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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	ios_base::sync_with_stdio(false); 
  7.     cin.tie(NULL);
  8.  
  9. 	long n;
  10. 	long max;
  11. 	cin>>n;
  12. 	long A[n];
  13. 	for(long i=0;i<n;i++){
  14. 		cin>>A[i];
  15. 	}
  16. 	max=A[0];
  17. 	for(long i=0,j=n-1;i<n/2;i++,j--){
  18. 		if(A[i]>=max){
  19. 			if(A[i]<=A[j])
  20. 				max=A[j];
  21. 			else{
  22. 			    cout<<"no";
  23. 			    return 0;
  24. 			}
  25. 		}
  26. 		else {
  27. 			cout<<"no";
  28. 			return 0;
  29. 		}
  30.  
  31. 	}
  32. 	cout<<"yes";
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 4348KB
comments (?)
stdin
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7
-2 -2 14 20 18 12 -1
stdout
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no
https://ideone.com/pe6dQN
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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