程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>

int **alloc(size_t);
void cleanup(int **, size_t);

int main(void)
{
    size_t n, i, j;
    int **p2Array;
   
    scanf("%u", &n);
    p2Array = alloc(n);
    if (p2Array == 0) {
        // TODO ...
        exit(EXIT_FAILURE);
    }
    for (i = 0; i < n; ++i)
        for (j = 0; j < n; ++j)
            scanf("%d", p2Array[i] + j);
    // TODO...
    cleanup(p2Array, n);
}

int **alloc(size_t n)
{
    size_t i;
    int **p2Array = calloc(n, sizeof(int *));
   
    for (i = 0; i < n; ++i)
        p2Array[i] = memset(calloc(n, sizeof(int)), 0, n * sizeof(int));
   
    return p2Array;
}

void cleanup(int **p2Array, size_t n)
{
    size_t i;

    for (i = 0; i < n; ++i)
        free(p2Array[i]);
    free(p2Array);
}