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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int cnt=0;
  4. bool f(vector<int>&v,vector<int>&ds,int idx, int sum, int k){
  5. 	if(idx>=(int)v.size() || sum==k){
  6. 		if(sum==k) {
  7. 			cnt++;
  8. 			cout<<" count is "<<cnt<<endl;
  9. 			for(int i=0;i<ds.size();i++)
  10. 			cout<<ds[i]<<" ";
  11. 			cout<<endl;
  12. 			return true;}
  13. 		return false;
  14. 	}
  15. 	sum=sum+v[idx];
  16. 	ds.push_back(v[idx]);
  17. 	bool ans = f(v,ds,idx+1,sum,k);
  18. 	if(ans==true)
  19. 	return ans;
  20. 	sum=sum-v[idx];
  21. 	ds.pop_back();
  22. 	ans = f(v,ds,idx+1,sum,k);
  23. 	return ans;
  24. }
  25. int main() {
  26. 		vector<int> v = {3, 1, 2};
  27.     vector<int> ds;
  28.     // vector<vector<int>> ans;
  29. 	int sum=0;
  30.     cout<<f(v,ds,0,sum,3)<<endl;
  31.  
  32.     // for (const auto& seq : ans) {
  33.     //     for (int num : seq)
  34.     //         cout << num << " ";
  35.     //     cout << endl;
  36.     // }
  37. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/8wYGiE
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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