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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n; cin >> n;
  6. 	vector<int> arr(n);
  7. 	for(int i = 0; i < n; i++)
  8. 	cin >> arr[i];
  9.  
  10. 	unordered_map<int,vector<pair<int,int>>> mp;
  11. 	vector<vector<int>> res;
  12. 	for(int k = 2; k < n-1; k++){
  13. 		int j = k-1;
  14. 		for(int i = 0; i < j; i++){
  15. 			int sum = arr[i]+arr[j];
  16. 			mp[sum].push_back({i,j});
  17. 		}
  18. 		for(int l = k+1; l < n; l++){
  19. 			int target = -1*(arr[k]+arr[l]);
  20. 			if(mp.find(target)!=mp.end()){
  21. 				vector<pair<int,int>> temp = mp[target];
  22. 				for(int x = 0; x < temp.size(); x++){
  23. 					cout << temp[x].first << " " << temp[x].second << " " << k << " " << l << endl;
  24. 				}
  25. 			}
  26. 		}}
  27.  
  28.  
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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7
1 2 3 4 -1 -2 -2
stdout
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0 1 4 5
0 1 4 6
0 2 5 6
https://ideone.com/AFZaCr
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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