leetcode

0 class Solution {

1 public:

2 vector<vector<int>> subsets(vector<int> &nums) {

3 vector<vector<int>> res;

4

5 res.push_back({});

6 for (int num : nums) {

7 for (int i = res.size() - 1; i >= 0; i--) {

8 res.push_back(res[i]);

9 res.back().push_back(num);

10 }

11 }

12 return res;

13 }

14 };