第9讲5*

class Solution {
public:
    vector<vector<int>> permutation(vector<int>& nums) {
        sort(nums.begin(), nums.end()); 

        vector<vector<int>> res;
        do
        {
            res.push_back(nums);
        }while(next_permutation(nums.begin(), nums.end()));

        return res;
    }
};