/**
 * Return an array of arrays of size *returnSize.
 * Note: The returned array must be malloced, assume caller calls free().
 */
int** permute(int* nums, int numsSize, int* returnSize) {
    for(int i = 0; i < numsSize; i++) {
		backtracking(nums, i + 1, numsSize, returnSize);
	}
}

void backtracking(int* nums, int start, int numsSize, int* returnSize)
{
	if(start == numsSize) return;
	else if(start = numsSize -1) {
		//add all to result
	} else
		backtracking(nums, i + 1, numsSize, returnSize);
}