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#include <iostream>
#include <stdlib.h>
#include <cstring>
using namespace std;

// alloc 2d array
int main() {
	int *a = (int*)malloc(sizeof(int)*16);
	memset(a, 0, sizeof(int)*16);

	// case 2
	int a[4][4];
	memset(a, 0, sizeof(int)*16;

	// case 3, alloc mem for char a[10][20]
	char **a;
	a = (char**)malloc(10*sizeof(char*));
	for(int i=0; i<10; i++)
		a[i] = (char*)malloc(sizeof(char)*20);

}