ParProg2 (1.1)

// https://drive.google.com/drive/folders/1GK3t7PBsRFQp01ApEmk1wb6Scrw_CFA4?usp=sharing

#include <iostream>
#include <vector>
#include <ctime>
#include <cmath>
#include <ppl.h>
using namespace std;

#define N 200
#define EPS 1e-9

double fun(double x)
{
	double ans = 0;

	for (int k = 1; k <= max(20, int(20 * fabs(x))); ++k)
		for (int j = 1; j <= max(20, int(20 * fabs(x))); ++j)
		{
			double x_2 = x * x;

			ans += x_2 * (k + j) / (x_2 + k * k * k + j * j * j) * cos(k * x) * sin(j * x);
		}

	return ans;
}

double res1[N + 7], res2[N + 7];

int main()
{
	setlocale(LC_ALL, "Russian");

	auto t_start = clock();

	for (int i = 1; i <= N; ++i)
		res1[i] = fun(100 * cos(i));

	auto t_end = clock();

	double time1 = 1.0 * (t_end - t_start) / CLOCKS_PER_SEC;

	cout << "Последовательная реализация: " << time1 << "\n";

	t_start = clock();

	concurrency::parallel_for(1, N + 1, [](size_t i) {res2[i] = fun(100 * cos(i)); });

	t_end = clock();

	double time2 = 1.0 * (t_end - t_start) / CLOCKS_PER_SEC;

	cout << "Параллельная реализация: " << time2 << "\n";

	cout << "Разница во времени: " << time1 / time2 << "\n";

	return 0;
}