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  1. #include <iostream>
  2. #include<vector>
  3. using namespace std;
  4.  
  5. int main() {
  6.     int n=6;
  7.     vector<int>arr={1,2,3,4,5,6};
  8.     vector<int>prefix(n+1,0);
  9.     for(int i=1;i<=n;i++){
  10.         prefix[i]=arr[i]+prefix[i-1];
  11.     }
  12.     int l=2,r=4, sum=0;
  13.     sum=prefix[r]-prefix[l-1];
  14.     cout<<sum;
  15.     return 0;
  16. }
Success #stdin #stdout 0.01s 5280KB
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12
https://ideone.com/feesa8
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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