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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. int main() {
  7.         while(1){
  8. 	int n;
  9. 	cin>>n;
  10. 	if(n==0)
  11. 	        break;
  12. 	int arr[n+5];
  13.  
  14. 	for(int i=0;i<n;i++){
  15. 		cin>>arr[i];
  16. 	}
  17.  
  18. 	stack<int> s;
  19. 	s.push(arr[0]);
  20. 	int a[n+5],j=0;
  21. 	for(int i=1;i<n;i++){
  22. 		if(arr[i]>s.top()){
  23. 		        while(!s.empty()){
  24. 		              if(arr[i]>s.top()){
  25.  
  26. 		                 a[j] = s.top();
  27. 		                 //cout<<a[j];
  28. 			        s.pop();
  29. 			        j++;
  30. 		              }else{
  31. 		                s.push(arr[i]);
  32. 		                break;
  33. 		              }
  34.  
  35.  
  36. 		        }
  37.  
  38. 		        if(s.empty())
  39. 		               s.push(arr[i]); 
  40.  
  41. 		}else if(arr[i]>arr[i+1] && i!=n-1)
  42. 			s.push(arr[i]);
  43. 		else if(arr[i]<arr[i+1] && i!=n-1){
  44. 				a[j] = arr[i];
  45. 				//cout<<a[j];
  46. 				j++;
  47. 		}if(i==n-1){
  48. 			while(!s.empty()){
  49. 				if(arr[i]>s.top()){
  50. 					a[j] = s.top();
  51. 					//cout<<a[j];
  52. 					j++;
  53. 					s.pop();
  54. 				}else if(arr[i]<=s.top()){
  55. 						a[j] = arr[i];
  56. 						//cout<<a[j];
  57. 						j++;
  58. 						break;
  59. 					}
  60. 			}
  61. 		}
  62. 	}
  63.  
  64. 	while(!s.empty())
  65. 	{
  66. 	        a[j] = s.top();
  67. 	        //cout<<a[j];
  68. 	        j++;
  69. 		s.pop();
  70. 	}
  71.  
  72. 	sort(arr,arr+n);
  73. 	int i;
  74. 	for(i=0;i<n;i++){
  75. 	        if(arr[i] != a[i]){
  76. 	        cout<<"no"<<endl;
  77. 	        break;
  78. 	        }
  79. 	}
  80. 	if(i==n)
  81. 	        cout<<"yes"<<endl;
  82.  
  83.  
  84.  
  85. 	}
  86.  
  87.  
  88. 	return 0;
  89. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
copy 
5
2 3 1 4 5
5
2 3 1 5 4
5
2 3 4 1 5
5
2 3 4 5 1
5
2 3 5 1 4
5
2 3 5 4 1
5
2 4 1 3 5
5
2 4 1 5 3
5
2 4 3 1 5
5
2 4 3 5 1
5
2 4 5 1 3
5
2 4 5 3 1
5
2 5 1 3 4
5
2 5 1 4 3
5
2 5 3 1 4
5
2 5 3 4 1
5
2 5 4 1 3
5
2 5 4 3 1
5
3 1 2 4 5
5
3 1 2 5 4
5
3 1 4 2 5
5
3 1 4 5 2
5
3 1 5 2 4
5
3 1 5 4 2
5
3 2 1 4 5
5
3 2 1 5 4
5
3 2 4 1 5
5
3 2 4 5 1
5
3 2 5 1 4
5
3 2 5 4 1
0
stdout
copy 
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
yes
yes
no
no
no
no
yes
yes
no
no
no
no
https://ideone.com/giNo1a
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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