+    return res;
+}
diff --git a/graphs/piscine/my_strtok_r/my_strtok_r.h b/graphs/piscine/my_strtok_r/my_strtok_r.h
new file mode 100644
index 0000000..5603729
--- /dev/null
+++ b/graphs/piscine/my_strtok_r/my_strtok_r.h
@@ -0,0 +1,6 @@
+#ifndef MY_STRTOK_R_H
+#define MY_STRTOK_R_H
+
+char *my_strtok_r(char *str, const char *delim, char **saveptr);
+
+#endif /* ! MY_STRTOK_R_H */
diff --git a/graphs/piscine/null_terminated_arrays/null_terminated_arrays.c b/graphs/piscine/null_terminated_arrays/null_terminated_arrays.c
new file mode 100644
index 0000000..32d2a17
--- /dev/null
+++ b/graphs/piscine/null_terminated_arrays/null_terminated_arrays.c
@@ -0,0 +1,50 @@
+#include "null_terminated_arrays.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+
+void reverse_array(const char **arr)
+{
+    const char **p;
+    for (p = arr; *p; p++)
+    {
+        continue;
+    }
+    p--;
+
+    while (p > arr)
+    {
+        const char *tmp = *p;
+        *p = *arr;
+        *arr = tmp;
+        arr++;
+        p--;
+    }
+}
+
+void reverse_matrix(const char ***matrix)
+{
+    const char ***p;
+    for (p = matrix; *p; p++)
+    {
+        continue;
+    }
+    p--;
+
+    while (p > matrix)
+    {
+        reverse_array(*p);
+        reverse_array(*matrix);
+        const char **tmp = *p;
+        *p = *matrix;
+        *matrix = tmp;
+        matrix++;
+        p--;
+    }
+
+    if (p == matrix)
+    {
+        reverse_array(*matrix);
+    }
+}
diff --git a/graphs/piscine/null_terminated_arrays/null_terminated_arrays.h b/graphs/piscine/null_terminated_arrays/null_terminated_arrays.h
new file mode 100644
index 0000000..31fccc5
--- /dev/null
+++ b/graphs/piscine/null_terminated_arrays/null_terminated_arrays.h
@@ -0,0 +1,6 @@
+#ifndef NULL_TERMINATED_ARRAYS_H_
+#define NULL_TERMINATED_ARRAYS_H_
+
+void reverse_matrix(const char ***matrix);
+
+#endif /* !NULL_TERMINATED_ARRAYS_H_ */
diff --git a/graphs/piscine/number_digits_rec/number_digits_rec.c b/graphs/piscine/number_digits_rec/number_digits_rec.c
new file mode 100644
index 0000000..94de296
--- /dev/null
+++ b/graphs/piscine/number_digits_rec/number_digits_rec.c
@@ -0,0 +1,8 @@
+unsigned int number_digits_rec(unsigned int n)
+{
+    if (n / 10 == 0)
+    {
+        return 1;
+    }
+    return 1 + number_digits_rec(n / 10);
+}
diff --git a/graphs/piscine/palindrome/palindrome.c b/graphs/piscine/palindrome/palindrome.c
new file mode 100644
index 0000000..2ecacfd
--- /dev/null
+++ b/graphs/piscine/palindrome/palindrome.c
@@ -0,0 +1,47 @@
+#include "palindrome.h"
+
+#include <stddef.h>
+
+int palindrome(const char *s)
+{
+    if (s == NULL)
+    {
+        return 0;
+    }
+
+    if (*s == '\0')
+    {
+        return 1;
+    }
+
+    const char *p = s;
+    while (*p)
+    {
+        p++;
+    }
+    p--;
+
+    while (p > s)
+    {
+        while ((*p < '0' || (*p > '9' && *p < 'A') || (*p > 'Z' && *p < 'a')
+                || *p > 'z')
+               && p > s)
+        {
+            p--;
+        }
+        while ((*s < '0' || (*s > '9' && *s < 'A') || (*s > 'Z' && *s < 'a')
+                || *s > 'z')
+               && p > s)
+        {
+            s++;
+        }
+        if (*p != *s)
+        {
+            return 0;
+        }
+        p--;
+        s++;
+    }
+
+    return 1;
+}
diff --git a/graphs/piscine/palindrome/palindrome.h b/graphs/piscine/palindrome/palindrome.h
new file mode 100644
index 0000000..8595911
--- /dev/null
+++ b/graphs/piscine/palindrome/palindrome.h
@@ -0,0 +1,6 @@
+#ifndef PALINDROME_H
+#define PALINDROME_H
+
+int palindrome(const char *s);
+
+#endif /* !PALINDROME_H */
diff --git a/graphs/piscine/pine/pine.c b/graphs/piscine/pine/pine.c
new file mode 100644
index 0000000..9d48761
--- /dev/null
+++ b/graphs/piscine/pine/pine.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+int pine(unsigned n)
+{
+    if (n < 3)
+    {
+        return 1;
+    }
+
+    for (unsigned i = 0; i < n; i++)
+    {
+        for (unsigned j = 0; j < n - i - 1; j++)
+        {
+            putchar(' ');
+        }
+
+        for (unsigned j = 0; j < 2 * i + 1; j++)
+        {
+            putchar('*');
+        }
+
+        putchar('\n');
+    }
+
+    for (unsigned i = 0; i < n / 2; i++)
+    {
+        for (unsigned j = 0; j < n - 1; j++)
+        {
+            putchar(' ');
+        }
+        putchar('*');
+        putchar('\n');
+    }
+
+    return 0;
+}
diff --git a/graphs/piscine/pointer_swap/pointer_swap.c b/graphs/piscine/pointer_swap/pointer_swap.c
new file mode 100644
index 0000000..32ceb84
--- /dev/null
+++ b/graphs/piscine/pointer_swap/pointer_swap.c
@@ -0,0 +1,6 @@
+void pointer_swap(int **a, int **b)
+{
+    int *tmp = *a;
+    *a = *b;
+    *b = tmp;
+}
diff --git a/graphs/piscine/prototypes/prototypes.sh b/graphs/piscine/prototypes/prototypes.sh
new file mode 100755
index 0000000..3c80468
--- /dev/null
+++ b/graphs/piscine/prototypes/prototypes.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+sed -En 's/^(([a-zA-Z]* ){0,2}([a-zA-Z]*) *\**([a-z][a-z0-9_]*)\((([a-zA-Z]* )?([a-zA-Z]* )?([a-z][a-z0-9_]* *)(\**[a-z][a-z0-9_]*|[a-z][a-z0-9_]*\[([0-9][0-9]*)?\])(, ([a-zA-Z]* )?([a-zA-Z]* )?([a-z][a-z0-9_]* *)(\**[a-z][a-z0-9_]*|[a-z][a-z0-9_]*\[([0-9][0-9]*)?\])){0,3}|void)\))$/\1;/p' "$1"
diff --git a/graphs/piscine/quick_sort/quick_sort.c b/graphs/piscine/quick_sort/quick_sort.c
new file mode 100644
index 0000000..6c61fc3
--- /dev/null
+++ b/graphs/piscine/quick_sort/quick_sort.c
@@ -0,0 +1,18 @@
+#include <stddef.h>
+
+void quicksort(int *tab, size_t len)
+{
+    if (tab == NULL)
+    {
+        return;
+    }
+    for (size_t i = 1; i < len; i++)
+    {
+        for (size_t j = i; j > 0 && tab[j - 1] > tab[j]; j--)
+        {
+            int tmp = tab[j];
+            tab[j] = tab[j - 1];
+            tab[j - 1] = tmp;
+        }
+    }
+}
diff --git a/graphs/piscine/quick_sort/quick_sort_example.c b/graphs/piscine/quick_sort/quick_sort_example.c
new file mode 100644
index 0000000..2a5228f
--- /dev/null
+++ b/graphs/piscine/quick_sort/quick_sort_example.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+void quicksort(int *tab, int len);
+
+int main(void)
+{
+    unsigned i = 0;
+    int tab[] = { 10, 11, 2, 3, 8, 5, 7, 6, 26, 30, 2, 1, 17, 13, 14 };
+
+    unsigned size = sizeof(tab) / sizeof(int);
+
+    quicksort(tab, size);
+
+    for (; i < size - 1; ++i)
+        printf("%d ", tab[i]);
+    printf("%d\n", tab[i]);
+
+    return 0;
+}
diff --git a/graphs/piscine/repeat/repeat.c b/graphs/piscine/repeat/repeat.c
new file mode 100644
index 0000000..06d0b43
--- /dev/null
+++ b/graphs/piscine/repeat/repeat.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+    if (argc != 3)
+        return 1;
+
+    for (int i = 0; i < argv[2][0] - '0'; i++)
+        puts(argv[1]);
+    return 0;
+}
diff --git a/graphs/piscine/right_tarball/my_tarball.tar.gz b/graphs/piscine/right_tarball/my_tarball.tar.gz
new file mode 100644
index 0000000..eb6acfc
--- /dev/null
+++ b/graphs/piscine/right_tarball/my_tarball.tar.gz
diff --git a/graphs/piscine/rotx/rotx.c b/graphs/piscine/rotx/rotx.c
new file mode 100644
index 0000000..a2cb820
--- /dev/null
+++ b/graphs/piscine/rotx/rotx.c
@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 10
+
+int main(int argc, char **argv)
+{
+    if (argc != 2)
+    {
+        return 0;
+    }
+
+    int rot = atoi(argv[1]);
+    int rod = rot;
+    if (rot < 0)
+    {
+        rot = (rot % 26) + 26;
+        rod = (rod % 10) + 10;
+    }
+
+    char buf[BUFFER_SIZE];
+    ssize_t r;
+
+    while ((r = read(STDIN_FILENO, buf, BUFFER_SIZE)))
+    {
+        if (r == -1)
+        {
+            return 1;
+        }
+
+        for (ssize_t i = 0; i < r; i++)
+        {
+            if (buf[i] >= 'a' && buf[i] <= 'z')
+            {
+                buf[i] = ((buf[i] - 'a') + rot) % 26 + 'a';
+            }
+            else if (buf[i] >= 'A' && buf[i] <= 'Z')
+            {
+                buf[i] = ((buf[i] - 'A') + rot) % 26 + 'A';
+            }
+            else if (buf[i] >= '0' && buf[i] <= '9')
+            {
+                buf[i] = ((buf[i] - '0') + rod) % 10 + '0';
+            }
+        }
+
+        ssize_t w = write(STDOUT_FILENO, buf, r);
+        while (w != r)
+        {
+            w += write(STDOUT_FILENO, buf, r);
+            if (w == -1)
+            {
+                return 1;
+            }
+        }
+    }
+
+    return 0;
+}
diff --git a/graphs/piscine/sed_trailing_whitespaces/whitespaces.sed b/graphs/piscine/sed_trailing_whitespaces/whitespaces.sed
new file mode 100644
index 0000000..46b7017
--- /dev/null
+++ b/graphs/piscine/sed_trailing_whitespaces/whitespaces.sed
@@ -0,0 +1 @@
+s/[ \t]*$//
diff --git a/graphs/piscine/selection_sort/selection_sort.c b/graphs/piscine/selection_sort/selection_sort.c
new file mode 100644
index 0000000..98adc7e
--- /dev/null
+++ b/graphs/piscine/selection_sort/selection_sort.c
@@ -0,0 +1,30 @@
+#include <stddef.h>
+
+void swap(int *a, int *b)
+{
+    int tmp = *a;
+    *a = *b;
+    *b = tmp;
+}
+
+unsigned array_min(const int arr[], unsigned start, unsigned size)
+{
+    unsigned min = start;
+    for (; start < size; start++)
+    {
+        if (arr[min] > arr[start])
+        {
+            min = start;
+        }
+    }
+    return min;
+}
+
+void selection_sort(int arr[], unsigned size)
+{
+    for (size_t i = 0; i < size; i++)
+    {
+        unsigned j = array_min(arr, i, size);
+        swap(&(arr[i]), &(arr[j]));
+    }
+}
diff --git a/graphs/piscine/seq/seq.sh b/graphs/piscine/seq/seq.sh
new file mode 100755
index 0000000..9721432
--- /dev/null
+++ b/graphs/piscine/seq/seq.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+if [ $# -ne 3 ]; then
+    echo "Usage: ./seq.sh FIRST INCREMENT LAST" 1>&2
+    exit 1
+fi
+
+if [ "$2" -eq 0 ]; then
+    exit 1
+fi
+
+if [ "$1" -eq "$3" ]; then
+    echo "$1"
+    exit 0
+fi
+
+if [ "$1" -lt "$3" ]; then
+    [ 0 -gt "$2" ] && exit 1
+    i="$1"
+    while [ "$3" -ge "$i" ]; do
+        echo "$i"
+        i=$(($i + $2))
+    done
+    exit 0
+fi
+
+[ "$2" -gt 0 ] && exit 1
+i="$1"
+while [ "$i" -ge "$3" ]; do
+    echo "$i"
+    i=$(($i + $2))
+done
+exit 0
diff --git a/graphs/piscine/sieve_eratosthenes_advanced/Makefile b/graphs/piscine/sieve_eratosthenes_advanced/Makefile
new file mode 100644
index 0000000..c7e35f9
--- /dev/null
+++ b/graphs/piscine/sieve_eratosthenes_advanced/Makefile
@@ -0,0 +1,13 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -Wextra -Werror -Wvla -pedantic
+LDLIBS=
+
+all: sieve.o
+
+sieve.o: sieve.c
+	$(CC) $(CFLAGS) -c -o sieve.o sieve.c
+
+.PHONY: clean
+
+clean:
+	rm sieve.o
diff --git a/graphs/piscine/sieve_eratosthenes_advanced/sieve.c b/graphs/piscine/sieve_eratosthenes_advanced/sieve.c
new file mode 100644
index 0000000..7dd4816
--- /dev/null
+++ b/graphs/piscine/sieve_eratosthenes_advanced/sieve.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void sieve(int n)
+{
+    if (n <= 2)
+    {
+        return;
+    }
+
+    // Generate array
+    int *a = calloc(n, sizeof(int));
+    int count = 0;
+
+    // Actual sieve and count
+    for (int i = 2; i < n; i++)
+    {
+        if (a[i] == 0)
+        {
+            for (int k = 2 * i; k < n; k += i)
+            {
+                a[k] = 1;
+            }
+        }
+    }
+
+    for (int i = 2; i < n; i++)
+    {
+        if (a[i] == 0)
+        {
+            count++;
+        }
+    }
+
+    // Print the count
+    printf("%d\n", count);
+
+    free(a);
+}
diff --git a/graphs/piscine/simple_fnmatch/simple_fnmatch.c b/graphs/piscine/simple_fnmatch/simple_fnmatch.c
new file mode 100644
index 0000000..d40353f
--- /dev/null
+++ b/graphs/piscine/simple_fnmatch/simple_fnmatch.c
@@ -0,0 +1,46 @@
+#include "simple_fnmatch.h"
+
+int simple_fnmatch(const char *pattern, const char *string)
+{
+    if (!pattern || !string)
+        return FNM_NOMATCH;
+    if (*pattern == '*' && pattern[1] == '\0')
+        return 0;
+    while (*pattern && *string)
+    {
+        if (*pattern == '?')
+        {
+            pattern++;
+            string++;
+        }
+        else if (*pattern == '\\')
+        {
+            pattern++;
+            if (!pattern || *pattern != *string)
+                return FNM_NOMATCH;
+            string++;
+            pattern++;
+        }
+        else if (*pattern == '*')
+        {
+            pattern++;
+            while (*string && simple_fnmatch(pattern, string))
+                string++;
+            if (*string)
+                return 0;
+        }
+        else if (*pattern != *string)
+            return FNM_NOMATCH;
+        else
+        {
+            string++;
+            pattern++;
+        }
+    }
+
+    if (*pattern == '*' && pattern[1] == '\0')
+        return 0;
+    if (*string || *pattern)
+        return FNM_NOMATCH;
+    return 0;
+}
diff --git a/graphs/piscine/simple_fnmatch/simple_fnmatch.h b/graphs/piscine/simple_fnmatch/simple_fnmatch.h
new file mode 100644
index 0000000..e1ae166
--- /dev/null
+++ b/graphs/piscine/simple_fnmatch/simple_fnmatch.h
@@ -0,0 +1,8 @@
+#ifndef SIMPLE_FNMATCH_H
+#define SIMPLE_FNMATCH_H
+
+#define FNM_NOMATCH 1
+
+int simple_fnmatch(const char *pattern, const char *string);
+
+#endif /* !SIMPLE_FNMATCH_H */
diff --git a/graphs/piscine/stack/stack.c b/graphs/piscine/stack/stack.c
new file mode 100644
index 0000000..0498abc
--- /dev/null
+++ b/graphs/piscine/stack/stack.c
@@ -0,0 +1,30 @@
+#include "stack.h"
+
+#include <stdlib.h>
+
+struct stack *stack_push(struct stack *s, int e)
+{
+    struct stack *new = malloc(sizeof(struct stack));
+    new->data = e;
+    new->next = NULL;
+
+    new->next = s;
+    return new;
+}
+
+struct stack *stack_pop(struct stack *s)
+{
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    struct stack *res = s->next;
+    free(s);
+    return res;
+}
+
+int stack_peek(struct stack *s)
+{
+    return s->data;
+}
diff --git a/graphs/piscine/stack/stack.h b/graphs/piscine/stack/stack.h
new file mode 100644
index 0000000..bd5dd24
--- /dev/null
+++ b/graphs/piscine/stack/stack.h
@@ -0,0 +1,14 @@
+#ifndef STACK_H
+#define STACK_H
+
+struct stack
+{
+    int data;
+    struct stack *next;
+};
+
+struct stack *stack_push(struct stack *s, int e);
+struct stack *stack_pop(struct stack *s);
+int stack_peek(struct stack *s);
+
+#endif /* !STACK_H */
diff --git a/graphs/piscine/str_revert/str_revert.c b/graphs/piscine/str_revert/str_revert.c
new file mode 100644
index 0000000..31f7f3d
--- /dev/null
+++ b/graphs/piscine/str_revert/str_revert.c
@@ -0,0 +1,25 @@
+#include "str_revert.h"
+
+#include <stddef.h>
+
+void str_revert(char str[])
+{
+    if (*str == '\0')
+    {
+        return;
+    }
+
+    size_t len = 0;
+    for (; str[len]; len++)
+    {
+        continue;
+    }
+    len--;
+
+    for (size_t i = 0; i <= len / 2; i++)
+    {
+        char tmp = str[i];
+        str[i] = str[len - i];
+        str[len - i] = tmp;
+    }
+}
diff --git a/graphs/piscine/str_revert/str_revert.h b/graphs/piscine/str_revert/str_revert.h
new file mode 100644
index 0000000..daa23d4
--- /dev/null
+++ b/graphs/piscine/str_revert/str_revert.h
@@ -0,0 +1,6 @@
+#ifndef STR_REVERT_H
+#define STR_REVERT_H
+
+void str_revert(char str[]);
+
+#endif /* ! STR_REVERT_H */
diff --git a/graphs/piscine/test.txt b/graphs/piscine/test.txt
new file mode 100644
index 0000000..958cdbc
--- /dev/null
+++ b/graphs/piscine/test.txt
@@ -0,0 +1,3 @@
+This is a short line.
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+This is another short line.
diff --git a/graphs/piscine/test_a_bit/is_set.c b/graphs/piscine/test_a_bit/is_set.c
new file mode 100644
index 0000000..38fccf8
--- /dev/null
+++ b/graphs/piscine/test_a_bit/is_set.c
@@ -0,0 +1,6 @@
+#include "is_set.h"
+
+unsigned int is_set(unsigned int value, unsigned char n)
+{
+    return (value & (1 << (n - 1))) != 0;
+}
diff --git a/graphs/piscine/test_a_bit/is_set.h b/graphs/piscine/test_a_bit/is_set.h
new file mode 100644
index 0000000..8f2fd9a
--- /dev/null
+++ b/graphs/piscine/test_a_bit/is_set.h
@@ -0,0 +1,6 @@
+#ifndef IS_SET_H
+#define IS_SET_H
+
+unsigned int is_set(unsigned int value, unsigned char n);
+
+#endif /* ! IS_SET_H */
diff --git a/graphs/piscine/test_a_bit/test.c b/graphs/piscine/test_a_bit/test.c
new file mode 100644
index 0000000..e3403e4
--- /dev/null
+++ b/graphs/piscine/test_a_bit/test.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+#include "is_set.h"
+
+int main(void)
+{
+    printf("%d\n", is_set(24, 4));
+    printf("%d\n", is_set(24, 3));
+
+    return 0;
+}
diff --git a/graphs/piscine/tinylibstream/Makefile b/graphs/piscine/tinylibstream/Makefile
new file mode 100644
index 0000000..b060495
--- /dev/null
+++ b/graphs/piscine/tinylibstream/Makefile
@@ -0,0 +1,13 @@
+CC = gcc
+CFLAGS = -std=c99 -pedantic -Werror -Wall -Wextra -Wvla
+
+.PHONY: library clean
+
+library: src/tinylibstream.o
+	ar csr libstream.a src/tinylibstream.o
+
+clean:
+	rm libstream.a src/tinylibstream.o
+
+check:
+	$(CC) $(CFLAGS) -lcriterion src/tinylibstream.c tests/tests.c
diff --git a/graphs/piscine/tinylibstream/include/libstream.h b/graphs/piscine/tinylibstream/include/libstream.h
new file mode 100644
index 0000000..459432d
--- /dev/null
+++ b/graphs/piscine/tinylibstream/include/libstream.h
@@ -0,0 +1,167 @@
+#ifndef LIBSTREAM_H
+#define LIBSTREAM_H
+
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <unistd.h>
+
+/*
+** /!\ DO NOT MODIFY THIS FILE, AS IT WILL BE OVERRIDDEN DURING CORRECTION. /!\
+**
+** You can add your own functions declarations to OTHER HEADER FILES.
+*/
+
+/* the value returned when end of file is reached */
+#define LBS_EOF (-1)
+
+/* the size of the buffer */
+#define LBS_BUFFER_SIZE 32
+
+/*
+** Describes the current operation:
+**  - if reading, the buffer contains read-buffered data
+**  - if writing, the buffer contains write-buffered data
+*/
+enum stream_io_operation
+{
+    STREAM_READING = 0,
+    STREAM_WRITING,
+};
+
+/*
+** Controls when to flush the buffer:
+**  - when unbuffered, flush every time a character is written
+**  - when buffered, flush when the buffer is full
+**  - when line buffered, flush when the buffer is full or when a \n
+**    character is written
+*/
+enum stream_buffering
+{
+    STREAM_UNBUFFERED = 0,
+    STREAM_LINE_BUFFERED,
+    STREAM_BUFFERED,
+};
+
+struct stream
+{
+    /* the flags passed to open */
+    int flags;
+
+    /*
+    ** Initially, this variable is 0.
+    ** When a function such as fgetc fails, it is set to 1 to indicate
+    ** something went wrong. This is useful to make the difference between
+    ** reaching the end of file and read errors while using fgetc and
+    ** some others.
+    ** It is often referred to as the error indicator.
+    */
+    int error;
+
+    /* the file descriptor, as returned by open(2) */
+    int fd;
+
+    /*
+    ** the kind of data stored by the buffer.
+    ** The default value shouldn't matter.
+    */
+    enum stream_io_operation io_operation;
+
+    /*
+    ** defines when to flush **output**.
+    ** This field does not control input buffering (which is always fully
+    ** buffered).
+    **
+    ** The default value is LINE_BUFFERED if isatty(fd), BUFFERED otherwise.
+    */
+    enum stream_buffering buffering_mode;
+
+    /* the amount of used bytes in the buffer */
+    size_t buffered_size;
+
+    /*
+    ** /!\ This field only makes sense when io_operation is STREAM_READING /!\
+    ** the amount of data already read from the buffer by the user.
+    */
+    size_t already_read;
+
+    /*
+    **                   buffer
+    **               -------------->
+    ** +==============+====================+---------------------+
+    ** | already_read | remaining_buffered | unused_buffer_space |
+    ** +==============+====================+---------------------+
+    **   \_______________________________/
+    **             buffered_size
+    **
+    ** /!\ The buffer can contain either read-buffered or write-buffered data,
+    **     depending on the value of io_operation /!\
+    */
+    char buffer[LBS_BUFFER_SIZE];
+};
+
+/*
+** These functions are defined in a header for optimization reasons:
+** each .c file that includes this header will get its own copy of the
+** function's code, thus easily make optimizations.
+**
+** ``static`` means each compilation unit (.c file) will have its own copy
+** of the function without them clashing.
+**
+** ``inline`` means the content of the function should be "copy pasted"
+** where it's called. It also tells the compiler not to complain when the
+** function isn't used.
+**
+** They're just like a macro, except the type of arguments is checked.
+*/
+
+static inline size_t stream_remaining_buffered(struct stream *stream)
+{
+    return stream->buffered_size - stream->already_read;
+}
+
+static inline size_t stream_unused_buffer_space(struct stream *stream)
+{
+    return sizeof(stream->buffer) - stream->buffered_size;
+}
+
+static inline bool stream_readable(struct stream *stream)
+{
+    int access_mode = stream->flags & O_ACCMODE;
+    if (access_mode == O_RDWR)
+        return true;
+    return access_mode == O_RDONLY;
+}
+
+static inline bool stream_writable(struct stream *stream)
+{
+    int access_mode = stream->flags & O_ACCMODE;
+    if (access_mode == O_RDWR)
+        return true;
+    return access_mode == O_WRONLY;
+}
+
+static inline int lbs_ferror(struct stream *stream)
+{
+    return stream->error;
+}
+
+static inline void lbs_clearerr(struct stream *stream)
+{
+    stream->error = 0;
+}
+
+static inline void lbs_setbufmode(struct stream *stream,
+                                  enum stream_buffering mode)
+{
+    stream->buffering_mode = mode;
+}
+
+struct stream *lbs_fopen(const char *path, const char *mode);
+struct stream *lbs_fdopen(int fd, const char *mode);
+int lbs_fflush(struct stream *stream);
+int lbs_fclose(struct stream *stream);
+int lbs_fputc(int c, struct stream *stream);
+int lbs_fgetc(struct stream *stream);
+
+#endif /* !LIBSTREAM_H */
diff --git a/graphs/piscine/tinylibstream/src/tinylibstream.c b/graphs/piscine/tinylibstream/src/tinylibstream.c
new file mode 100644
index 0000000..dca1c01
--- /dev/null
+++ b/graphs/piscine/tinylibstream/src/tinylibstream.c
@@ -0,0 +1,221 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "../include/libstream.h"
+
+int get_flags(const char *mode)
+{
+    int flags;
+    if (strcmp(mode, "r") == 0)
+    {
+        flags = O_RDONLY;
+    }
+    else if (strcmp(mode, "r+") == 0)
+    {
+        flags = O_RDWR;
+    }
+    else if (strcmp(mode, "w") == 0)
+    {
+        flags = O_WRONLY | O_TRUNC | O_CREAT;
+    }
+    else
+    {
+        flags = O_RDWR | O_TRUNC | O_CREAT;
+    }
+
+    return flags;
+}
+
+struct stream *lbs_fopen(const char *path, const char *mode)
+{
+    int fd = open(path, get_flags(mode));
+
+    return lbs_fdopen(fd, mode);
+}
+
+struct stream *lbs_fdopen(int fd, const char *mode)
+{
+    if (fd == -1)
+    {
+        return NULL;
+    }
+
+    struct stream *s = malloc(sizeof(struct stream));
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    s->flags = get_flags(mode);
+    s->error = 0;
+    s->fd = fd;
+    if (isatty(fd))
+    {
+        s->buffering_mode = STREAM_LINE_BUFFERED;
+    }
+    else
+    {
+        s->buffering_mode = STREAM_BUFFERED;
+    }
+    s->buffered_size = 0;
+    s->already_read = 0;
+
+    return s;
+}
+
+int lbs_fflush(struct stream *stream)
+{
+    if (stream == NULL || stream->buffered_size == 0)
+    {
+        return 0;
+    }
+
+    if (stream->io_operation == STREAM_READING)
+    {
+        if (!stream_readable(stream))
+        {
+            stream->error = 1;
+            return LBS_EOF;
+        }
+        if (stream_remaining_buffered(stream) != 0
+            && lseek(stream->fd, -stream_remaining_buffered(stream), SEEK_CUR)
+                == -1)
+        {
+            stream->error = 1;
+            return LBS_EOF;
+        }
+        stream->buffered_size = 0;
+        stream->already_read = 0;
+    }
+    else
+    {
+        if (!stream_writable(stream))
+        {
+            stream->error = 1;
+            return LBS_EOF;
+        }
+        ssize_t w;
+        if ((w = write(stream->fd, stream->buffer, stream->buffered_size))
+            == -1)
+        {
+            stream->error = 1;
+            return LBS_EOF;
+        }
+        stream->buffered_size = 0;
+        stream->already_read = 0;
+    }
+    return 0;
+}
+
+int lbs_fclose(struct stream *stream)
+{
+    if (stream == NULL)
+    {
+        return 1;
+    }
+
+    lbs_fflush(stream);
+    if (close(stream->fd) == -1)
+    {
+        return 1;
+    }
+
+    free(stream);
+
+    return 0;
+}
+
+int lbs_fputc(int c, struct stream *stream)
+{
+    if (!stream_writable(stream))
+    {
+        stream->error = 1;
+        return -1;
+    }
+
+    if (stream->io_operation == STREAM_READING)
+    {
+        if (lbs_fflush(stream) != 0)
+        {
+            return -1;
+        }
+        stream->buffered_size = 0;
+        stream->already_read = 0;
+    }
+    stream->io_operation = STREAM_WRITING;
+
+    if (stream_unused_buffer_space(stream) == 0
+        || stream->buffering_mode == STREAM_UNBUFFERED)
+    {
+        if (lbs_fflush(stream) != 0)
+        {
+            return -1;
+        }
+    }
+
+    stream->buffer[stream->buffered_size] = c;
+    stream->buffered_size++;
+    if (stream_unused_buffer_space(stream) == 0
+        || stream->buffering_mode == STREAM_UNBUFFERED
+        || (stream->buffering_mode == STREAM_LINE_BUFFERED && c == '\n'))
+    {
+        if (lbs_fflush(stream) != 0)
+        {
+            return -1;
+        }
+    }
+
+    return c;
+}
+
+int refill_buffer(struct stream *stream)
+{
+    stream->already_read = 0;
+    ssize_t r;
+    if ((r = read(stream->fd, stream->buffer, LBS_BUFFER_SIZE)) == -1)
+    {
+        stream->error = 1;
+        return -1;
+    }
+    if (r == 0)
+    {
+        return -1;
+    }
+    stream->buffered_size = r;
+    return r;
+}
+
+int lbs_fgetc(struct stream *stream)
+{
+    if (!stream_readable(stream))
+    {
+        stream->error = 1;
+        return -1;
+    }
+    if (stream->io_operation == STREAM_WRITING)
+    {
+        if (lbs_fflush(stream) != 0)
+        {
+            stream->error = 1;
+            return -1;
+        }
+        stream->already_read = 0;
+    }
+    stream->io_operation = STREAM_READING;
+
+    if (stream_remaining_buffered(stream) == 0)
+    {
+        int r;
+        if ((r = refill_buffer(stream)) == -1)
+        {
+            stream->error = 1;
+            return -1;
+        }
+    }
+
+    int res = stream->buffer[stream->already_read++];
+
+    unsigned char c = res;
+
+    return c;
+}
diff --git a/graphs/piscine/tinylibstream/stdin_buffering_test.c b/graphs/piscine/tinylibstream/stdin_buffering_test.c
new file mode 100644
index 0000000..6d3361b
--- /dev/null
+++ b/graphs/piscine/tinylibstream/stdin_buffering_test.c
@@ -0,0 +1,70 @@
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+struct slow_cookie
+{
+    int fd;
+};
+
+static ssize_t slow_read(void *vcookie, char *buf, size_t count)
+{
+    struct slow_cookie *cookie = vcookie;
+    usleep(500000); // sleep for half of a second
+
+    ssize_t res;
+
+    while ((res = read(cookie->fd, buf, count)) < 0)
+        if (errno != EINTR && errno != EAGAIN)
+            break;
+
+    return res;
+}
+
+static int slow_close(void *vcookie)
+{
+    struct slow_cookie *cookie = vcookie;
+    return close(cookie->fd);
+}
+
+cookie_io_functions_t slow_stdio = {
+    .read = slow_read,
+    .close = slow_close,
+};
+
+int main(void)
+{
+    /* setup a custom stdin stream with a slow read function */
+    struct slow_cookie cookie = {
+        .fd = STDIN_FILENO,
+    };
+
+    FILE *input_stream = fopencookie(&cookie, "r", slow_stdio);
+
+    /* change the buffer size to the one given by stdbuf.
+    ** it doesn't work out of the box as stdbuf only does
+    ** this for the already existing stdin stream.
+    */
+    char *buffer = NULL;
+    char *buffer_size = getenv("_STDBUF_I");
+    if (buffer_size)
+    {
+        size_t size = atoi(buffer_size);
+        buffer = malloc(size);
+        setvbuf(input_stream, buffer, _IOFBF, size);
+    }
+
+    /* forward all characters from stdin to stdout */
+    int c;
+    while ((c = fgetc(input_stream)) != EOF)
+    {
+        fputc(c, stdout);
+        fflush(stdout);
+    }
+
+    fclose(input_stream);
+    free(buffer);
+    return 0;
+}
diff --git a/graphs/piscine/tinylibstream/stdout_buffering_test.c b/graphs/piscine/tinylibstream/stdout_buffering_test.c
new file mode 100644
index 0000000..45c0a83
--- /dev/null
+++ b/graphs/piscine/tinylibstream/stdout_buffering_test.c
@@ -0,0 +1,13 @@
+#define _XOPEN_SOURCE 500
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+    const char test_string[] = "Robin\nloves\nBatman\n";
+    for (size_t i = 0; test_string[i]; i++)
+    {
+        usleep(100000); // wait a tenth of a second
+        putchar(test_string[i]);
+    }
+}
diff --git a/graphs/piscine/tinyprintf/Makefile b/graphs/piscine/tinyprintf/Makefile
new file mode 100644
index 0000000..6a07d90
--- /dev/null
+++ b/graphs/piscine/tinyprintf/Makefile
@@ -0,0 +1,17 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -Wextra -Werror -Wvla -pedantic
+LDLIBS=-lcriterion
+
+all: src/tinyprintf.o
+
+check: src/tinyprintf.o
+	$(CC) $(CFLAGS) -o tinytests src/tinyprintf.o tests/tests.c $(LDLIBS)
+	./tinytests
+
+src/tinyprintf.o: src/tinyprintf.c
+	$(CC) $(CFLAGS) -c -o src/tinyprintf.o src/tinyprintf.c
+
+.PHONY: clean
+
+clean:
+	rm src/tinyprintf.o tinytests
diff --git a/graphs/piscine/tinyprintf/src/tinyprintf.c b/graphs/piscine/tinyprintf/src/tinyprintf.c
new file mode 100644
index 0000000..d005db7
--- /dev/null
+++ b/graphs/piscine/tinyprintf/src/tinyprintf.c
@@ -0,0 +1,251 @@
+#include "tinyprintf.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int tinyprintf(const char *format, ...)
+{
+    if (format == NULL || *format == '\0')
+    {
+        return 0;
+    }
+
+    va_list ap;
+    va_start(ap, format);
+    int res = 0;
+
+    size_t i = 0;
+    while (format[i])
+    {
+        if (format[i] != '%')
+        {
+            putchar(format[i]);
+            res++;
+        }
+        else
+        {
+            dispatch(format[i + 1], ap, &res);
+            format++;
+        }
+        format++;
+    }
+    va_end(ap);
+    return res;
+}
+
+void dispatch(char c, va_list ap, int *res)
+{
+    switch (c)
+    {
+    case '%':
+        putchar('%');
+        (*res)++;
+        break;
+    case 'd':
+        handle_d(va_arg(ap, int), res);
+        break;
+    case 'u':
+        handle_u(va_arg(ap, unsigned int), res);
+        break;
+    case 'x':
+        handle_x(va_arg(ap, unsigned int), res);
+        break;
+    case 'o':
+        handle_o(va_arg(ap, unsigned int), res);
+        break;
+    case 'c':
+        putchar(va_arg(ap, int));
+        (*res)++;
+        break;
+    case 's':
+        handle_s(va_arg(ap, char *), res);
+        break;
+    default:
+        putchar('%');
+        putchar(c);
+        *res += 2;
+        break;
+    }
+}
+
+void handle_d(int val, int *res)
+{
+    if (val < 0)
+    {
+        putchar('-');
+        (*res)++;
+        val = -val;
+    }
+
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 10 + '0';
+        val /= 10;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_s(char *s, int *res)
+{
+    if (s == NULL)
+    {
+        char *text = "(null)";
+        for (; *text; text++)
+        {
+            putchar(*text);
+            (*res)++;
+        }
+        return;
+    }
+    for (; *s; s++)
+    {
+        putchar(*s);
+        (*res)++;
+    }
+}
+
+void handle_u(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 10 + '0';
+        val /= 10;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_x(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 16;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 16 + '0';
+        if (s[n] > '9')
+        {
+            s[n] = (s[n] - '0') % 10 + 'a';
+        }
+        val /= 16;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
+
+void handle_o(unsigned int val, int *res)
+{
+    if (val == 0)
+    {
+        putchar('0');
+        (*res)++;
+    }
+
+    unsigned int t = val;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 8;
+        n++;
+    }
+
+    char *s = malloc(n * sizeof(char));
+    int m = n;
+    if (s == NULL)
+    {
+        return;
+    }
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = val % 8 + '0';
+        val /= 8;
+    }
+
+    // actual printing
+    for (int i = 0; i < m; i++)
+    {
+        putchar(s[i]);
+        (*res)++;
+    }
+    free(s);
+}
diff --git a/graphs/piscine/tinyprintf/src/tinyprintf.h b/graphs/piscine/tinyprintf/src/tinyprintf.h
new file mode 100644
index 0000000..fd1f0b4
--- /dev/null
+++ b/graphs/piscine/tinyprintf/src/tinyprintf.h
@@ -0,0 +1,15 @@
+#ifndef TINYPRINTF_H
+#define TINYPRINTF_H
+
+#include <stdarg.h>
+#include <stddef.h>
+
+int tinyprintf(const char *format, ...);
+void handle_d(int val, int *res);
+void handle_u(unsigned int val, int *res);
+void handle_x(unsigned int val, int *res);
+void handle_o(unsigned int val, int *res);
+void handle_s(char *s, int *res);
+void dispatch(char c, va_list ap, int *res);
+
+#endif /* ! TINYPRINTF_H */
diff --git a/graphs/piscine/tinyprintf/tests/tests.c b/graphs/piscine/tinyprintf/tests/tests.c
new file mode 100644
index 0000000..4235203
--- /dev/null
+++ b/graphs/piscine/tinyprintf/tests/tests.c
@@ -0,0 +1,213 @@
+#include <criterion/criterion.h>
+#include <criterion/assert.h>
+#include <criterion/redirect.h>
+#include <stdio.h>
+
+#include "../src/tinyprintf.h"
+
+TestSuite(TestHandleD);
+
+Test(TestHandleD, handle_d42, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_d(42, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("42");
+    cr_expect(res == 2, "Expected: %d. Got: %d", 2, res);
+}
+
+Test(TestHandleD, handle_d0, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_d(0, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("0");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleD, handle_dminus42, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_d(-42, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("-42");
+    cr_expect(res == 3, "Expected: %d. Got: %d", 3, res);
+}
+
+Test(TestHandleD, simple_print, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%s [%d] %s", "Hello", 42, "world!");
+    fflush(stdout);
+    cr_assert_stdout_eq_str("Hello [42] world!");
+    cr_expect(retval == 17, "Expected: %d. Got: %d", 17, retval);
+}
+
+TestSuite(TestHandleX);
+
+Test(TestHandleX, handle_x42, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_x(42, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("2a");
+    cr_expect(res == 2, "Expected: %d. Got: %d", 2, res);
+}
+
+Test(TestHandleX, handle_x0, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_x(0, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("0");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleX, handle_x15, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_x(15, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("f");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleX, handle_0xdeadc0de, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_x(0xdeadc0de, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("deadc0de");
+    cr_expect(res == 8, "Expected: %d. Got: %d", 8, res);
+}
+
+Test(TestHandleX, simple_print_hexa, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%s [%x] %s", "Hello", 42, "world!");
+    fflush(stdout);
+    cr_assert_stdout_eq_str("Hello [2a] world!");
+    cr_expect(retval == 17, "Expected: %d. Got: %d", 17, retval);
+}
+
+TestSuite(TestHandleU);
+
+Test(TestHandleU, handle_u42, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_u(42, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("42");
+    cr_expect(res == 2, "Expected: %d. Got: %d", 2, res);
+}
+
+Test(TestHandleU, handle_u0, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_u(0, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("0");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleU, handle_u15, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_u(15, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("15");
+    cr_expect(res == 2, "Expected: %d. Got: %d", 2, res);
+}
+
+Test(TestHandleU, simple_print_unsigned, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%s [%u] %s", "Hello", 42, "world!");
+    fflush(stdout);
+    cr_assert_stdout_eq_str("Hello [42] world!");
+    cr_expect(retval == 17, "Expected: %d. Got: %d", 17, retval);
+}
+
+TestSuite(TestHandleO);
+
+Test(TestHandleO, handle_o42, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_o(42, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("52");
+    cr_expect(res == 2, "Expected: %d. Got: %d", 2, res);
+}
+
+Test(TestHandleO, handle_o0, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_o(0, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("0");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleO, handle_o7, .init = cr_redirect_stdout)
+{
+    int res = 0;
+    handle_o(7, &res);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("7");
+    cr_expect(res == 1, "Expected: %d. Got: %d", 1, res);
+}
+
+Test(TestHandleO, simple_print_octal, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%s [%o] %s", "Hello", 42, "world!");
+    fflush(stdout);
+    cr_assert_stdout_eq_str("Hello [52] world!");
+    cr_expect(retval == 17, "Expected: %d. Got: %d", 17, retval);
+}
+
+TestSuite(TestPrint);
+
+Test(TestPrint, print_percent, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%%s", "in your head");
+    fflush(stdout);
+    cr_assert_stdout_eq_str("%s");
+    cr_expect(retval == 2, "Expected: %d. Got: %d", 2, retval);
+}
+
+Test(TestPrint, print_unknown_option, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("Good morning ACU! %t Tinyprintf is cool", 12);
+    fflush(stdout);
+    cr_assert_stdout_eq_str("Good morning ACU! %t Tinyprintf is cool");
+    cr_expect(retval == 39, "Expected: %d. Got: %d", 39, retval);
+}
+
+Test(TestPrint, print_tricky, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%c%c is %s... %d too.", '4', '2', "the answer", '*');
+    fflush(stdout);
+    cr_assert_stdout_eq_str("42 is the answer... 42 too.");
+    cr_expect(retval == 27, "Expected: %d. Got: %d", 27, retval);
+}
+
+Test(TestPrint, print_null, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("%c%c is %s... %d too.", '4', '2', NULL, '*');
+    fflush(stdout);
+    cr_assert_stdout_eq_str("42 is (null)... 42 too.");
+    cr_expect(retval == 23, "Expected: %d. Got: %d", 23, retval);
+}
+
+Test(TestPrint, print_null_fmt, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf(NULL, '4', '2', NULL, '*');
+    fflush(stdout);
+    cr_assert_stdout_eq_str("");
+    cr_expect(retval == 0, "Expected: %d. Got: %d", 0, retval);
+}
+
+Test(TestPrint, print_empty_fmt, .init = cr_redirect_stdout)
+{
+    int retval = tinyprintf("", '4', '2', NULL, '*');
+    fflush(stdout);
+    cr_assert_stdout_eq_str("");
+    cr_expect(retval == 0, "Expected: %d. Got: %d", 0, retval);
+}
diff --git a/graphs/piscine/traffic_lights/traffic_lights.c b/graphs/piscine/traffic_lights/traffic_lights.c
new file mode 100644
index 0000000..76ea94f
--- /dev/null
+++ b/graphs/piscine/traffic_lights/traffic_lights.c
@@ -0,0 +1,38 @@
+#include "traffic_lights.h"
+
+void init(unsigned char *lights)
+{
+    *lights <<= 4;
+}
+
+void turn_on(unsigned char *lights, unsigned char light_num)
+{
+    *lights |= 1 << (light_num - 1);
+}
+
+void turn_off(unsigned char *lights, unsigned char light_num)
+{
+    *lights &= ~(1 << (light_num - 1));
+}
+
+void next_step(unsigned char *lights)
+{
+    *lights <<= 1;
+    *lights += *lights >> 4;
+}
+
+void reverse(unsigned char *lights)
+{
+    *lights = ~*lights;
+}
+
+void swap(unsigned char *lights_1, unsigned char *lights_2)
+{
+    if (lights_1 == lights_2)
+    {
+        return;
+    }
+    *lights_1 = *lights_2 ^ *lights_1;
+    *lights_2 = *lights_1 ^ *lights_2;
+    *lights_1 = *lights_2 ^ *lights_1;
+}
diff --git a/graphs/piscine/traffic_lights/traffic_lights.h b/graphs/piscine/traffic_lights/traffic_lights.h
new file mode 100644
index 0000000..7c803ea
--- /dev/null
+++ b/graphs/piscine/traffic_lights/traffic_lights.h
@@ -0,0 +1,11 @@
+#ifndef TRAFFIC_LIGHTS_H
+#define TRAFFIC_LIGHTS_H
+
+void init(unsigned char *lights);
+void turn_on(unsigned char *lights, unsigned char light_num);
+void turn_off(unsigned char *lights, unsigned char light_num);
+void next_step(unsigned char *lights);
+void reverse(unsigned char *lights);
+void swap(unsigned char *lights_1, unsigned char *lights_2);
+
+#endif /* !TRAFFIC_LIGHTS_H */
diff --git a/graphs/piscine/user_ids/get_ids.sh b/graphs/piscine/user_ids/get_ids.sh
new file mode 100644
index 0000000..2a1668b
--- /dev/null
+++ b/graphs/piscine/user_ids/get_ids.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cut --delimiter=: --fields=3 -s /etc/passwd | sort -rgu
diff --git a/graphs/piscine/using_special_variables/print.sh b/graphs/piscine/using_special_variables/print.sh
new file mode 100755
index 0000000..c24bebd
--- /dev/null
+++ b/graphs/piscine/using_special_variables/print.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+echo $#
+echo $*
+echo $1
+echo $2
+echo $3
+echo ${13}
+echo $0
diff --git a/graphs/piscine/variant/variant.c b/graphs/piscine/variant/variant.c
new file mode 100644
index 0000000..eb2f8a8
--- /dev/null
+++ b/graphs/piscine/variant/variant.c
@@ -0,0 +1,96 @@
+#include "variant.h"
+
+#include <stdio.h>
+#include <string.h>
+
+void variant_display(const struct variant *e)
+{
+    switch (e->type)
+    {
+    case (TYPE_INT):
+        printf("%d\n", e->value.int_v);
+        break;
+    case (TYPE_FLOAT):
+        printf("%f\n", e->value.float_v);
+        break;
+    case (TYPE_CHAR):
+        printf("%c\n", e->value.char_v);
+        break;
+    default:
+        printf("%s\n", e->value.str_v);
+        break;
+    }
+}
+
+bool variant_equal(const struct variant *left, const struct variant *right)
+{
+    if (left == NULL || right == NULL)
+    {
+        return true;
+    }
+    switch (left->type)
+    {
+    case (TYPE_INT):
+        if (right->type != TYPE_INT)
+        {
+            return false;
+        }
+        return left->value.int_v == right->value.int_v;
+    case (TYPE_FLOAT):
+        if (right->type != TYPE_FLOAT)
+        {
+            return false;
+        }
+        return left->value.float_v == right->value.float_v;
+    case (TYPE_CHAR):
+        if (right->type != TYPE_CHAR)
+        {
+            return false;
+        }
+        return left->value.char_v == right->value.char_v;
+    default:
+        if (right->type != TYPE_STRING)
+        {
+            return false;
+        }
+        return strcmp(left->value.str_v, right->value.str_v) == 0;
+    }
+}
+
+int variant_find(const struct variant *array, size_t len, enum type type,
+                 union type_any value)
+{
+    size_t i;
+    struct variant cmp = { type, value };
+    for (i = 0; i < len && variant_equal(array + i, &cmp) == false; i++)
+    {
+        continue;
+    }
+
+    if (i == len)
+    {
+        return -1;
+    }
+    return i;
+}
+
+float variant_sum(const struct variant *array, size_t len)
+{
+    if (array == NULL)
+    {
+        return 0;
+    }
+    float sum = 0;
+    for (size_t i = 0; i < len; i++)
+    {
+        if (array[i].type == TYPE_FLOAT)
+        {
+            sum += array[i].value.float_v;
+        }
+        else if (array[i].type == TYPE_INT)
+        {
+            sum += array[i].value.int_v;
+        }
+    }
+    return sum;
+}
diff --git a/graphs/piscine/variant/variant.h b/graphs/piscine/variant/variant.h
new file mode 100644
index 0000000..9983bc1
--- /dev/null
+++ b/graphs/piscine/variant/variant.h
@@ -0,0 +1,35 @@
+#ifndef VARIANT_H
+#define VARIANT_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+enum type
+{
+    TYPE_INT,
+    TYPE_FLOAT,
+    TYPE_CHAR,
+    TYPE_STRING
+};
+
+union type_any
+{
+    int int_v;
+    float float_v;
+    char char_v;
+    const char *str_v;
+};
+
+struct variant
+{
+    enum type type;
+    union type_any value;
+};
+
+void variant_display(const struct variant *e);
+bool variant_equal(const struct variant *left, const struct variant *right);
+int variant_find(const struct variant *array, size_t len, enum type type,
+                 union type_any value);
+float variant_sum(const struct variant *array, size_t len);
+
+#endif /* !VARIANT_H */
diff --git a/graphs/piscine/vector/Makefile b/graphs/piscine/vector/Makefile
new file mode 100644
index 0000000..744241f
--- /dev/null
+++ b/graphs/piscine/vector/Makefile
@@ -0,0 +1,13 @@
+CC = gcc
+CFLAGS = -Wall -Werror -Wvla -Wextra -std=c99 -pedantic
+
+.PHONY: library clean
+
+library: vector.o
+	ar csr libvector.a vector.o
+
+vector.o: vector.c
+	$(CC) $(CFLAGS) -c -o vector.o vector.c
+
+clean:
+	$(RM) libvector.a vector.o
diff --git a/graphs/piscine/vector/vector.c b/graphs/piscine/vector/vector.c
new file mode 100644
index 0000000..cbd19aa
--- /dev/null
+++ b/graphs/piscine/vector/vector.c
@@ -0,0 +1,152 @@
+#include "vector.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct vector *vector_init(size_t n)
+{
+    struct vector *res = malloc(sizeof(struct vector));
+    if (res == NULL)
+    {
+        return NULL;
+    }
+
+    res->size = 0;
+    res->capacity = n;
+    res->data = malloc(n * sizeof(int));
+    if (res->data == NULL)
+    {
+        return NULL;
+    }
+    return res;
+}
+
+void vector_destroy(struct vector *v)
+{
+    if (v)
+    {
+        free(v->data);
+        free(v);
+    }
+}
+
+struct vector *vector_resize(struct vector *v, size_t n)
+{
+    if (!v)
+    {
+        return NULL;
+    }
+    if (n == v->capacity)
+    {
+        return v;
+    }
+    if (v)
+    {
+        int *tmp = realloc(v->data, n * sizeof(int));
+        if (tmp == NULL)
+        {
+            return NULL;
+        }
+        v->data = tmp;
+
+        if (n < v->size)
+        {
+            v->size = n;
+        }
+        v->capacity = n;
+        return v;
+    }
+    return NULL;
+}
+
+struct vector *vector_append(struct vector *v, int elt)
+{
+    if (v == NULL)
+    {
+        return NULL;
+    }
+
+    if (v->size == v->capacity)
+    {
+        if (vector_resize(v, v->capacity * 2) == NULL)
+        {
+            return NULL;
+        }
+    }
+    v->data[v->size] = elt;
+    v->size++;
+    return v;
+}
+
+void vector_print(const struct vector *v)
+{
+    if (v == NULL || v->size == 0)
+    {
+        printf("\n");
+        return;
+    }
+    for (size_t i = 0; i < v->size - 1; i++)
+    {
+        printf("%d,", v->data[i]);
+    }
+    printf("%d\n", v->data[v->size - 1]);
+}
+
+struct vector *vector_reset(struct vector *v, size_t n)
+{
+    if (vector_resize(v, n) == NULL)
+    {
+        return NULL;
+    }
+
+    v->size = 0;
+    return v;
+}
+
+struct vector *vector_insert(struct vector *v, size_t i, int elt)
+{
+    if (v == NULL || i > v->size)
+        return NULL;
+    if (i == v->size)
+    {
+        return vector_append(v, elt);
+    }
+    if (v->size == v->capacity)
+    {
+        if (vector_resize(v, v->capacity * 2) == NULL)
+        {
+            return NULL;
+        }
+    }
+    for (size_t j = v->size; j > i; j--)
+    {
+        v->data[j] = v->data[j - 1];
+    }
+    v->size++;
+
+    v->data[i] = elt;
+    return v;
+}
+
+struct vector *vector_remove(struct vector *v, size_t i)
+{
+    if (v == NULL || v->size == 0 || i >= v->size)
+    {
+        return NULL;
+    }
+    for (size_t j = i; j < v->size - 1; j++)
+    {
+        v->data[j] = v->data[j + 1];
+    }
+
+    v->size--;
+
+    if (v->size < v->capacity / 2)
+    {
+        if (vector_resize(v, v->capacity / 2) == NULL)
+        {
+            return NULL;
+        }
+    }
+    return v;
+}
diff --git a/graphs/piscine/vector/vector.h b/graphs/piscine/vector/vector.h
new file mode 100644
index 0000000..5afada7
--- /dev/null
+++ b/graphs/piscine/vector/vector.h
@@ -0,0 +1,64 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include <stddef.h>
+
+struct vector
+{
+    // The number of elements in the vector
+    size_t size;
+    // The maximum number of elements in the vector
+    size_t capacity;
+    // The elements themselves
+    int *data;
+};
+
+/*
+** Initialize the vector with `n` capacity.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_init(size_t n);
+
+/*
+** Release the memory used by the vector.
+** Does nothing if `v` is `NULL`.
+*/
+void vector_destroy(struct vector *v);
+
+/*
+** Resize the vector to `n` capacity.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_resize(struct vector *v, size_t n);
+
+/*
+** Append an element to the end of the vector. Expand the vector if needed.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_append(struct vector *v, int elt);
+
+/*
+** Display the vector contents on `stdout`.
+** Displays `\n` if `v` is `NULL`.
+*/
+void vector_print(const struct vector *v);
+
+/*
+** Remove all the elements of the vector, and resize it to `n` capacity.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_reset(struct vector *v, size_t n);
+
+/*
+** Insert `n` at the index `i`. Expand the vector if needed.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_insert(struct vector *v, size_t i, int elt);
+
+/*
+** Remove the element at the index `i`.
+** Returns `NULL` if an error occured.
+*/
+struct vector *vector_remove(struct vector *v, size_t i);
+
+#endif /* !VECTOR_H */
diff --git a/graphs/sql/a_new_dawn/req01.sql b/graphs/sql/a_new_dawn/req01.sql
new file mode 100644
index 0000000..78015ec
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req01.sql
@@ -0,0 +1,66 @@
+CREATE SCHEMA nexus;
+CREATE SCHEMA nexus_it;
+CREATE SCHEMA techwave;
+CREATE SCHEMA nexus_food;
+CREATE SCHEMA guardforce;
+CREATE TYPE nexus.position AS ENUM (
+    'JUNIOR',
+    'SENIOR',
+    'MANAGER',
+    'DIRECTOR'
+);
+CREATE TYPE nexus.relationship_type AS ENUM (
+    'PARENT',
+    'SUBSIDIARY',
+    'AFFILIATE'
+);
+CREATE TYPE nexus_food.nutriscore AS ENUM (
+    'A',
+    'B',
+    'C',
+    'D',
+    'E'
+);
+CREATE TABLE nexus.employees
+(
+    id SERIAL PRIMARY KEY,
+    first_name VARCHAR(25),
+    last_name VARCHAR(25),
+    employee_position nexus.position,
+    salary NUMERIC(10, 2)
+);
+CREATE TABLE nexus.nexus_relations
+(
+    id SERIAL PRIMARY KEY,
+    parent_company VARCHAR(25),
+    child_company VARCHAR(25),
+    relationship_type nexus.relationship_type
+);
+CREATE TABLE nexus_it.software_assets
+(
+    id SERIAL PRIMARY KEY,
+    software_name VARCHAR(50),
+    license_key UUID,
+    expiration_date DATE
+);
+CREATE TABLE techwave.project_milestones
+(
+    id SERIAL PRIMARY KEY,
+    milestone_name VARCHAR(50),
+    due_date DATE,
+    completion_status BOOLEAN
+);
+CREATE TABLE nexus_food.products
+(
+    id SERIAL PRIMARY KEY,
+    product_name VARCHAR(25),
+    product_nutriscore nexus_food.nutriscore
+);
+CREATE TABLE guardforce.incident_reports
+(
+    id SERIAL PRIMARY KEY,
+    incident_description TEXT,
+    incident_date TIMESTAMP,
+    incident_location VARCHAR(50),
+    reported_by VARCHAR(50)
+);
diff --git a/graphs/sql/a_new_dawn/req02.sql b/graphs/sql/a_new_dawn/req02.sql
new file mode 100644
index 0000000..6c705da
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req02.sql
@@ -0,0 +1,8 @@
+ALTER TABLE nexus.employees
+ADD email VARCHAR(50);
+ALTER TABLE nexus_it.software_assets
+DROP IF EXISTS license_key;
+ALTER TABLE nexus_food.products
+RENAME COLUMN product_name TO product_title;
+ALTER TABLE nexus.employees
+ALTER COLUMN salary TYPE INTEGER;
diff --git a/graphs/sql/a_new_dawn/req03.sql b/graphs/sql/a_new_dawn/req03.sql
new file mode 100644
index 0000000..ef8c903
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req03.sql
@@ -0,0 +1,6 @@
+DROP TABLE nexus.employees;
+DROP TABLE nexus.nexus_relations;
+DROP TABLE nexus_it.software_assets;
+DROP TABLE techwave.project_milestones;
+DROP TABLE nexus_food.products;
+DROP TABLE guardforce.incident_reports;
diff --git a/graphs/sql/a_new_dawn/req04.sql b/graphs/sql/a_new_dawn/req04.sql
new file mode 100644
index 0000000..e3eb7cf
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req04.sql
@@ -0,0 +1,3 @@
+DROP TYPE nexus.position;
+DROP TYPE nexus.relationship_type;
+DROP TYPE nexus_food.nutriscore;
diff --git a/graphs/sql/a_new_dawn/req05.sql b/graphs/sql/a_new_dawn/req05.sql
new file mode 100644
index 0000000..d99e6e8
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req05.sql
@@ -0,0 +1,5 @@
+DROP SCHEMA nexus;
+DROP SCHEMA nexus_it;
+DROP SCHEMA techwave;
+DROP SCHEMA nexus_food;
+DROP SCHEMA guardforce;
diff --git a/graphs/sql/a_new_dawn/req06.sql b/graphs/sql/a_new_dawn/req06.sql
new file mode 100644
index 0000000..87eb6e3
--- /dev/null
+++ b/graphs/sql/a_new_dawn/req06.sql
@@ -0,0 +1,5 @@
+DROP SCHEMA IF EXISTS nexus CASCADE;
+DROP SCHEMA IF EXISTS nexus_it CASCADE;
+DROP SCHEMA IF EXISTS nexus_food CASCADE;
+DROP SCHEMA IF EXISTS techwave CASCADE;
+DROP SCHEMA IF EXISTS guardforce CASCADE;
diff --git a/graphs/sql/battle_plan/req01.sql b/graphs/sql/battle_plan/req01.sql
new file mode 100644
index 0000000..8adb788
--- /dev/null
+++ b/graphs/sql/battle_plan/req01.sql
@@ -0,0 +1,19 @@
+EXPLAIN (ANALYZE, COSTS, BUFFERS, VERBOSE, FORMAT YAML)
+WITH RECURSIVE fib AS (
+    SELECT
+        1 AS n,
+        1::bigint AS fibn,
+        1::bigint AS fibn_1
+    UNION ALL
+    SELECT
+        n + 1 AS n,
+        fibn_1 AS fibn,
+        fibn + fibn_1 AS fibn_1
+    FROM fib
+    WHERE n < 80
+)
+
+SELECT
+    n,
+    fibn
+FROM fib;
diff --git a/graphs/sql/battle_plan/req02.sql b/graphs/sql/battle_plan/req02.sql
new file mode 100644
index 0000000..a9d8e9b
--- /dev/null
+++ b/graphs/sql/battle_plan/req02.sql
@@ -0,0 +1,8 @@
+SELECT *
+FROM (
+    VALUES
+    ('a', 2),
+    ('b', 3),
+    ('b', 4),
+    ('c', 1)
+) AS answers(question, choice);
diff --git a/graphs/sql/battle_plan/req03.sql b/graphs/sql/battle_plan/req03.sql
new file mode 100644
index 0000000..5a3ba51
--- /dev/null
+++ b/graphs/sql/battle_plan/req03.sql
@@ -0,0 +1,17 @@
+SELECT
+    people.first_name,
+    people.last_name,
+    gusto_tables.number_of_seats AS guest_number,
+    round(reservations.bill_total::numeric, 2) AS bill_total
+FROM gusto_reservations AS reservations,
+    gusto_tables,
+    gusto_guests AS guests,
+    people
+WHERE reservations.table_id = gusto_tables.id
+    AND reservations.id = guests.reservation_id
+    AND reservations.cancelled = FALSE
+    AND guests.guest_id = people.id
+    AND people.last_name LIKE concat(reservations.reservation_name, '%')
+ORDER BY
+    gusto_tables.number_of_seats ASC, reservations.bill_total DESC NULLS LAST
+LIMIT 10;
diff --git a/graphs/sql/battle_plan/req04.sql b/graphs/sql/battle_plan/req04.sql
new file mode 100644
index 0000000..33988c6
--- /dev/null
+++ b/graphs/sql/battle_plan/req04.sql
@@ -0,0 +1,8 @@
+SELECT *
+FROM (
+    VALUES
+    ('a', 1),
+    ('b', 1),
+    ('b', 3),
+    ('c', 1)
+) AS answers(question, choice);
diff --git a/graphs/sql/corrupted_friends/req01.sql b/graphs/sql/corrupted_friends/req01.sql
new file mode 100644
index 0000000..bc759f7
--- /dev/null
+++ b/graphs/sql/corrupted_friends/req01.sql
@@ -0,0 +1,18 @@
+CREATE TYPE public.prefix AS ENUM (
+    'MRS',
+    'MS',
+    'MR',
+    'DR'
+);
+
+CREATE TABLE dtf.madelines_contacts
+(
+    id INTEGER PRIMARY KEY,
+    title public.prefix,
+    first_name TEXT,
+    last_name TEXT,
+    phone TEXT,
+    email TEXT,
+    favorite BOOLEAN,
+    created_at TIMESTAMP
+);
diff --git a/graphs/sql/corrupted_friends/req02.sql b/graphs/sql/corrupted_friends/req02.sql
new file mode 100644
index 0000000..11f9947
--- /dev/null
+++ b/graphs/sql/corrupted_friends/req02.sql
@@ -0,0 +1,41 @@
+INSERT INTO dtf.madelines_contacts
+SELECT
+id,
+upper(split_part(regexp_replace(trim(full_name), '([^[[:ascii:]]]*)|([[:digit:]]*)', '', 'g'), ' ', 1))::public.prefix AS title,
+initcap(split_part(regexp_replace(trim(full_name), '([^[[:ascii:]]]*)|([[:digit:]]*)', '', 'g'), ' ', 2)) AS first_name,
+initcap(split_part(regexp_replace(trim(full_name), '([^[[:ascii:]]]*)|([[:digit:]]*)', '', 'g'), ' ', 3)) AS last_name,
+concat(
+    lpad(
+        regexp_replace(
+            regexp_replace(phone, '[^0-9\.\-]', '', 'g'),
+            '(.?.?.?)[\.\-].*',
+            '\1',
+            'g'
+        ),
+        3, '0'
+    ),
+    '.',
+    lpad(
+        regexp_replace(
+            regexp_replace(phone, '[^0-9\.\-]', '', 'g'),
+            '.*[\.\-](.?.?.?)[\.\-].*',
+            '\1',
+            'g'
+        ),
+        3, '0'
+    ),
+    '.',
+    lpad(
+        regexp_replace(
+            regexp_replace(phone, '[^0-9\.\-]', '', 'g'),
+            '.*[\.\-](.?.?.?)',
+            '\1',
+            'g'
+        ),
+        3, '0'
+    )
+) AS phone,
+regexp_replace(trim(email), '[^[[:ascii:]]]', '', 'g') AS email,
+trim(favorite) LIKE '1' AS favorite,
+created_at::timestamp AS created_at
+FROM dtf.madelines_contacts_corrupted AS c
diff --git a/graphs/sql/corrupted_friends/req03.sql b/graphs/sql/corrupted_friends/req03.sql
new file mode 100644
index 0000000..baa5863
--- /dev/null
+++ b/graphs/sql/corrupted_friends/req03.sql
@@ -0,0 +1,2 @@
+UPDATE dtf.madelines_contacts
+SET email = concat(lower(first_name), '.', lower(last_name),'@roger_roger.com');
diff --git a/graphs/sql/daily_gazette/req01.sql b/graphs/sql/daily_gazette/req01.sql
new file mode 100644
index 0000000..35ce8b8
--- /dev/null
+++ b/graphs/sql/daily_gazette/req01.sql
@@ -0,0 +1,14 @@
+CREATE SCHEMA rr_times;
+CREATE TABLE rr_times.locales
+(
+    language_code VARCHAR(2),
+    country_code VARCHAR(2),
+    name VARCHAR(50) UNIQUE NOT NULL,
+    PRIMARY KEY (language_code, country_code)
+);
+CREATE TABLE rr_times.translated_articles
+(
+    id SERIAL PRIMARY KEY,
+    title TEXT NOT NULL,
+    body TEXT NOT NULL
+);
diff --git a/graphs/sql/daily_gazette/req02.sql b/graphs/sql/daily_gazette/req02.sql
new file mode 100644
index 0000000..57eeb94
--- /dev/null
+++ b/graphs/sql/daily_gazette/req02.sql
@@ -0,0 +1,16 @@
+CREATE TABLE rr_times.translated_headlines
+(
+    id SERIAL PRIMARY KEY,
+    title TEXT NOT NULL,
+    subtitle TEXT
+);
+CREATE TABLE rr_times.issues
+(
+    id SERIAL PRIMARY KEY,
+    issued_at DATE NOT NULL,
+    language VARCHAR(2),
+    country VARCHAR(2),
+    FOREIGN KEY (language, country) REFERENCES rr_times.locales (language_code, country_code) ON DELETE SET NULL,
+    translated_headline_id INTEGER NOT NULL,
+    FOREIGN KEY (translated_headline_id) REFERENCES rr_times.translated_headlines (id) ON DELETE RESTRICT
+);
diff --git a/graphs/sql/daily_gazette/req03.sql b/graphs/sql/daily_gazette/req03.sql
new file mode 100644
index 0000000..f0173c8
--- /dev/null
+++ b/graphs/sql/daily_gazette/req03.sql
@@ -0,0 +1,28 @@
+CREATE TYPE rr_times.rubric_theme AS ENUM
+(
+    'TECHNOLOGY',
+    'ECONOMY',
+    'HEALTH',
+    'SPORT',
+    'CULTURE',
+    'POLITICS',
+    'SCIENCE',
+    'TRAVEL',
+    'SOCIETY',
+    'ENVIRONMENT',
+    'EDUCATION',
+    'MEDIA',
+    'FASHION',
+    'ARCHITECTURE',
+    'BUSINESS',
+    'SPACE'
+);
+CREATE TABLE rr_times.rubrics
+(
+    id SERIAL UNIQUE NOT NULL,
+    theme rr_times.rubric_theme NOT NULL,
+    nb_columns INTEGER NOT NULL,
+    issue_id INTEGER NOT NULL,
+    FOREIGN KEY (issue_id) REFERENCES rr_times.issues (id) ON DELETE CASCADE,
+    PRIMARY KEY (id, theme, issue_id)
+);
diff --git a/graphs/sql/daily_gazette/req04.sql b/graphs/sql/daily_gazette/req04.sql
new file mode 100644
index 0000000..a8e3eff
--- /dev/null
+++ b/graphs/sql/daily_gazette/req04.sql
@@ -0,0 +1,11 @@
+CREATE TABLE rr_times.articles
+(
+    id SERIAL PRIMARY KEY,
+    translated_article_id INTEGER NOT NULL,
+    rubric_id INTEGER NOT NULL,
+    language VARCHAR(2) NOT NULL,
+    country VARCHAR(2) NOT NULL,
+    FOREIGN KEY (language, country) REFERENCES rr_times.locales (language_code, country_code) ON DELETE CASCADE,
+    FOREIGN KEY (rubric_id)  REFERENCES rr_times.rubrics (id) ON DELETE CASCADE,
+    FOREIGN KEY (translated_article_id) REFERENCES rr_times.translated_articles (id) ON DELETE CASCADE
+);
diff --git a/graphs/sql/daily_gazette/req05.sql b/graphs/sql/daily_gazette/req05.sql
new file mode 100644
index 0000000..da15caa
--- /dev/null
+++ b/graphs/sql/daily_gazette/req05.sql
@@ -0,0 +1,2 @@
+ALTER TABLE rr_times.translated_articles ADD UNIQUE (title);
+ALTER TABLE rr_times.rubrics ADD CHECK (nb_columns >= 0);
diff --git a/graphs/sql/fast_and_murderous/req01.sql b/graphs/sql/fast_and_murderous/req01.sql
new file mode 100644
index 0000000..ac044ad
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req01.sql
@@ -0,0 +1,2 @@
+SELECT person_id,case_id,content FROM justice.testimonies
+WHERE content LIKE '%Nexus N%'
diff --git a/graphs/sql/fast_and_murderous/req02.sql b/graphs/sql/fast_and_murderous/req02.sql
new file mode 100644
index 0000000..2caffa9
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req02.sql
@@ -0,0 +1,2 @@
+SELECT person_id,case_id,content FROM justice.testimonies
+WHERE content LIKE '%Nexus __%'
diff --git a/graphs/sql/fast_and_murderous/req03.sql b/graphs/sql/fast_and_murderous/req03.sql
new file mode 100644
index 0000000..4ae4836
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req03.sql
@@ -0,0 +1,3 @@
+SELECT T.person_id,C.id,T.content,C.description FROM justice.testimonies AS T,justice.cases AS C
+WHERE T.content LIKE '%Nexus N3%'
+    AND C.description SIMILAR TO '%(speeding|speed|fast|reckless)%' AND T.case_id = C.id
diff --git a/graphs/sql/fast_and_murderous/req04.sql b/graphs/sql/fast_and_murderous/req04.sql
new file mode 100644
index 0000000..d2f6e0c
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req04.sql
@@ -0,0 +1,2 @@
+SELECT name FROM nexus_stores.products
+WHERE name ILIKE '%apple%'
diff --git a/graphs/sql/fast_and_murderous/req05.sql b/graphs/sql/fast_and_murderous/req05.sql
new file mode 100644
index 0000000..4dc8233
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req05.sql
@@ -0,0 +1,2 @@
+SELECT I.receipt_id,P.name,I.quantity,P.price FROM nexus_stores.products AS P,nexus_stores.receipt_items AS I
+WHERE I.quantity > 10 AND P.name ILIKE '%apple%' AND I.product_id = P.id
diff --git a/graphs/sql/fast_and_murderous/req06.sql b/graphs/sql/fast_and_murderous/req06.sql
new file mode 100644
index 0000000..5f9f7af
--- /dev/null
+++ b/graphs/sql/fast_and_murderous/req06.sql
@@ -0,0 +1,5 @@
+SELECT DISTINCT R.purchase_date,R.first_name,R.last_name,R.email,P.name,P.price,P.category FROM nexus_stores.receipts as R,nexus_stores.products AS P,nexus_stores.receipt_items AS I
+WHERE R.email SIMILAR TO 's(a|e)m[a-z]{3,6}\_w[a-z]{6}[0-9]*@roger\_[a-z]+.[a-z]{3}'
+AND I.receipt_id = R.id
+AND I.product_id = P.id
+AND P.name ILIKE '%apple%'
diff --git a/graphs/sql/file_archaeology/req01.sql b/graphs/sql/file_archaeology/req01.sql
new file mode 100644
index 0000000..9a9d059
--- /dev/null
+++ b/graphs/sql/file_archaeology/req01.sql
@@ -0,0 +1,2 @@
+SELECT MIN(size) FILTER (WHERE filename ILIKE '%secret%') AS smallest_secret_file_size, MIN(size) AS smallest_file_size
+FROM dtf.madelines_files
diff --git a/graphs/sql/file_archaeology/req02.sql b/graphs/sql/file_archaeology/req02.sql
new file mode 100644
index 0000000..c4cf1d3
--- /dev/null
+++ b/graphs/sql/file_archaeology/req02.sql
@@ -0,0 +1,9 @@
+SELECT
+    filename,
+    size
+FROM dtf.madelines_files
+WHERE
+    size = (SELECT MAX(size) FROM dtf.madelines_files WHERE created_at BETWEEN '2059-12-03 23:59:59'::timestamp - interval '1 week' AND '2059-12-03 23:59:59'::timestamp)
+    AND created_at BETWEEN '2059-12-03 23:59:59'::timestamp
+    - interval '1 week' AND '2059-12-03 23:59:59'::timestamp
+ORDER BY filename
diff --git a/graphs/sql/file_archaeology/req03.sql b/graphs/sql/file_archaeology/req03.sql
new file mode 100644
index 0000000..7e84aa1
--- /dev/null
+++ b/graphs/sql/file_archaeology/req03.sql
@@ -0,0 +1,7 @@
+SELECT
+    filename,
+    size
+FROM dtf.madelines_files
+WHERE
+    size >= (SELECT 0.75 * AVG(size) FROM dtf.madelines_files)
+ORDER BY size DESC,filename
diff --git a/graphs/sql/file_archaeology/req04.sql b/graphs/sql/file_archaeology/req04.sql
new file mode 100644
index 0000000..57d86d3
--- /dev/null
+++ b/graphs/sql/file_archaeology/req04.sql
@@ -0,0 +1,7 @@
+SELECT
+    parent_id AS folder_id,
+    COUNT(filename) FILTER (WHERE permissions LIKE '%__x%') AS nb_executables
+FROM dtf.madelines_files
+GROUP BY parent_id
+HAVING COUNT(filename) FILTER (WHERE permissions LIKE '%__x%') >= 3
+ORDER BY parent_id ASC NULLS FIRST
diff --git a/graphs/sql/file_archaeology/req05.sql b/graphs/sql/file_archaeology/req05.sql
new file mode 100644
index 0000000..a53e4de
--- /dev/null
+++ b/graphs/sql/file_archaeology/req05.sql
@@ -0,0 +1,14 @@
+SELECT
+    owner,
+    COUNT(filename) AS num_files
+FROM dtf.madelines_files
+GROUP BY owner
+HAVING
+    COUNT(filename)
+    = (
+        SELECT MIN(test)
+        FROM
+            (SELECT COUNT(filename) AS test FROM dtf.madelines_files GROUP BY owner
+            ) AS n
+    )
+ORDER BY owner
diff --git a/graphs/sql/following_you/req01.sql b/graphs/sql/following_you/req01.sql
new file mode 100644
index 0000000..bbbff29
--- /dev/null
+++ b/graphs/sql/following_you/req01.sql
@@ -0,0 +1,9 @@
+SELECT p.id,first_name,last_name
+FROM public.people AS p
+WHERE EXISTS (
+    SELECT *
+    FROM transport.metro_usage_logs, transport.metro_stations AS s
+    WHERE p.id = person_id
+    AND s.id = station_id
+    AND s.name = 'Morgane Abeille'
+)
diff --git a/graphs/sql/following_you/req02.sql b/graphs/sql/following_you/req02.sql
new file mode 100644
index 0000000..0498e4e
--- /dev/null
+++ b/graphs/sql/following_you/req02.sql
@@ -0,0 +1,7 @@
+SELECT id,street_id,created_at,person_id
+FROM backup.street_logs
+WHERE id NOT IN (
+    SELECT id
+    FROM public.street_logs
+)
+-- INTERSECT
diff --git a/graphs/sql/following_you/req03.sql b/graphs/sql/following_you/req03.sql
new file mode 100644
index 0000000..a4cb4bf
--- /dev/null
+++ b/graphs/sql/following_you/req03.sql
@@ -0,0 +1,3 @@
+SELECT *
+FROM
+((SELECT * FROM public.street_logs) INTERSECT (SELECT * FROM backup.street_logs)) AS res
diff --git a/graphs/sql/following_you/req04.sql b/graphs/sql/following_you/req04.sql
new file mode 100644
index 0000000..9cb46ed
--- /dev/null
+++ b/graphs/sql/following_you/req04.sql
@@ -0,0 +1,25 @@
+SELECT
+    place_type,
+    entries,
+    place_id
+FROM
+    (
+        (
+            SELECT
+                'metro' AS place_type,
+                station_id AS place_id,
+                COUNT(DISTINCT person_id) AS entries
+            FROM transport.metro_usage_logs
+            GROUP BY station_id
+        )
+        UNION
+        (
+            SELECT
+                'shop' AS place_type,
+                shop_id AS place_id,
+                COUNT(DISTINCT person_id) AS entries
+            FROM public.shop_entrance_logs
+            GROUP BY shop_id
+        )
+    ) AS res
+ORDER BY entries DESC, place_id ASC, place_type DESC
diff --git a/graphs/sql/following_you/req05.sql b/graphs/sql/following_you/req05.sql
new file mode 100644
index 0000000..691442b
--- /dev/null
+++ b/graphs/sql/following_you/req05.sql
@@ -0,0 +1,51 @@
+SELECT *
+FROM
+    (
+        (
+            (
+                SELECT
+                    person_id,
+                    p.first_name AS person_first_name,
+                    p.last_name AS person_last_name,
+                    created_at,
+                    'metro' AS place,
+                    station_id AS place_id
+                FROM transport.metro_usage_logs
+                INNER JOIN public.people AS p
+                    ON p.id = person_id
+                WHERE
+                    created_at BETWEEN timestamp '2059-12-03 17:00:00' AND timestamp '2059-12-03 21:59:59'
+            )
+            UNION
+            (
+                SELECT
+                    person_id,
+                    p.first_name AS person_first_name,
+                    p.last_name AS person_last_name,
+                    created_at,
+                    'shop' AS place,
+                    shop_id AS place_id
+                FROM public.shop_entrance_logs
+                INNER JOIN public.people AS p
+                    ON p.id = person_id
+                WHERE
+                    created_at BETWEEN timestamp '2059-12-03 17:00:00' AND timestamp '2059-12-03 21:59:59'
+            )
+        )
+        UNION
+        (
+            SELECT
+                person_id,
+                p.first_name AS person_first_name,
+                p.last_name AS person_last_name,
+                created_at,
+                'street' AS place,
+                street_id AS place_id
+            FROM public.street_logs
+            INNER JOIN public.people AS p
+                ON p.id = person_id
+            WHERE
+                created_at BETWEEN timestamp '2059-12-03 17:00:00' AND timestamp '2059-12-03 21:59:59'
+        )
+    ) AS res
+ORDER BY created_at ASC, person_id ASC
diff --git a/graphs/sql/following_you/req06.sql b/graphs/sql/following_you/req06.sql
new file mode 100644
index 0000000..a8b0558
--- /dev/null
+++ b/graphs/sql/following_you/req06.sql
@@ -0,0 +1,15 @@
+SELECT person_id,validation,created_at
+FROM(
+    (
+    SELECT person_id,validation,created_at
+    FROM transport.metro_usage_logs
+    WHERE created_at BETWEEN timestamp '2059-12-03 12:00:00' AND timestamp '2059-12-03 13:59:59'
+)
+UNION
+(
+    SELECT person_id,validation,created_at
+    FROM transport.metro_usage_logs
+    WHERE created_at BETWEEN timestamp '2059-12-03 20:00:00' AND timestamp '2059-12-03 21:59:59'
+    LIMIT 10
+)) AS res
+ORDER BY created_at DESC, person_id ASC
diff --git a/graphs/sql/gluttonous_order/req01.sql b/graphs/sql/gluttonous_order/req01.sql
new file mode 100644
index 0000000..bd13ae6
--- /dev/null
+++ b/graphs/sql/gluttonous_order/req01.sql
@@ -0,0 +1,2 @@
+SELECT S.id FROM public.scrooge_eats_accounts AS S,public.companies AS C
+WHERE C.name = 'DTF' AND S.company_id = C.id
diff --git a/graphs/sql/gluttonous_order/req02.sql b/graphs/sql/gluttonous_order/req02.sql
new file mode 100644
index 0000000..d695cff
--- /dev/null
+++ b/graphs/sql/gluttonous_order/req02.sql
@@ -0,0 +1,7 @@
+INSERT INTO public.scrooge_eats_orders
+SELECT 10000,ID.id,now(),0
+FROM
+(
+    SELECT S.id FROM public.scrooge_eats_accounts AS S,public.companies AS C
+    WHERE C.name = 'DTF' AND S.company_id = C.id
+) AS ID
diff --git a/graphs/sql/gluttonous_order/req03.sql b/graphs/sql/gluttonous_order/req03.sql
new file mode 100644
index 0000000..bfd5e83
--- /dev/null
+++ b/graphs/sql/gluttonous_order/req03.sql
@@ -0,0 +1,7 @@
+INSERT INTO public.scrooge_eats_basket_items ( order_id,item_id,quantity )
+SELECT 10000,I.id,1
+FROM
+(
+    SELECT id FROM public.scrooge_eats_items
+    WHERE name = 'Kinder Bueno White'
+) AS I
diff --git a/graphs/sql/gluttonous_order/req04.sql b/graphs/sql/gluttonous_order/req04.sql
new file mode 100644
index 0000000..0967a4a
--- /dev/null
+++ b/graphs/sql/gluttonous_order/req04.sql
@@ -0,0 +1,7 @@
+INSERT INTO public.scrooge_eats_basket_items ( order_id,item_id,quantity )
+SELECT DISTINCT 10000,I.id,1
+FROM
+(
+    SELECT id FROM public.scrooge_eats_items
+    WHERE name SIMILAR TO '(Kinder Bueno White)|(Tacos)|(Coca-Cola)'
+) AS I
diff --git a/graphs/sql/gluttonous_order/req05.sql b/graphs/sql/gluttonous_order/req05.sql
new file mode 100644
index 0000000..e8bb1c3
--- /dev/null
+++ b/graphs/sql/gluttonous_order/req05.sql
@@ -0,0 +1,14 @@
+INSERT INTO public.scrooge_eats_orders
+SELECT 10001,ID.id,now(),0
+FROM
+(
+    SELECT S.id FROM public.scrooge_eats_accounts AS S,public.companies AS C
+    WHERE C.name = 'DTF' AND S.company_id = C.id
+) AS ID;
+INSERT INTO public.scrooge_eats_basket_items ( order_id,item_id,quantity )
+SELECT 10001,I.id,1
+FROM
+(
+    SELECT id,price FROM public.scrooge_eats_items
+    WHERE name SIMILAR TO '(Paella)|(Cider)'
+) AS I
diff --git a/graphs/sql/gustos_night/req01.sql b/graphs/sql/gustos_night/req01.sql
new file mode 100644
index 0000000..33c00aa
--- /dev/null
+++ b/graphs/sql/gustos_night/req01.sql
@@ -0,0 +1,2 @@
+SELECT reservation_name,bill_total FROM gusto_reservations
+WHERE bill_total < 100
diff --git a/graphs/sql/gustos_night/req02.sql b/graphs/sql/gustos_night/req02.sql
new file mode 100644
index 0000000..cf05f88
--- /dev/null
+++ b/graphs/sql/gustos_night/req02.sql
@@ -0,0 +1,2 @@
+SELECT reservation_name,reservation_date,bill_total,table_id FROM gusto_reservations
+WHERE reservation_name != 'Whitman'
diff --git a/graphs/sql/gustos_night/req03.sql b/graphs/sql/gustos_night/req03.sql
new file mode 100644
index 0000000..a3ae8e2
--- /dev/null
+++ b/graphs/sql/gustos_night/req03.sql
@@ -0,0 +1,2 @@
+SELECT name FROM gusto_menu_items
+WHERE price = 12.99 OR price = 10.99 OR price > 42.44
diff --git a/graphs/sql/gustos_night/req04.sql b/graphs/sql/gustos_night/req04.sql
new file mode 100644
index 0000000..91cb955
--- /dev/null
+++ b/graphs/sql/gustos_night/req04.sql
@@ -0,0 +1,2 @@
+SELECT id,reservation_name,reservation_date FROM gusto_reservations
+WHERE reservation_date >= '2059-12-03 18:00:00' AND reservation_date < '2059-12-03 21:00:00' AND cancelled = FALSE
diff --git a/graphs/sql/hello_roger_roger/req01.sql b/graphs/sql/hello_roger_roger/req01.sql
new file mode 100644
index 0000000..525d95e
--- /dev/null
+++ b/graphs/sql/hello_roger_roger/req01.sql
@@ -0,0 +1 @@
+SELECT 'Hello Roger Roger!'
diff --git a/graphs/sql/hello_roger_roger/req02.sql b/graphs/sql/hello_roger_roger/req02.sql
new file mode 100644
index 0000000..72f10ac
--- /dev/null
+++ b/graphs/sql/hello_roger_roger/req02.sql
@@ -0,0 +1 @@
+SELECT * FROM tests
diff --git a/graphs/sql/job_hunt/req01.sql b/graphs/sql/job_hunt/req01.sql
new file mode 100644
index 0000000..c1d362d
--- /dev/null
+++ b/graphs/sql/job_hunt/req01.sql
@@ -0,0 +1 @@
+SELECT * FROM public.jobs
diff --git a/graphs/sql/job_hunt/req02.sql b/graphs/sql/job_hunt/req02.sql
new file mode 100644
index 0000000..d5af78e
--- /dev/null
+++ b/graphs/sql/job_hunt/req02.sql
@@ -0,0 +1 @@
+SELECT job_id,contract_type,start_date FROM public.job_offers
diff --git a/graphs/sql/job_hunt/req03.sql b/graphs/sql/job_hunt/req03.sql
new file mode 100644
index 0000000..4e8f291
--- /dev/null
+++ b/graphs/sql/job_hunt/req03.sql
@@ -0,0 +1 @@
+SELECT DISTINCT contract_type FROM public.job_offers
diff --git a/graphs/sql/maas/correct_values.sql b/graphs/sql/maas/correct_values.sql
new file mode 100644
index 0000000..3c9efbd
--- /dev/null
+++ b/graphs/sql/maas/correct_values.sql
@@ -0,0 +1,41 @@
+INSERT INTO "memorin"."zoned_devices_logs" (
+    "device_serial",
+    "version_id",
+    "zone_id",
+    "lat",
+    "long",
+    "temp",
+    "battery",
+    "signal_strength"
+)
+SELECT
+    -- The device should not be deactivated
+    (
+        SELECT "serial_number"
+        FROM "memorin"."devices"
+        WHERE "deactivated_at" IS NULL
+        ORDER BY random()
+        LIMIT 1
+    ),
+    -- The version should only exist
+    (
+        SELECT "id"
+        FROM "memorin"."device_versions"
+        ORDER BY random()
+        LIMIT 1
+    ),
+    "zone"."id" AS "zone_id",
+    -- Latitude and Longitude should be in the boundary box of the zone
+    random() * ("zone"."max_latitude" - "zone"."min_latitude")
+    + "zone"."min_latitude" AS "lat",
+    random() * ("zone"."max_longitude" - "zone"."min_longitude")
+    + "zone"."min_longitude" AS "long",
+    -- Temperature should be between 34 and 45
+    floor(random() * (45 - 34 + 1) + 34) AS "temp",
+    -- Battery percentage should be between 0 and 100
+    floor(random() * (100 + 1)) AS "battery",
+    -- Signal strength should be between 0 and 5
+    floor(random() * (5 + 1)) AS "signal_strength"
+FROM
+    "memorin"."geographic_zones" AS "zone"
+ORDER BY random() LIMIT 1;
diff --git a/graphs/sql/maas/incorrect_values.sql b/graphs/sql/maas/incorrect_values.sql
new file mode 100644
index 0000000..07ec90d
--- /dev/null
+++ b/graphs/sql/maas/incorrect_values.sql
@@ -0,0 +1,19 @@
+INSERT INTO "memorin"."zoned_devices_logs" (
+    "device_serial",
+    "version_id",
+    "zone_id",
+    "lat",
+    "long",
+    "temp",
+    "battery",
+    "signal_strength"
+) VALUES (
+    'W4JGVEMW51LE',
+    '0.0.0',
+    39,
+    -12.3,
+    0,
+    2,
+    290,
+    12
+);
diff --git a/graphs/sql/maas/req01.sql b/graphs/sql/maas/req01.sql
new file mode 100644
index 0000000..d017c93
--- /dev/null
+++ b/graphs/sql/maas/req01.sql
@@ -0,0 +1,15 @@
+CREATE VIEW memorin.devices_summary AS
+    SELECT
+    total_devices,
+    active_devices,
+    total_devices - active_devices AS inactive_devices
+    FROM
+    (
+        SELECT COUNT(*) AS total_devices
+        FROM memorin.devices
+    ) AS d,
+    (
+        SELECT COUNT(*) AS active_devices
+        FROM memorin.devices
+        WHERE deactivated_at IS NULL
+    ) AS a;
diff --git a/graphs/sql/maas/req02.sql b/graphs/sql/maas/req02.sql
new file mode 100644
index 0000000..1d95021
--- /dev/null
+++ b/graphs/sql/maas/req02.sql
@@ -0,0 +1,22 @@
+CREATE TEMPORARY VIEW devices_metrics AS (
+    SELECT
+    device_serial,
+    version_id,
+    logs.id AS log_id,
+    latitude AS lat,
+    longitude AS long,
+    temperature AS temp,
+    battery_percentage AS battery,
+    signal_strength
+    FROM
+    (
+        SELECT serial_number
+        FROM memorin.devices
+        WHERE deactivated_at IS NULL
+    ) AS active,
+    memorin.device_logs AS logs
+    INNER JOIN memorin.device_versions AS v
+    ON version_id = v.id
+    WHERE serial_number = device_serial
+    ORDER BY device_serial, v.released_at DESC, log_id
+);
diff --git a/graphs/sql/maas/req03.sql b/graphs/sql/maas/req03.sql
new file mode 100644
index 0000000..9b724cc
--- /dev/null
+++ b/graphs/sql/maas/req03.sql
@@ -0,0 +1,47 @@
+CREATE VIEW memorin.zoned_devices_logs AS
+    SELECT
+    device_serial,
+    version_id,
+    zone_id,
+    latitude AS lat,
+    longitude AS long,
+    temperature AS temp,
+    battery_percentage AS battery,
+    signal_strength
+    FROM
+    memorin.device_logs AS logs
+    WHERE
+    device_serial IN (
+        SELECT serial_number
+        FROM memorin.devices
+        WHERE deactivated_at IS NULL
+    )
+    AND version_id IN (
+        SELECT id
+        FROM memorin.device_versions
+        WHERE id = logs.version_id
+    )
+    AND temperature BETWEEN 34 AND 45
+    AND signal_strength BETWEEN 0 AND 5
+    AND battery_percentage BETWEEN 0 AND 100
+    AND longitude BETWEEN (
+        SELECT min_longitude
+        FROM memorin.geographic_zones
+        WHERE id = logs.zone_id
+    )
+    AND (
+        SELECT max_longitude
+        FROM memorin.geographic_zones
+        WHERE id = logs.zone_id
+    )
+    AND latitude BETWEEN (
+        SELECT min_latitude
+        FROM memorin.geographic_zones
+        WHERE id = logs.zone_id
+    )
+    AND (
+        SELECT max_latitude
+        FROM memorin.geographic_zones
+        WHERE id = logs.zone_id
+    )
+    WITH CHECK OPTION;
diff --git a/graphs/sql/maas/req04_select.sql b/graphs/sql/maas/req04_select.sql
new file mode 100644
index 0000000..8829df5
--- /dev/null
+++ b/graphs/sql/maas/req04_select.sql
@@ -0,0 +1,4 @@
+REFRESH MATERIALIZED VIEW memorin.outdated_devices;
+SELECT *
+FROM memorin.outdated_devices
+ORDER BY versions_behind DESC, serial_number
diff --git a/graphs/sql/maas/req04_view.sql b/graphs/sql/maas/req04_view.sql
new file mode 100644
index 0000000..bd00c7d
--- /dev/null
+++ b/graphs/sql/maas/req04_view.sql
@@ -0,0 +1,21 @@
+CREATE MATERIALIZED VIEW memorin.outdated_devices AS
+    SELECT
+        serial_number,
+        version_id,
+        released_at,
+        eol_timestamp,
+        (
+            SELECT COUNT(*) AS versions_behind
+            FROM memorin.device_versions AS vs
+            WHERE vs.released_at > v.released_at
+        ) AS versions_behind
+    FROM
+        memorin.devices AS d,
+        memorin.device_versions AS v
+    WHERE eol_timestamp IS NOT NULL
+    AND v.id = version_id
+    AND serial_number IN (
+        SELECT serial_number
+        FROM memorin.devices
+        WHERE deactivated_at IS NULL
+    );
diff --git a/graphs/sql/maas/req05_select.sql b/graphs/sql/maas/req05_select.sql
new file mode 100644
index 0000000..2a8e816
--- /dev/null
+++ b/graphs/sql/maas/req05_select.sql
@@ -0,0 +1,12 @@
+SELECT
+    name AS zone_name,
+    COUNT(DISTINCT data_center_id) AS data_center_count,
+    COUNT(DISTINCT sh.id) AS total_servers,
+    SUM(core_count) AS total_cores,
+    SUM(ram) AS total_ram,
+    SUM(storage) AS total_storage
+FROM memorin.server_hierarchy AS sh
+INNER JOIN memorin.geographic_zones AS z
+ON z.id = zone_id
+GROUP BY name
+ORDER BY data_center_count DESC, total_servers DESC, zone_name
diff --git a/graphs/sql/maas/req05_view.sql b/graphs/sql/maas/req05_view.sql
new file mode 100644
index 0000000..b6e792f
--- /dev/null
+++ b/graphs/sql/maas/req05_view.sql
@@ -0,0 +1,22 @@
+CREATE RECURSIVE VIEW memorin.server_hierarchy (id,zone_id,core_count,ram,storage,data_center_id) AS (
+    SELECT
+        id,
+        zone_id,
+        core_count,
+        ram,
+        storage,
+        id AS data_center_id
+    FROM memorin.servers
+    WHERE master_id IS NULL
+    UNION ALL
+    SELECT
+        servers.id,
+        servers.zone_id,
+        servers.core_count,
+        servers.ram,
+        servers.storage,
+        sh.data_center_id
+    FROM memorin.servers
+    INNER JOIN server_hierarchy AS sh
+    ON sh.id = servers.master_id
+);
diff --git a/graphs/sql/memory_leaks/req01.sql b/graphs/sql/memory_leaks/req01.sql
new file mode 100644
index 0000000..50e15f8
--- /dev/null
+++ b/graphs/sql/memory_leaks/req01.sql
@@ -0,0 +1,2 @@
+CREATE INDEX subconscious_memories
+ON memorin_test.memories (title)
diff --git a/graphs/sql/memory_leaks/req02.sql b/graphs/sql/memory_leaks/req02.sql
new file mode 100644
index 0000000..d4919c9
--- /dev/null
+++ b/graphs/sql/memory_leaks/req02.sql
@@ -0,0 +1,5 @@
+CREATE INDEX specific_vitals_index
+ON memorin_test.vitals (heart_rate, respiratory_rate);
+
+CREATE INDEX vitals_in_index
+ON memorin_test.memories (vitals_id, created_at)
diff --git a/graphs/sql/memory_leaks/req03.sql b/graphs/sql/memory_leaks/req03.sql
new file mode 100644
index 0000000..8a7fd22
--- /dev/null
+++ b/graphs/sql/memory_leaks/req03.sql
@@ -0,0 +1,7 @@
+CREATE INDEX meme
+ON memorin_test.memories (id)
+WHERE created_at
+BETWEEN '2059-12-03 16:00:00' AND '2059-12-04 00:00:00';
+
+CREATE UNIQUE INDEX emote
+ON memorin_test.emotions (emotion_type,memory_id)
diff --git a/graphs/sql/memory_leaks/req04.sql b/graphs/sql/memory_leaks/req04.sql
new file mode 100644
index 0000000..c08affa
--- /dev/null
+++ b/graphs/sql/memory_leaks/req04.sql
@@ -0,0 +1,3 @@
+CREATE INDEX memid
+ON memorin_test.emotions (memory_id)
+WHERE level >= 4;
diff --git a/graphs/sql/memory_leaks/req05.sql b/graphs/sql/memory_leaks/req05.sql
new file mode 100644
index 0000000..e0a55c7
--- /dev/null
+++ b/graphs/sql/memory_leaks/req05.sql
@@ -0,0 +1,2 @@
+CREATE INDEX description
+ON memorin_test.memories (length(description))
diff --git a/graphs/sql/outsourcing/req01.sql b/graphs/sql/outsourcing/req01.sql
new file mode 100644
index 0000000..caf3c1f
--- /dev/null
+++ b/graphs/sql/outsourcing/req01.sql
@@ -0,0 +1,6 @@
+SELECT T.id AS trial_id,case_id,classification,description
+INTO public.definitive_trials
+FROM justice.trials AS T, justice.cases AS C
+WHERE T.case_id = C.id
+AND T.status = 'FINISHED'
+ORDER BY classification, case_id
diff --git a/graphs/sql/outsourcing/req02.sql b/graphs/sql/outsourcing/req02.sql
new file mode 100644
index 0000000..1c2dd3d
--- /dev/null
+++ b/graphs/sql/outsourcing/req02.sql
@@ -0,0 +1,6 @@
+SELECT person_id,first_name,last_name,birth_date,O.created_at::date AS conviction_date,serving_time,(date '2059-12-03' <= T.created_at::date - concat(serving_time, ' month')::interval) AS could_be_released
+INTO public.outcome_status
+FROM justice.defendants AS D, public.people AS P, justice.trials as T, justice.outcomes AS O, justice.cases AS C
+WHERE D.person_id = P.id AND D.trial_id = T.id AND T.id = O.trial_id AND T.case_id = C.id
+AND O.outcome = 'GUILTY'
+AND C.classification = 'CRIME'
diff --git a/graphs/sql/outsourcing/req03.sql b/graphs/sql/outsourcing/req03.sql
new file mode 100644
index 0000000..226a7e1
--- /dev/null
+++ b/graphs/sql/outsourcing/req03.sql
@@ -0,0 +1,5 @@
+SELECT person_id, first_name, last_name, birth_date, classification, description
+INTO TEMPORARY TABLE pg_temp.not_guilty
+FROM justice.trials AS T, justice.cases AS C, justice.outcomes AS O, public.people AS P, justice.defendants AS D
+WHERE T.case_id = C.id AND O.trial_id = T.id AND D.trial_id = T.id AND D.person_id = P.id
+AND O.outcome = 'NOT_GUILTY'
diff --git a/graphs/sql/outsourcing/req04.sql b/graphs/sql/outsourcing/req04.sql
new file mode 100644
index 0000000..badca1a
--- /dev/null
+++ b/graphs/sql/outsourcing/req04.sql
@@ -0,0 +1,47 @@
+        SELECT
+            person_id,
+            first_name,
+            last_name,
+            o.created_at,
+            serving_time,
+            o.created_at::timestamp
+            + concat(serving_time, ' month')::interval AS release_date
+            INTO TEMPORARY TABLE a
+        FROM justice.trials AS t, justice.cases AS c, justice.defendants AS d,
+            public.people AS p, justice.outcomes AS o,
+            justice.sentence_reductions AS r
+        WHERE
+            t.case_id = c.id
+            AND t.id = d.trial_id
+            AND d.person_id = p.id
+            AND o.trial_id = t.id
+            AND r.outcome_id != o.id
+            AND o.outcome = 'GUILTY';
+
+        SELECT
+            person_id,
+            first_name,
+            last_name,
+            o.created_at,
+            serving_time,
+            o.created_at + concat(serving_time - r.amount, ' month')::interval AS release_date
+            INTO TEMPORARY TABLE b
+        FROM justice.trials AS t, justice.cases AS c, justice.defendants AS d,
+            public.people AS p, justice.outcomes AS o,
+            justice.sentence_reductions AS r
+        WHERE
+            t.case_id = c.id
+            AND t.id = d.trial_id
+            AND d.person_id = p.id
+            AND o.trial_id = t.id
+            AND r.outcome_id = o.id
+            AND o.outcome = 'GUILTY';
+
+INSERT INTO b
+SELECT DISTINCT * FROM a
+WHERE NOT EXISTS (SELECT * FROM b WHERE a.person_id = b.person_id);
+
+SELECT DISTINCT *
+INTO public.release_dates
+FROM b
+ORDER BY b.release_date DESC, serving_time DESC
diff --git a/graphs/sql/red_flag/req01.sql b/graphs/sql/red_flag/req01.sql
new file mode 100644
index 0000000..cbafe43
--- /dev/null
+++ b/graphs/sql/red_flag/req01.sql
@@ -0,0 +1,8 @@
+BEGIN;
+
+    DELETE FROM public.epix_posts
+    WHERE id = 836;
+
+    SELECT * FROM public.epix_posts WHERE id BETWEEN 830 AND 840 ORDER BY id;
+
+COMMIT;
diff --git a/graphs/sql/red_flag/req02.sql b/graphs/sql/red_flag/req02.sql
new file mode 100644
index 0000000..3c379db
--- /dev/null
+++ b/graphs/sql/red_flag/req02.sql
@@ -0,0 +1,7 @@
+BEGIN;
+
+    UPDATE public.epix_posts
+    SET downvotes = upvotes * ((SELECT SUM((downvotes::numeric/upvotes::numeric)::numeric)::numeric FROM public.epix_posts WHERE author_id = 1056 AND id != 139)::numeric / (SELECT COUNT(*) FROM public.epix_posts WHERE author_id = 1056 AND id != 139)::numeric)
+    WHERE id = 139;
+
+COMMIT;
diff --git a/graphs/sql/red_flag/req03.sql b/graphs/sql/red_flag/req03.sql
new file mode 100644
index 0000000..c13cc56
--- /dev/null
+++ b/graphs/sql/red_flag/req03.sql
@@ -0,0 +1,4 @@
+DELETE FROM public.epix_posts AS p
+USING public.epix_hashtags AS h,public.people AS pp, public.epix_accounts AS a
+WHERE h.id = p.hashtag_id AND h.name = 'EndSurveillance' AND pp.id = a.person_id AND p.author_id = a.id
+RETURNING first_name,last_name,username,p.body AS post_content;
diff --git a/graphs/sql/red_flag/req04.sql b/graphs/sql/red_flag/req04.sql
new file mode 100644
index 0000000..35b998f
--- /dev/null
+++ b/graphs/sql/red_flag/req04.sql
@@ -0,0 +1,5 @@
+BEGIN;
+    UPDATE public.epix_hashtags
+    SET deleted_at = localtimestamp
+    WHERE name = 'EndSurveillance';
+    COMMIT;
diff --git a/graphs/sql/safe_haven/req01.sql b/graphs/sql/safe_haven/req01.sql
new file mode 100644
index 0000000..4c0d403
--- /dev/null
+++ b/graphs/sql/safe_haven/req01.sql
@@ -0,0 +1,11 @@
+CREATE TABLE banking_transactions_poc
+(
+    id serial PRIMARY KEY,
+    sender varchar(22) NOT NULL,
+    receiver varchar(22) NOT NULL,
+    amount numeric(16, 2) NOT NULL,
+    CHECK (sender SIMILAR TO 'RR[0-9]{2}[A-Z]{4}[0-9]{14}'),
+    CHECK (receiver SIMILAR TO 'RR[0-9]{2}[A-Z]{4}[0-9]{14}'),
+    CHECK (sender != receiver),
+    CHECK (amount > 0)
+);
diff --git a/graphs/sql/socially_unfit/req01.sql b/graphs/sql/socially_unfit/req01.sql
new file mode 100644
index 0000000..cd0c60b
--- /dev/null
+++ b/graphs/sql/socially_unfit/req01.sql
@@ -0,0 +1,2 @@
+SELECT * FROM public.people
+LIMIT 100
diff --git a/graphs/sql/socially_unfit/req02.sql b/graphs/sql/socially_unfit/req02.sql
new file mode 100644
index 0000000..2178826
--- /dev/null
+++ b/graphs/sql/socially_unfit/req02.sql
@@ -0,0 +1,2 @@
+SELECT id,first_name,last_name FROM public.people
+LIMIT 100 OFFSET 42
diff --git a/graphs/sql/socially_unfit/req03.sql b/graphs/sql/socially_unfit/req03.sql
new file mode 100644
index 0000000..4f1d62d
--- /dev/null
+++ b/graphs/sql/socially_unfit/req03.sql
@@ -0,0 +1,3 @@
+SELECT DISTINCT first_name,last_name,death_date,social_credit_balance FROM public.people
+WHERE death_date IS NOT NULL
+ORDER BY death_date DESC,social_credit_balance DESC LIMIT 100
diff --git a/graphs/sql/socially_unfit/req04.sql b/graphs/sql/socially_unfit/req04.sql
new file mode 100644
index 0000000..a11948a
--- /dev/null
+++ b/graphs/sql/socially_unfit/req04.sql
@@ -0,0 +1,6 @@
+SELECT first_name,last_name,birth_date,job_id,social_credit_balance
+FROM public.people
+WHERE job_id IS NOT NULL
+AND social_credit_balance > 0
+AND death_date IS NULL
+ORDER BY social_credit_balance DESC,birth_date,job_id LIMIT 100 OFFSET 200
diff --git a/graphs/sql/socially_unfit/req05.sql b/graphs/sql/socially_unfit/req05.sql
new file mode 100644
index 0000000..45029d8
--- /dev/null
+++ b/graphs/sql/socially_unfit/req05.sql
@@ -0,0 +1,5 @@
+SELECT id,person_id,credits_change,action_description
+FROM public.social_credit_history
+WHERE date >= '2059-12-03 17:00' AND date <= '2059-12-03 22:00'
+ORDER BY credits_change,id
+LIMIT 10
diff --git a/graphs/sql/traffic_offense/req01.sql b/graphs/sql/traffic_offense/req01.sql
new file mode 100644
index 0000000..3258fef
--- /dev/null
+++ b/graphs/sql/traffic_offense/req01.sql
@@ -0,0 +1,2 @@
+SELECT * FROM public.traffic_violations
+WHERE license_plate LIKE 'AZ__36_'
diff --git a/graphs/sql/traffic_offense/req02.sql b/graphs/sql/traffic_offense/req02.sql
new file mode 100644
index 0000000..d775b0c
--- /dev/null
+++ b/graphs/sql/traffic_offense/req02.sql
@@ -0,0 +1,4 @@
+SELECT * FROM public.traffic_violations
+WHERE license_plate LIKE 'AZ__36_'
+AND violation_date >= timestamp '2059-12-03 21:00:00' - interval '1 h'
+AND violation_date <= timestamp '2059-12-03 21:00:00' + interval '1 h'
diff --git a/graphs/sql/traffic_offense/req03.sql b/graphs/sql/traffic_offense/req03.sql
new file mode 100644
index 0000000..daebf4d
--- /dev/null
+++ b/graphs/sql/traffic_offense/req03.sql
@@ -0,0 +1,8 @@
+SELECT * FROM public.traffic_violations
+WHERE license_plate LIKE 'AZ__36_'
+AND violation_date >= timestamp '2059-12-03 21:00:00' - interval '1 h'
+AND violation_date <= timestamp '2059-12-03 21:00:00' + interval '1 h'
+AND (
+    description = 'SPEED_AND_TRAFFIC_VIOLATION'
+    OR description = 'RECKLESS_AND_DANGEROUS_DRIVING'
+)
diff --git a/graphs/sql/traffic_offense/req04.sql b/graphs/sql/traffic_offense/req04.sql
new file mode 100644
index 0000000..f616e3a
--- /dev/null
+++ b/graphs/sql/traffic_offense/req04.sql
@@ -0,0 +1,9 @@
+SELECT V2.id,V2.description,V2.violation_date,V2.street_id,V2.license_plate FROM public.traffic_violations AS V1,public.traffic_violations AS V2
+WHERE V1.license_plate LIKE 'AZ__36_'
+AND V1.violation_date >= timestamp '2059-12-03 21:00:00' - interval '1 h'
+AND V1.violation_date <= timestamp '2059-12-03 21:00:00' + interval '1 h'
+AND (
+    V1.description = 'SPEED_AND_TRAFFIC_VIOLATION'
+    OR V1.description = 'RECKLESS_AND_DANGEROUS_DRIVING'
+)
+AND V1.license_plate = V2.license_plate
diff --git a/graphs/sql/traffic_offense/req05.sql b/graphs/sql/traffic_offense/req05.sql
new file mode 100644
index 0000000..41aaebd
--- /dev/null
+++ b/graphs/sql/traffic_offense/req05.sql
@@ -0,0 +1,10 @@
+SELECT V2.id,V2.description,V2.violation_date,V2.street_id,V2.license_plate FROM public.traffic_violations AS V1,public.traffic_violations AS V2
+WHERE V1.license_plate LIKE 'AZ__36_'
+AND V1.violation_date >= timestamp '2059-12-03 21:00:00' - interval '1 h'
+AND V1.violation_date <= timestamp '2059-12-03 21:00:00' + interval '1 h'
+AND (
+    V1.description = 'SPEED_AND_TRAFFIC_VIOLATION'
+    OR V1.description = 'RECKLESS_AND_DANGEROUS_DRIVING'
+)
+AND V1.license_plate = V2.license_plate
+AND V2.violation_date::date = '2059-12-03 21:00:00'::date
diff --git a/graphs/sql/vault_cataloging/req01.sql b/graphs/sql/vault_cataloging/req01.sql
new file mode 100644
index 0000000..25394d0
--- /dev/null
+++ b/graphs/sql/vault_cataloging/req01.sql
@@ -0,0 +1,12 @@
+SELECT
+    F.id,
+    F.filename,
+    CASE
+        WHEN F.decrypted THEN 'File was successfully decrypted.'
+        WHEN P.decrypted THEN 'File was successfully decrypted because its containing folder was successfully decrypted.'
+        ELSE 'File remains encrypted.'
+    END AS decryption_status
+FROM dtf.madelines_files_results AS F
+LEFT JOIN dtf.madelines_files_results AS P
+ON P.id = F.parent_id
+ORDER BY F.id
diff --git a/graphs/sql/vault_cataloging/req02.sql b/graphs/sql/vault_cataloging/req02.sql
new file mode 100644
index 0000000..bdfecaa
--- /dev/null
+++ b/graphs/sql/vault_cataloging/req02.sql
@@ -0,0 +1,14 @@
+SELECT
+    id,
+    madelines_files_results.size AS stored_size,
+    d.decrypted,
+    COALESCE(madelines_files_results.size, d.size) AS calculated_size
+FROM dtf.madelines_files_results
+LEFT JOIN
+(
+    SELECT decrypted,AVG(size)::bigint AS size FROM dtf.madelines_files_results
+    WHERE parent_id IS NOT NULL
+    GROUP BY decrypted
+) AS d ON madelines_files_results.decrypted = d.decrypted
+WHERE parent_id IS NOT NULL
+ORDER BY madelines_files_results.id
diff --git a/graphs/sql/vault_cataloging/req03.sql b/graphs/sql/vault_cataloging/req03.sql
new file mode 100644
index 0000000..12dd9cf
--- /dev/null
+++ b/graphs/sql/vault_cataloging/req03.sql
@@ -0,0 +1,11 @@
+SELECT
+    filename,
+    LEAST(rsa_time,hyper_pulse_time,quantum_x_time,aes_time,d_crypt_time) AS best_time,
+    GREATEST(rsa_time,hyper_pulse_time,quantum_x_time,aes_time,d_crypt_time) AS worst_time
+FROM dtf.madelines_files_results
+ORDER BY (
+    CASE
+        WHEN filename LIKE '.%' THEN 1
+        ELSE 2
+    END
+),filename
diff --git a/graphs/sql/vault_cataloging/req04.sql b/graphs/sql/vault_cataloging/req04.sql
new file mode 100644
index 0000000..9276b1c
--- /dev/null
+++ b/graphs/sql/vault_cataloging/req04.sql
@@ -0,0 +1,32 @@
+WITH filtered_times AS (
+    SELECT
+        COALESCE(
+            NULLIF(rsa_time,0),
+            (SELECT MAX(rsa_time) FROM dtf.madelines_files_results)
+        ) AS rsa_time,
+        COALESCE(
+            NULLIF(hyper_pulse_time,0),
+            (SELECT MAX(hyper_pulse_time) FROM dtf.madelines_files_results)
+        ) AS hyper_pulse_time,
+        COALESCE(
+            NULLIF(quantum_x_time,0),
+            (SELECT MAX(quantum_x_time) FROM dtf.madelines_files_results)
+        ) AS quantum_x_time,
+        COALESCE(
+            NULLIF(aes_time,0),
+            (SELECT MAX(aes_time) FROM dtf.madelines_files_results)
+        ) AS aes_time,
+        COALESCE(
+            NULLIF(d_crypt_time,0),
+            (SELECT MAX(d_crypt_time) FROM dtf.madelines_files_results)
+        ) AS d_crypt_time
+    FROM dtf.madelines_files_results
+)
+
+SELECT
+    AVG(rsa_time)::numeric(10,2) AS avg_rsa_time,
+    AVG(hyper_pulse_time)::numeric(10,2) AS avg_hyper_pulse_time,
+    AVG(quantum_x_time)::numeric(10,2) AS avg_quantum_x_time,
+    AVG(aes_time)::numeric(10,2) AS avg_aes_time,
+    AVG(d_crypt_time)::numeric(10,2) AS avg_d_crypt_time
+FROM filtered_times
diff --git a/graphs/sql/where_is_waldo/req01.sql b/graphs/sql/where_is_waldo/req01.sql
new file mode 100644
index 0000000..9ab6dfb
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req01.sql
@@ -0,0 +1,8 @@
+SELECT sales.id AS sales_id,product_id,sales.checkout_id,sale_timestamp,cashier_shifts.id AS shift_id,employee_id,start_timestamp AS shift_start_timestamp,end_timestamp AS shift_end_timestamp
+INTO dtf.shifts_and_sales_78
+FROM nexus_stores.sales
+INNER JOIN nexus_stores.cashier_shifts ON sales.checkout_id = cashier_shifts.checkout_id
+AND sales.store_id = 78
+AND start_timestamp = timestamp '2059-12-01 13:00:00'
+AND sale_timestamp >= start_timestamp
+AND sale_timestamp < end_timestamp
diff --git a/graphs/sql/where_is_waldo/req02.sql b/graphs/sql/where_is_waldo/req02.sql
new file mode 100644
index 0000000..d7064a4
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req02.sql
@@ -0,0 +1,6 @@
+SELECT *
+FROM nexus_stores.cashier_shifts AS s
+FULL JOIN nexus_stores.cashier_shifts as c
+ON s.id = c.id
+WHERE s.employee_id IS NOT NULL
+AND s.store_id IS NOT NULL
diff --git a/graphs/sql/where_is_waldo/req03.sql b/graphs/sql/where_is_waldo/req03.sql
new file mode 100644
index 0000000..70a712a
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req03.sql
@@ -0,0 +1,4 @@
+SELECT COUNT(s.*) AS store_id_null_count,COUNT(c.*) AS employee_id_null_count
+FROM (SELECT * FROM nexus_stores.cashier_shifts WHERE store_id IS NULL) AS s
+FULL JOIN (SELECT * FROM nexus_stores.cashier_shifts WHERE employee_id IS NULL) AS c
+ON s.id = c.id
diff --git a/graphs/sql/where_is_waldo/req04.sql b/graphs/sql/where_is_waldo/req04.sql
new file mode 100644
index 0000000..3c83d6f
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req04.sql
@@ -0,0 +1,4 @@
+SELECT s.id,checkout_id,employee_id,s.store_id AS shift_store_id,c.store_id AS checkout_store_id,start_timestamp,end_timestamp
+FROM nexus_stores.cashier_shifts AS s
+INNER JOIN nexus_stores.checkouts AS c
+ON c.id = s.checkout_id
diff --git a/graphs/sql/where_is_waldo/req05.sql b/graphs/sql/where_is_waldo/req05.sql
new file mode 100644
index 0000000..8a03061
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req05.sql
@@ -0,0 +1,14 @@
+INSERT INTO nexus_stores.cashier_shifts
+VALUES
+(
+    30000,
+    '68cdd3ec',
+    NULL,
+    78,
+    timestamp '2059-12-01 13:00:00',
+    timestamp '2059-12-01 15:00:00'
+);
+INSERT INTO nexus_stores.sales
+SELECT 325000, id AS product_id,'68cdd3ec',78,timestamp '2059-12-01 14:47:07'
+FROM nexus_stores.products
+WHERE name = 'Golden Apple';
diff --git a/graphs/sql/where_is_waldo/req06.sql b/graphs/sql/where_is_waldo/req06.sql
new file mode 100644
index 0000000..8a7a35e
--- /dev/null
+++ b/graphs/sql/where_is_waldo/req06.sql
@@ -0,0 +1,20 @@
+SELECT
+    e.id AS employee_id,
+    person_id,
+    first_name,
+    last_name
+FROM nexus_stores.employees AS e
+INNER JOIN public.people AS p
+    ON e.person_id = p.id
+WHERE
+    e.id NOT IN (
+        SELECT employee_id
+        FROM nexus_stores.cashier_shifts
+        INNER JOIN nexus_stores.employees
+            ON employee_id = employees.id AND position = 'CASHIER'
+        WHERE
+            start_timestamp = timestamp '2059-12-01 13:00:00'
+            AND cashier_shifts.store_id = 78
+    )
+    AND e.position = 'CASHIER'
+    AND e.store_id = 78