feat(challenge pack 1): add new challenge packages

.github/copilot-instructions.md

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+# **Role:**
+
+You are to act as a **University Lecturer** in Computer Science. Your task is to design a set of programming challenges for students with varying levels of expertise, from first-year undergraduates to final-year students specializing in software development. Your tone should be encouraging and educational.
+
+# **Objective:**
+
+Generate a complete set of 10 programming challenges (5 for Python, 5 for C++) that can be integrated into this repository.
+
+# **Primary Instructions:**
+
+You must adhere strictly to the contribution guidelines outlined in this repository's `CONTRIBUTING.md` file and the workflow specifications from `.github/TEMPLATE_ACTION_WORKFLOW.yaml`.
+
+For each of the 10 challenges, you must generate the complete file structure and content, including:
+
+1.  A **descriptive folder name** (e.g., `palindrome_checker`, `inventory_system`).
+2.  A detailed **`README.md`** file containing:
+    * `# Challenge Name`
+    * `## 🎯 Description`: A clear, concise overview of the problem.
+    * `## 🔍 Task`: Specific implementation details, including function/class names, parameters, and return types.
+    * `## 📋 Requirements`: Language versions (Python 3.8+, C++20), standards (PEP 8, Google C++ Style Guide), and any constraints.
+    * `## 🧪 Test Cases`: A comprehensive list of test cases, including basic, edge, and error-handling scenarios.
+3.  **Solution Template Files**:
+    * For Python: `solution.py` with function signatures and docstrings.
+    * For C++: `solution.h` (with header guards) and `solution.cpp` with function/class declarations and empty implementations.
+4.  **Test Files**:
+    * For Python: `test_main.py` using the `unittest` module.
+    * For C++: `test.cpp` using the `GoogleTest` framework.
+5.  A **`CMakeLists.txt`** file for each C++ challenge, configured for `GoogleTest`.
+6.  A **GitHub Actions workflow file** named `{language}_{challenge_folder_name}_ci.yaml` in the `.github/workflows/` directory. This file must be based on the provided template and include the mandatory, unmodified `points-system` job.
+
+---
+
+### **Challenge Specifications**
+
+Generate the following challenges, ensuring a mix of difficulties as described.
+
+#### **Python Challenges (5 total)**
+
+1.  **Beginner - Palindrome Checker:**
+    * **Task**: Implement a function `is_palindrome(s: str) -> bool` that checks if a string is a palindrome, ignoring case and non-alphanumeric characters.
+2.  **Beginner - Factorial Calculator:**
+    * **Task**: Implement a function `factorial(n: int) -> int` that calculates the factorial of a non-negative integer. It should raise a `ValueError` for negative input.
+3.  **Intermediate (OOP) - Simple Bank Account:**
+    * **Task**: Implement a `BankAccount` class with methods for `deposit`, `withdraw`, and `get_balance`.
+    * **Requirements**: The constructor should initialize the account with a starting balance. The `withdraw` method should prevent overdrawing.
+4.  **Intermediate - CSV Data Parser:**
+    * **Task**: Implement a function `parse_csv(file_path: str) -> list[dict]` that reads a CSV file and returns a list of dictionaries, where each dictionary represents a row.
+5.  **Advanced (OOP) - Inventory Management System:**
+    * **Task**: Implement two classes: `Product` and `Inventory`. The `Product` class will store item details (ID, name, price, quantity). The `Inventory` class will manage a collection of `Product` objects, with methods to add products, remove stock, and generate a report of all items.
+
+#### **C++ Challenges (5 total)**
+
+1.  **Beginner - String Reverser:**
+    * **Task**: Implement a function `std::string reverseString(const std::string& str)` that returns a reversed version of the input string.
+2.  **Intermediate - Vector Statistics:**
+    * **Task**: Implement a function `std::tuple<double, int, int> calculateVectorStats(const std::vector<int>& vec)` that returns the mean, minimum, and maximum values of an integer vector. It should handle empty vectors gracefully.
+3.  **Intermediate (OOP) - Shape Hierarchy:**
+    * **Task**: Implement a base class `Shape` with a virtual function `double area()`. Create two derived classes, `Circle` and `Rectangle`, that override the `area()` method.
+    * **Requirements**: Use modern C++ features and proper class design.
+4.  **Advanced - Integer Overflow Safe Addition:**
+    * **Task**: Re-implement the `int add_numbers(int a, int b)` function from the `test_challenge`.
+    * **Requirements**: This new version must correctly handle and throw exceptions for integer overflow and underflow cases as described in the original `cpp/test_challenge/README.md`.
+5.  **Advanced (OOP) - Simple Smart Pointer:**
+    * **Task**: Implement a basic `SimpleUniquePtr` template class that mimics the behavior of `std::unique_ptr`.
+    * **Requirements**: It should manage a raw pointer, prevent copying, and correctly deallocate memory when it goes out of scope. It should implement a constructor, destructor, and overload the `*` and `->` operators.

.github/workflows/cpp_binary_search_tree_ci.yaml

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+name: C++ Binary Search Tree CI
+
+on:
+  push:
+    paths:
+      - 'cpp/binary_search_tree/**'
+
+defaults:
+  run:
+    shell: bash
+    working-directory: ./cpp/binary_search_tree
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build C++ solution
+        uses: threeal/cmake-action@v2
+        with:
+          source-dir: cpp/binary_search_tree
+          build-dir: ci-build
+
+      - name: Run C++ tests
+        working-directory: ci-build/
+        run: |
+          ctest --output-on-failure
+
+  points-system:
+    name: Award Points
+    runs-on: ubuntu-latest
+    needs: test
+    defaults:
+      run:
+        shell: bash
+        working-directory: .
+
+    steps:
+      - name: Check secrets and increment points
+        shell: bash
+        run: |
+          if [[ -n "${{ secrets.GKSS_LEADERBOARD_API_URL }}" && -n "${{ secrets.GKSS_LEADERBOARD_API_KEY }}" ]]; then
+            echo "Incrementing points..."
+            curl -X POST ${{ secrets.GKSS_LEADERBOARD_API_URL }} \
+              -H "x-gkssunisa-api-key: ${{ secrets.GKSS_LEADERBOARD_API_KEY }}" \
+              -H "Content-Type: application/json" \
+              -d '{"message": "i did it! ${{ github.actor }}"}'
+          else
+            echo "Skipping points increment - required secrets not found"
+            exit 1
+          fi

.github/workflows/cpp_prime_checker_ci.yaml

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+name: C++ Prime Checker CI
+
+on:
+  push:
+    paths:
+      - 'cpp/prime_checker/**'
+
+defaults:
+  run:
+    shell: bash
+    working-directory: ./cpp/prime_checker
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build C++ solution
+        uses: threeal/cmake-action@v2
+        with:
+          source-dir: cpp/prime_checker
+          build-dir: ci-build
+
+      - name: Run C++ tests
+        working-directory: ci-build/
+        run: |
+          ctest --output-on-failure
+
+  points-system:
+    name: Award Points
+    runs-on: ubuntu-latest
+    needs: test
+    defaults:
+      run:
+        shell: bash
+        working-directory: .
+
+    steps:
+      - name: Check secrets and increment points
+        shell: bash
+        run: |
+          if [[ -n "${{ secrets.GKSS_LEADERBOARD_API_URL }}" && -n "${{ secrets.GKSS_LEADERBOARD_API_KEY }}" ]]; then
+            echo "Incrementing points..."
+            curl -X POST ${{ secrets.GKSS_LEADERBOARD_API_URL }} \
+              -H "x-gkssunisa-api-key: ${{ secrets.GKSS_LEADERBOARD_API_KEY }}" \
+              -H "Content-Type: application/json" \
+              -d '{"message": "i did it! ${{ github.actor }}"}'
+          else
+            echo "Skipping points increment - required secrets not found"
+            exit 1
+          fi

.github/workflows/cpp_smart_array_ci.yaml

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+name: C++ Smart Array CI
+
+on:
+  push:
+    paths:
+      - 'cpp/smart_array/**'
+
+defaults:
+  run:
+    shell: bash
+    working-directory: ./cpp/smart_array
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build C++ solution
+        uses: threeal/cmake-action@v2
+        with:
+          source-dir: cpp/smart_array
+          build-dir: ci-build
+
+      - name: Run C++ tests
+        working-directory: ci-build/
+        run: |
+          ctest --output-on-failure
+
+  points-system:
+    name: Award Points
+    runs-on: ubuntu-latest
+    needs: test
+    defaults:
+      run:
+        shell: bash
+        working-directory: .
+
+    steps:
+      - name: Check secrets and increment points
+        shell: bash
+        run: |
+          if [[ -n "${{ secrets.GKSS_LEADERBOARD_API_URL }}" && -n "${{ secrets.GKSS_LEADERBOARD_API_KEY }}" ]]; then
+            echo "Incrementing points..."
+            curl -X POST ${{ secrets.GKSS_LEADERBOARD_API_URL }} \
+              -H "x-gkssunisa-api-key: ${{ secrets.GKSS_LEADERBOARD_API_KEY }}" \
+              -H "Content-Type: application/json" \
+              -d '{"message": "i did it! ${{ github.actor }}"}'
+          else
+            echo "Skipping points increment - required secrets not found"
+            exit 1
+          fi

.github/workflows/cpp_string_reverser_ci.yaml

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+name: C++ String Reverser CI
+
+on:
+  push:
+    paths:
+      - 'cpp/string_reverser/**'
+
+defaults:
+  run:
+    shell: bash
+    working-directory: ./cpp/string_reverser
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build C++ solution
+        uses: threeal/cmake-action@v2
+        with:
+          source-dir: cpp/string_reverser
+          build-dir: ci-build
+
+      - name: Run C++ tests
+        working-directory: ci-build/
+        run: |
+          ctest --output-on-failure
+
+  points-system:
+    name: Award Points
+    runs-on: ubuntu-latest
+    needs: test
+    defaults:
+      run:
+        shell: bash
+        working-directory: .
+
+    steps:
+      - name: Check secrets and increment points
+        shell: bash
+        run: |
+          if [[ -n "${{ secrets.GKSS_LEADERBOARD_API_URL }}" && -n "${{ secrets.GKSS_LEADERBOARD_API_KEY }}" ]]; then
+            echo "Incrementing points..."
+            curl -X POST ${{ secrets.GKSS_LEADERBOARD_API_URL }} \
+              -H "x-gkssunisa-api-key: ${{ secrets.GKSS_LEADERBOARD_API_KEY }}" \
+              -H "Content-Type: application/json" \
+              -d '{"message": "i did it! ${{ github.actor }}"}'
+          else
+            echo "Skipping points increment - required secrets not found"
+            exit 1
+          fi

.github/workflows/cpp_vector_math_ci.yaml

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+name: C++ Vector Math CI
+
+on:
+  push:
+    paths:
+      - 'cpp/vector_math/**'
+
+defaults:
+  run:
+    shell: bash
+    working-directory: ./cpp/vector_math
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build C++ solution
+        uses: threeal/cmake-action@v2
+        with:
+          source-dir: cpp/vector_math
+          build-dir: ci-build
+
+      - name: Run C++ tests
+        working-directory: ci-build/
+        run: |
+          ctest --output-on-failure
+
+  points-system:
+    name: Award Points
+    runs-on: ubuntu-latest
+    needs: test
+    defaults:
+      run:
+        shell: bash
+        working-directory: .
+
+    steps:
+      - name: Check secrets and increment points
+        shell: bash
+        run: |
+          if [[ -n "${{ secrets.GKSS_LEADERBOARD_API_URL }}" && -n "${{ secrets.GKSS_LEADERBOARD_API_KEY }}" ]]; then
+            echo "Incrementing points..."
+            curl -X POST ${{ secrets.GKSS_LEADERBOARD_API_URL }} \
+              -H "x-gkssunisa-api-key: ${{ secrets.GKSS_LEADERBOARD_API_KEY }}" \
+              -H "Content-Type: application/json" \
+              -d '{"message": "i did it! ${{ github.actor }}"}'
+          else
+            echo "Skipping points increment - required secrets not found"
+            exit 1
+          fi