/**
 * Return an array of size *returnSize.
 * Note: The returned array must be malloced, assume caller calls free().
 */
//返回一维数组, returnSize是指向size的指针
int* func(int rowIndex, int* returnSize) {
	int *r=(int *)malloc(sizeof(int )*(rowIndex));
    *returnSize=rowIndex;
}

/**
 * Return an array of arrays.
 * The sizes of the arrays are returned as *columnSizes array.
 * Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
 */
//返回二维数组, columnSizes是指向数组的指针, 数组中存放size
int** generate(int numRows, int** columnSizes) {
	int** r=(int **)malloc(sizeof(int *)*numRows);    
	int *s=(int *)malloc(sizeof(int )*x); 
	r[i]=s;
	//*columnSizes是数组, (*columnSizes)[i]是数组元素
    *columnSizes=(int *)malloc(sizeof(int )*numRows);
    (*columnSizes)[i]=i;    
}