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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int arr[] = {1, 2, 3, 4, 5};
  6.     int n = 5;
  7.  
  8.     int prefix[5];
  9.     prefix[0] = arr[0];
  10.  
  11.     for(int i = 1; i < n; i++) {
  12.         prefix[i] = prefix[i - 1] + arr[i];
  13.     }
  14.  
  15.     int l = 1, r = 3;
  16.  
  17.     int sum;
  18.     if(l == 0)
  19.         sum = prefix[r];
  20.     else
  21.         sum = prefix[r] - prefix[l - 1];
  22.  
  23.     cout << sum << endl;
  24.  
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/mYZ4yJ
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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