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


typedef struct
{
    float a;
    float b;
    float c;
} Col;

int main()
{
    int width = 800;
    int height = 600;

    Col** array = malloc(width * sizeof(Col*));
    for (int i = 0; i!= width; i++)
    {
        array[i] = malloc(height * sizeof(Col));
    }

    for (int i = 0; i != width; i++)
    {
        for (int j = 0; j != height; j++)
        {
            array[i][j].a = 1;
            array[i][j].b = 2;
            array[i][j].c = 3;
        }
    }

    int start;
    while (1)
    {
        start = clock();

        Col* arrayPtr = NULL;

        for (int i = 0; i != width; i++)
        {
            arrayPtr = array[i];

            for (int j = 0; j != height; j++)
            {
                arrayPtr->a = (arrayPtr->b) * (arrayPtr->c);
                arrayPtr->b = (arrayPtr->a) * (arrayPtr->c);
                arrayPtr->c = (arrayPtr->a) * (arrayPtr->b);
                arrayPtr++;
            }
        }

        printf("%i\n", (int)((clock() - start)*1E3/CLOCKS_PER_SEC));
    }

    return 0;
}