OpenMP并行编程（#pragma omp parallel for）

    clock_t t1 = clock();
    for (int i = 0; i<100; i++)
        SumForNumber();
    clock_t t2 = clock();
    std::cout << "Serial time: " << t2 - t1 << std::endl;

    clock_t t1 = clock();
#pragma omp parallel for
    for (int i = 0; i<100; i++)
        SumForNumber();
    clock_t t2 = clock();
    std::cout << "Parallel time: " << t2 - t1 << std::endl;