leetcode516_leetcode46

class Solution {
public:
	vector<vector<int>> permute(vector<int>& nums) {
		vector<vector<int>> res;
		vector<int> path;
		scan( nums, path, res);
		return res;

	}
	void scan(vector<int>& nums, vector<int>& path, vector<vector<int>> &res){
		if (path.size() == nums.size()){
			res.push_back(path);
			return;
		}

		for (int i = 0; i < nums.size(); i++){
			if (find(path.begin(),path.end(), nums[i]) == path.end()){
				path.push_back(nums[i]);
				scan(nums, path, res);
				path.pop_back();
			}
		}
	}
};