动态创建二维数组

// 动态创建gridSize行，gridColSize列的二维数组
int gridSize = 3;
int gridColSize = 5;
int **grid = (int **)malloc(sizeof(int *) * gridSize);
for (int i = 0; i < gridSize; i++) {
	grid[i] = (int *)malloc(sizeof(int) * gridColSize);
}
// 释放资源
for (int i = 0; i < gridSize; i++) {
		free(grid[i]);
}
free(grid);