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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3.  
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8. 	// your code goes here
  9. 	int n,k;
  10. 	cin>>n>>k;
  11. 	vector<int> prefix(n,0);
  12. 	vector<int> arr(n);
  13. 	for(int i=0;i<n;i++){
  14. 		cin>>arr[i];
  15. 		if(i==0){
  16. 			prefix[i]=arr[i];
  17. 		}
  18. 		else{
  19. 		   prefix[i]=max(arr[i],prefix[i-1]+arr[i]);
  20. 		}
  21. 	}
  22. 	int sum=0;
  23.     int i=0;
  24.     int j=0;
  25.     int ans=0;
  26.  
  27.     while(i<n && j<n){
  28.     	sum = sum+arr[j];
  29.     	if(j-i+1>k){
  30.     		sum=sum-arr[i];
  31.     		i++;
  32.     	}
  33.     	if(j-i+1==k){
  34.     		int res=sum;
  35.     		if(i!=0){
  36.     		res = max(res,prefix[i-1] + sum);
  37.     		}
  38.     		ans = max(ans,res);
  39.     	}
  40.     	j++;
  41.     }
  42.  
  43.     cout<<ans<<endl;
  44.  
  45.  
  46.  
  47. 	return 0;
  48. }
Success #stdin #stdout 0.01s 5308KB
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stdout
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9
https://ideone.com/lNW538
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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