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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define fast ios::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL) 
  4. #define ll long long  
  5. #define vll vector<long long>
  6. #define pii pair<int,int> 
  7. #define vpii vector<pair<int,int>> 
  8. #define pll  pair<long long ,long long > 
  9. #define pb  push_back
  10. #define ff  first 
  11. #define sec second  
  12. #define SORT(a) sort(a.begin(),a.end()) 
  13. #define m_p make_pair
  14. #define all(x)   (x.begin(),x.end()) 
  15. #define sz(v)     ((int)(v.size()))
  16. #define INF 1e9+7
  17. typedef vector<int> vi ;
  18. const int MOD=1e9 +7 ;
  19. int size=10000000; 
  20.  
  21.  
  22. int main(){
  23.  
  24. 	fast;
  25. 	int n ; 
  26. 	cin>>n; 
  27. 	vector<int> v(n);
  28. 	for(int i=0 ;i<n;i++){
  29. 		cin>>v[i]; 
  30. 	}
  31. 	int mx=0;  
  32. 	vector<pii> store; 
  33. 	int start=0; int end=0; 
  34.  
  35. 	for(int i=0;i<n-1;i++){
  36.  
  37. 		if( v[i]<v[i+1]){
  38. 			end++; 	
  39. 		}
  40. 		else{
  41. 			store.pb(make_pair(start,end));
  42. 			start=end+1;
  43. 			end=start;  
  44. 		}
  45. 	}
  46.     if(v[n-1]>v[n-2]) store.pb(make_pair(start,end));
  47. 	mx=max(mx, store[0].sec - store[0].ff + 1 );
  48.  
  49. 	for(int i=0;i<store.size();i++){
  50. 			if(i+1<store.size() && store[i+1].ff-1==store[i].sec && v[store[i].sec-1]<v[store[i+1].ff]){
  51. 				mx=max(mx,store[i+1].sec-store[i].ff); 
  52. 			}
  53.             else if(i+1<store.size()&&store[i+1].ff-1==store[i].sec&&v[store[i].sec]<v[store[i+1].ff+1]){
  54.                 mx=max(mx,store[i].sec+store[i+1].sec-store[i+1].ff-store[i].ff+1);
  55.             }
  56. 			else{
  57. 				mx=max(mx, store[i].sec - store[i].ff + 1 );
  58. 			}
  59. 	}
  60.  
  61. 	/*
  62. 	for(int i=0;i<store.size();i++){
  63. 		cout<<store[i].ff<<" "<<store[i].sec<<endl;
  64. 	}
  65.   	*/
  66.  
  67. 	cout<<mx<<endl;
  68.   	return 0; 
  69. }
  70.  
Success #stdin #stdout 0s 4524KB
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https://ideone.com/UzuBaY
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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