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

int f1(unsigned size)
{
    double *x = malloc(size * sizeof(double));
    int *y = malloc(size * sizeof(int));
    double *res = malloc(size * sizeof(double));
    for(unsigned i = 0; i < size; ++i)
    {
        x[i] = y[i] = i;
        res[i] = x[i] + y[i];
    }
    free(x);
    free(y);
    free(res);
    return EXIT_SUCCESS;
}

int f2(unsigned size, void *memory)
{
    double *x = (double*)memory;
    int *y = (int*)memory + size;
    double *res = (double*)memory + 2*size;
    for(unsigned i = 0; i < size; ++i)
    {
        x[i] = y[i] = i;
        res[i] = x[i] + y[i];
    }
    return EXIT_SUCCESS;
}

int main()
{
    unsigned size = 10, repeat = 10;
    void *memory = malloc(2*size*sizeof(double) + size*sizeof(int));
    clock_t beg, end;
    for(unsigned i = 0; i < 10; ++i)
    {
        beg = clock();
        for(unsigned i = 0; i < repeat; ++i)
            f1(size);
        end = clock();
        printf("%f\t", (double)(end - beg) / CLOCKS_PER_SEC);
        beg = clock();
        for(unsigned i = 0; i < repeat; ++i)
            f2(size, memory);
        end = clock();
        printf("%f\n", (double)(end - beg) / CLOCKS_PER_SEC);
    }
}

/**** Error in `main': malloc(): memory corruption (fast): 0x00000000013470e0 ****/