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  1. #include <bits/stdc++.h>
  2. #define int long long
  3. using namespace std;
  4.  
  5. int f(int u,vector<int> &v,vector<int> adj[],int n){
  6. 	int t=false;
  7. 	for(int i=1;i<=n;i++){
  8. 		if(i==u)continue;
  9. 		if(v[i]!=v[u]){
  10. 			adj[i].push_back(u);
  11. 			t=true;
  12. 			break;
  13. 		}
  14. 	}
  15. 	if(!t){
  16. 		return -1;
  17. 	}
  18. 	return 0;
  19. }
  20.  
  21. void solve() {
  22.     int n;
  23.     cin >> n;
  24.     vector<int> v(n+1);
  25.     for(int i=1;i<=n;i++){
  26.     	cin>>v[i];
  27.     }
  28.     vector<int> adj[n+1];
  29.     for(int i=2;i<=n;i++){
  30.     	int k=f(i,v,adj,n);
  31.     	if(k==-1){
  32.     		cout<<"NO"<<endl;
  33.     		return;
  34.     	}
  35.     }
  36.     cout<<"YES"<<endl;
  37.     for(int i=1;i<=n;i++){
  38.     		for(int k:adj[i]){
  39.     			cout<<i<<" "<<k<<endl;
  40.     		}
  41.     }
  42.  
  43.  
  44. }
  45.  
  46. signed main() {
  47.     int t;
  48.     cin >> t;
  49.     while (t--) {
  50.         solve();
  51.     }
  52.     return 0;
  53. }
  54.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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4
5
1 2 2 1 3
3
1 1 1
4
1 1000 101 1000
4
1 2 3 4
stdout
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YES
1 2
1 3
1 5
2 4
NO
YES
1 2
1 3
1 4
YES
1 2
1 3
1 4
https://ideone.com/O6RHn6
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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