shit.c

#include <stdio.h>
#include <math.h>
#include <time.h>

int main()
{
    clock_t start_time = clock();
    for (int N = 2e7; N <= 2e8; N += 2e7)
    {
        double sum = 0,
        sum_cor = 0,
        cor = 0;
        for (double n = 1; n <= N; ++n)
        {
            double f = sqrt((7 + 3*n) / (5 + n));
            double fcor = f - cor;
            //сумма с коррекцией
            double temp_sum = sum_cor;
            sum_cor += fcor;
            cor = (sum_cor - temp_sum) - fcor;

            //простая сумма
            sum += f;
        }
        printf("%9d%18.4f%18.4f%10.4f\n", N, sum, sum_cor, sum - sum_cor);
    }
    clock_t end_time = clock();
    double execution_time = (end_time - start_time) / (double)CLK_TCK;
    printf("Time of execution: %lfs", execution_time);
    return 0;
}