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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. int x[100050],dp1[100050],dp2[100050],n,m,maxx=-1e9-10,ans;
  5. signed main(){
  6. 	ios::sync_with_stdio(false);
  7. 	cin.tie(0),cout.tie(0);
  8. 	cin>>n;
  9. 	for(int i=1;i<=n;i++){
  10. 		cin>>x[i];
  11. 	}
  12. 	for(int i=1;i<=n;i++){
  13. 		dp1[i]=1;
  14. 		dp2[i]=1;
  15. 	}
  16. 	int e;
  17. 	for(int i=1;i<=n;i++){
  18. 		for(int j=1;j<=i-1;j++){
  19. 			if(x[i]>x[j]){
  20. 				if(dp1[j]+1<dp1[i]){
  21. 					ans++;
  22. 				}
  23. 				dp1[i]=max(dp1[i],dp1[j]+1);
  24. 				ans++;
  25. 				e=i;
  26. 			}
  27. 		}
  28. 	}
  29. 	for(int i=n;i>=e;i--){
  30. 		for(int j=i;j<=n;j++){
  31. 			if(x[i]<x[j]){
  32. 				if(dp2[j]+1>dp2[i]){
  33. 					ans++;
  34. 				}
  35. 				dp2[i]=max(dp2[i],dp2[j]+1);
  36.  
  37. 			}
  38. 		}
  39. 	}
  40. 	cout<<ans-1;
  41. 	return 0;
  42. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/xpYdwA
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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