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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. bool f(vector<int>&v,vector<int>&ds,int idx, int sum, int k){
  4. 	if(idx>=(int)v.size() || sum==k){
  5. 		if(sum==k) return true;
  6. 		return false;
  7. 	}
  8. 	sum=sum+v[idx];
  9. 	ds.push_back(v[idx]);
  10. 	bool ans = f(v,ds,idx+1,sum,k);
  11. 	if(ans==true)
  12. 	return ans;
  13. 	sum=sum-v[idx];
  14. 	ds.pop_back();
  15. 	ans = f(v,ds,idx+1,sum,k);
  16. 	return ans;
  17. }
  18. int main() {
  19. 		vector<int> v = {3, 1, 2};
  20.     vector<int> ds;
  21.     // vector<vector<int>> ans;
  22. 	int sum=0;
  23.     cout<<f(v,ds,0,sum,3)<<endl;
  24.  
  25.     // for (const auto& seq : ans) {
  26.     //     for (int num : seq)
  27.     //         cout << num << " ";
  28.     //     cout << endl;
  29.     // }
  30. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/c0yDwL
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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