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  1. #include <bits/stdc++.h>
  2.  
  3. using ll = long long;
  4.  
  5. #define endl '\n'
  6. #define fi first
  7. #define sec second
  8. #define pb push_back
  9. #define sz(v) (int)(v).size()
  10. #define all(v) (v).begin(), (v).end()
  11.  
  12. using namespace std;
  13.  
  14. const int maxn = (int)1e5;
  15.  
  16. int a[maxn + 5];
  17. ll dp[maxn + 5];
  18. deque<int> dq;
  19. int n, k;
  20.  
  21. int main(){
  22. 	// YEU CAM TU :>
  23.     ios_base::sync_with_stdio(0);
  24.     cin.tie(0);
  25.     cin >> n >> k;
  26.     for(int i = 1; i <= n; i++){
  27.         cin >> a[i];
  28.     }
  29.     dq.push_back(0);
  30.     for(int i = 1; i <= n; i++){
  31.         while(!dq.empty() && dq.front() < i - k) dq.pop_front();
  32.         dp[i] = dp[dq.front()] + a[i];
  33.         while(!dq.empty() && dp[dq.back()] >= dp[i]) dq.pop_back();
  34.         dq.push_back(i);
  35.     }
  36.     ll ans = 0, total = accumulate(a + 1, a + n + 1, 0LL);
  37.     for(int i = n - k + 1; i <= n; i++){
  38.         ans = max(ans, total - dp[i]);
  39.     }
  40.     cout << ans;
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/zx2G0D
language:
C++14 (gcc 8.3)
created:
20 hours ago
visibility:
public

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