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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. vector<int>ps(vector<int>&arr){
  4.     vector<int>pref(arr.size()+1,0);
  5.     for(int i=1;i<=arr.size();i++){
  6.     	pref[i]=pref[i-1]+arr[i-1];
  7.     }
  8.     return pref;
  9. }
  10. int main(){
  11.     vector<int>arr={2,4,6,8};
  12.     vector<int>pref=ps(arr);
  13.     cout<<pref[3]-pref[0]<<"\n";  // sum[1,3] = 12
  14.     return 0;
  15. }
  16.  
Success #stdin #stdout 0.01s 5276KB
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stdin
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Standard input is empty
stdout
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12
https://ideone.com/nMU6Hd
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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