feat: add cpp support

.gitignore

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+# VSCode related
+.vscode/
+
+# MacOS related
+.DS_Store

cpp/.gitignore

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+# Build
+build/
+
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app

cpp/Makefile

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+CXX = clang++
+CXXFLAGS = -std=c++17 -Wall -Wextra -Werror -g
+PROBLEM_DIR = problems
+TEST_DIR = tests
+BUILD_DIR = build
+
+# Colors for output
+RED = \033[0;31m
+GREEN = \033[0;32m
+YELLOW = \033[1;33m
+BLUE = \033[1;34m
+NC = \033[0m  # No Color
+
+# Create build directory structure if it doesn't exist
+$(shell mkdir -p $(BUILD_DIR))
+$(shell find $(PROBLEM_DIR) -type d | sed 's|^$(PROBLEM_DIR)|$(BUILD_DIR)|' | xargs -I {} mkdir -p {})
+$(shell find $(TEST_DIR) -type d | sed 's|^$(TEST_DIR)|$(BUILD_DIR)|' | xargs -I {} mkdir -p {})
+
+# Find all .cpp files in problems and tests subdirectories (recursively)
+PROBLEM_SRCS := $(shell find $(PROBLEM_DIR) -name "*.cpp")
+TEST_SRCS := $(filter-out $(TEST_DIR)/test.cpp, $(shell find $(TEST_DIR) -name "*.cpp"))
+MAIN_SRC := $(TEST_DIR)/test.cpp
+
+# Convert source file paths to object file paths in the build directory
+PROBLEM_OBJS := $(patsubst $(PROBLEM_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(PROBLEM_SRCS))
+TEST_OBJS := $(patsubst $(TEST_DIR)/%.cpp, $(BUILD_DIR)/%.o, $(TEST_SRCS))
+MAIN_OBJ := $(BUILD_DIR)/test.o
+
+# Target to build all tests
+all: $(BUILD_DIR)/tests
+
+# Compile each problem .cpp file to a .o file in the build directory
+$(BUILD_DIR)/%.o: $(PROBLEM_DIR)/%.cpp
+	@echo "$(YELLOW)Compiling $<...$(NC)"
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+# Compile each test .cpp file to a .o file in the build directory
+$(BUILD_DIR)/%.o: $(TEST_DIR)/%.cpp
+	@echo "$(YELLOW)Compiling $<...$(NC)"
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+# Compile the main file separately
+$(MAIN_OBJ): $(MAIN_SRC)
+	@echo "$(YELLOW)Compiling main file $<...$(NC)"
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+# Link all object files to create the test executable
+$(BUILD_DIR)/tests: $(PROBLEM_OBJS) $(TEST_OBJS) $(MAIN_OBJ)
+	@echo "$(GREEN)Linking all tests...$(NC)"
+	$(CXX) $(CXXFLAGS) -o $@ $^
+
+# Run tests
+run_tests: $(BUILD_DIR)/tests
+	@echo "$(GREEN)Running all tests...$(NC)"
+	$(BUILD_DIR)/tests
+
+# Formatting
+format:
+	@echo "$(BLUE)Formatting C++ files...$(NC)"
+	@clang-format -i $(PROBLEM_SRCS) $(TEST_SRCS) $(MAIN_SRC)
+	@echo "$(GREEN)Formatting completed.$(NC)"
+
+# Clean build artifacts
+clean:
+	@echo "$(RED)Cleaning build artifacts...$(NC)"
+	@rm -rf $(BUILD_DIR)/*
+	@echo "$(GREEN)Clean completed.$(NC)"
+
+.PHONY: all run_tests clean format

cpp/problems/easy/add_two_numbers/add_two_numbers.cpp

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+#include "add_two_numbers.h"
+
+int add_two_numbers(int a, int b) {
+    return a + b;
+}

cpp/problems/easy/add_two_numbers/add_two_numbers.h

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+#ifndef ADD_TWO_NUMBERS_H
+#define ADD_TWO_NUMBERS_H
+
+int add_two_numbers(int a, int b);
+
+#endif // ADD_TWO_NUMBERS_H

cpp/tests/easy_tests/add_two_numbers/test_add_two_numbers.cpp

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+#include "test_add_two_numbers.h"
+
+#include <cassert>
+#include <iostream>
+#include "../../../problems/easy/add_two_numbers/add_two_numbers.h"
+
+void test_add_two_numbers() {
+    assert(add_two_numbers(2, 3) == 5);
+    assert(add_two_numbers(-1, 1) == 0);
+    assert(add_two_numbers(0, 0) == 0);
+    assert(add_two_numbers(100, 200) == 300);
+    std::cout << "All tests passed!" << std::endl;
+}
+

cpp/tests/easy_tests/add_two_numbers/test_add_two_numbers.h

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+#ifndef TEST_ADD_TWO_NUMBERS_H
+#define TEST_ADD_TWO_NUMBERS_H
+
+void test_add_two_numbers();
+
+#endif // TEST_ADD_TWO_NUMBERS_H

cpp/tests/easy_tests/test_easy.cpp

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+#include "test_easy.h"
+
+#include "add_two_numbers/test_add_two_numbers.h"
+
+void test_easy()
+{
+    test_add_two_numbers();
+}

cpp/tests/easy_tests/test_easy.h

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+#ifndef TEST_EASY_H
+#define TEST_EASY_H
+
+void test_easy();
+
+#endif // TEST_EASY_H

cpp/tests/hard_tests/test_hard.cpp

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+#include "test_hard.h"
+
+void test_hard()
+{
+
+}

cpp/tests/hard_tests/test_hard.h

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+void test_hard();

cpp/tests/medium_tests/test_medium.cpp

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+#include "test_medium.h"
+
+void test_medium()
+{
+
+}

cpp/tests/medium_tests/test_medium.h

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+void test_medium();

cpp/tests/test.cpp

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+#include "easy_tests/test_easy.h"
+#include "medium_tests/test_medium.h"
+#include "hard_tests/test_hard.h"
+
+int main() {
+    test_easy();
+    test_medium();
+    test_hard();
+    return 0;
+}