LeetCode – Refresh – Combination Sum

 1 class Solution {
 2 public:
 3     void getComb(vector<vector<int> > &result, const vector<int> &num, vector<int> current, int sum, int target, int start) {
 4         if (sum == target) {
 5             result.push_back(current);
 6             return;
 7         }
 8         if (sum > target) {
 9             return;
10         }
11         for (int i = start; i < num.size(); i++) {
12             current.push_back(num[i]);
13             getComb(result, num, current, sum + num[i], target, i);
14             current.pop_back();
15         }
16     }
17     vector<vector<int> > combinationSum(vector<int> &candidates, int target) {
18         vector<vector<int> > result;
19         sort(candidates.begin(), candidates.end());
20         getComb(result, candidates, vector<int> (), 0, target, 0);
21         return result;
22     }
23 };