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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int t;
  6. 	cin >> t;
  7. 	while(t--)
  8. 	{
  9. 		int n,c=0;
  10. 		cin >> n;
  11. 		vector<int> v(n);
  12. 		for(int i=0;i<n;i++)
  13. 		{
  14. 			cin >> v[i];
  15. 		}
  16. 		sort(v.begin(),v.end());
  17. 		for(int i=0;i<n-1;i++)
  18. 		{
  19. 			if(v[i]<v[i+1])
  20. 			{
  21. 				c++;
  22. 			}
  23. 		}
  24. 		if(c==n-1 )
  25. 		{
  26. 			cout << "YES" << endl;
  27. 		}
  28. 		else
  29. 			 cout << "NO" << endl;
  30. 	}
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
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3
4
1 1 1 1
5
8 7 1 3 4
1
5
stdout
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NO
YES
YES
https://ideone.com/TZzcDz
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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