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combination-sum.cpp
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25 lines (25 loc) · 885 Bytes
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class Solution {
public:
void helper(vector<int>& candidates, int target, vector<vector<int>> &ans,vector<int> &combination, int start){
if(target==0){
ans.push_back(vector<int> (combination.begin(), combination.end()));
return;
}
for(int i=start;i<candidates.size();i++){
if(candidates[i]>target){
break;
}
combination.push_back(candidates[i]);
helper(candidates, target-candidates[i],ans,combination,i);
combination.pop_back();
}
}
vector<vector<int>> combinationSum(vector<int>& candidates, int target) {
int n=candidates.size();
vector<vector<int>> ans;
vector<int> combination;
sort(candidates.begin(), candidates.end());
helper(candidates,target,ans,combination,0);
return ans;
}
};