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  1. #include<bits/stdc++.h>
  2. #define ll long long int
  3.  
  4. #define print(a)        for (auto x : a) cout << x << " "; cout << endl
  5. #define print_upto(a,n)        for(int i=0;i<n;i++)    cout<<a[i]<<" "; cout<<endl
  6. #define take(x,n)           for(int i=0;i<n;i++)  cin>>x[i];
  7.  
  8. #define watch(x) cout << (#x) << " is " << (x) << "\n"
  9. #define watch2(x,y) cout <<(#x)<<" is "<<(x)<<" and "<<(#y)<<" is "<<(y)<<"\n"
  10.  
  11. using namespace std;
  12.  
  13. ll a[1000008];
  14. ll dp[1000008];
  15.  
  16. int main() {
  17.  
  18. 	ios_base::sync_with_stdio(false);
  19. 	cin.tie(0);
  20. 	cout.tie(0);
  21.  
  22. #ifndef ONLINE_JUDGE
  23. 	freopen("input.txt", "r", stdin);
  24. 	freopen("output.txt", "w", stdout);
  25. 	freopen("error.txt" , "w" , stderr);
  26. #endif
  27.  
  28. 	ll n;
  29. 	cin >> n;
  30.  
  31.  
  32. 	for (ll i = 1; i <= n; i++) {
  33. 		cin >> a[i];
  34. 	}
  35.  
  36. 	for (ll i = 1; i + 2 <= n; i++) {
  37. 		dp[i] = 1;
  38. 		if (a[i + 1] > a[i + 2] && dp[i - 1] == 0) {
  39. 			dp[i + 1] = 1;
  40. 			continue;
  41. 		} else {
  42. 			dp[i + 2] = 1;
  43. 			i++;
  44. 		}
  45. 	}
  46.  
  47. 	if (dp[n - 2] == 0) {
  48. 		dp[n - 1] = 1;
  49. 		dp[n] = 1;
  50. 	}
  51.  
  52. 	ll ans = 0;
  53. 	for (ll i = 0; i <= n; i++) {
  54. 		if (dp[i] == 1) {
  55. 			ans += a[i];
  56. 		}
  57. 	}
  58.  
  59. 	cout << ans << "\n";
  60.  
  61.  
  62. 	return 0;
  63. }
Time limit exceeded #stdin #stdout 5s 4396KB
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https://ideone.com/zZmgtb
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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