cpp_code = """
#include <iostream>
#include <thread>
#include <vector>
#include <atomic>

const int INCREMENTS_PER_THREAD = 100000;

//int counter = 0; // 这行是错的
__________

void increment() {
    for (int i = 0; i < INCREMENTS_PER_THREAD; ++i) {
        counter++; // 非原子操作
    }
}

int main() {
    int num_threads;
    std::cin >> num_threads;

    std::vector<std::thread> threads;

    // 创建多个线程同时对 counter 进行递增操作
    for (int i = 0; i < num_threads; ++i) {
        threads.emplace_back(increment);
    }

    // 等待所有线程完成
    for (auto& th : threads) {
        th.join();
    }

    // 输出最终的 counter 值
    std::cout << counter << std::endl;

    return 0;
}

"""

import os
import sys

def compile_and_run_cpp(cpp_code):
    
    cpp_filename = "main.cpp"
    executable = "./a.out"
    
    with open(cpp_filename, 'w') as file:
        file.write(cpp_code)

    compile_command = f"g++ {cpp_filename} -o {executable}"
    compile_result = os.system(compile_command)
    if compile_result != 0:
        print(f"Compile Error: Compilation failed", file=sys.stderr)
        sys.exit(1)

    run_command = f"{executable}"
    run_result = os.system(run_command)
    if run_result != 0:
        print(f"Runtime Error: Execution failed", file=sys.stderr)
        sys.exit(1)

if __name__ == "__main__":
    compile_and_run_cpp(cpp_code)