Oct 9, 2018 · Oct 9, 2018 · Oct 9, 2018
diff --git a/solution/046.Permutations/Solution.cpp b/solution/046.Permutations/Solution.cpp
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,35 @@
	class Solution {
	public:
	vector<vector<int>> permute(vector<int>& nums) {
	if (nums.size() == 0) return{};
	vector<vector<int>> res;
	vector<int> curr_vec;
	vector<bool> used;
	for (int i = 0; i < nums.size(); i++)
	{
	used.push_back(false);
	}
	dfs(res, nums, 0, curr_vec, used);
	return res;
	}

	void dfs(vector<vector<int>>& res, vector<int>& nums, int depth, vector<int> curr_vec, vector<bool> used)
	{

	if (depth >= nums.size())
	{
	res.emplace_back(curr_vec);
	return;
	}

	for (int i = 0; i < nums.size(); i++)
	{
	if (used[i]) continue;
	used[i] = true;
	curr_vec.emplace_back(nums[i]);
	dfs(res, nums, depth + 1, curr_vec, used);
	curr_vec.pop_back();
	used[i] = false;
	}
	}
	};