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

void * array_foo(int len1, int len2, int len3) {
    int(* arr)[len1][len2][len3] = malloc(sizeof(int)* len1 * len2 * len3);
    int i, j, k;
    for (i = 0; i < len1; i++) {
        for (j = 0; j < len2; j++) {
            for (k = 0; k < len3; k++) {
                (*arr)[i][j][k] = i*j*k;
            }
        }
    }
    return arr;
}
int main(int argc, char *argv[]) {
    srand(time(NULL));
    int len1 = rand() % 500;
    int len2 = rand() % 500;
    int len3 = rand() % 500;
    int (*arr)[len1][len2][len3] = array_foo(len1, len2, len3);

    int i, j, k;
    for (i = 0; i < len1; i++) {
        for (j = 0; j < len2; j++) {
            for (k = 0; k < len3; k++) {
                assert((*arr)[i][j][k] == i*j*k);
            }
        }
    }
    free(arr);
    return 0;
}