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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;
  10. 		cin >> n;
  11. 		vector<int> v;
  12. 		for(int i=0;i<n;i++)
  13. 		{
  14. 			int a;
  15. 			cin >> a;
  16. 			v.push_back(a);
  17. 		}
  18. 		bool ispos = true;
  19. 		for(int i=0;i<n;i++)
  20. 		{
  21. 			if(v[i]<=2*(max(i,n-i-1)));
  22. 			{
  23. 				ispos = false;
  24. 				break;
  25. 			}
  26. 		}
  27. 		if(ispos) cout << "YES" << endl;
  28. 		else cout << "NO" << endl;
  29. 	}
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
5
2
4 10
2
2 2
3
4 10 5
3
5 3 5
5
12 13 25 17 30
stdout 
NO
NO
NO
NO
NO
https://ideone.com/UYbAaZ
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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