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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n; cin >> n;  int b; cin >> b;
  6. 	vector<int> arr(n);
  7. 	for(int i = 0; i < n; i++)
  8. 	cin >> arr[i];
  9.  
  10. 	int sum = 0; 
  11. 	for(int i = 0; i < b; i++)
  12. 	sum += arr[i];
  13.  
  14. 	int maxs = sum;
  15. 	for(int i = 1; i <= b; i++){
  16. 		sum = sum - arr[b-i] + arr[n-i];
  17. 		maxs = max(maxs, sum);
  18. 	}
  19. 	cout << maxs;
  20. 	return 0;
  21. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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5 3
5 -2 2 1 3
stdout
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9
https://ideone.com/OrytPQ
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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