C time

#include <iostream>
#include <ctime>
#include <ratio>
#include <chrono>

using namespace std;
using namespace chrono;


int main () {
    high_resolution_clock::time_point t1 = high_resolution_clock::now();

    // прога

    high_resolution_clock::time_point t2 = high_resolution_clock::now();
    duration<double> time_span = duration_cast< duration<double> >(t2 - t1);
    cout << endl << "It took me " << time_span.count() << " seconds" << endl;
}