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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5.  
  6. void solve(){
  7.     int n,k,s=0,mx=INT_MIN;
  8.     cin>>n;
  9.     vector<int>v(n);
  10.     for(int i=0;i<n;i++)cin>>v[i];
  11.     cin>>k;
  12.     for(int i=0;i<k;i++){
  13.         s+=v[i];
  14.     }
  15.     mx=max(mx,s);
  16.     int a=k;
  17.     for(int i=n-1;i>=n-a;i--){
  18.         s+=v[i];
  19.         s-=v[k-1];
  20.         k--;
  21.         mx=max(mx,s);
  22.     }
  23.     cout<<mx<<"\n";
  24. }
  25.  
  26. int main(){
  27.     ios_base::sync_with_stdio(false);
  28.     cin.tie(NULL);
  29.     solve();
  30.     return 0;
  31. }
Success #stdin #stdout 0.01s 5328KB
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https://ideone.com/T4eu8K
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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