#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <malloc.h>
#define N 4
#define LINE 10

int main(void)
{
    int **array;
    int i;

    array = malloc(sizeof(int) * N);
    for (i=0;i<N;i++)
    {
        array[i] = malloc(sizeof(int) * LINE);
    }

    for (i=0;i<N;i++)
    {
        array[i] = realloc(array[i], sizeof(int) * LINE * 2);
    }

    return 0;
}