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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int arr[]= {0, 1, 2, 3, 4, 5, 6, 7, 8};
  6. 	int n=sizeof(arr)/sizeof(arr[0]);
  7. 	int l=3,r=7;
  8. 	int prefix[n]={0};
  9. 	prefix[0]=arr[0];
  10. 	for(int i=1;i<n;i++)
  11. 		prefix[i]=prefix[i-1]+arr[i];
  12. 	cout<<prefix[r]-prefix[l-1];
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
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stdin 
Standard input is empty
stdout 
25
https://ideone.com/9c7c0T
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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