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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios_base::sync_with_stdio(false);
  6.     cin.tie(NULL);
  7.     cout.tie(NULL);
  8.  
  9.     long long n, m;
  10.     cin >> n >> m;
  11.  
  12.  
  13.     long long sum = (m - n + 1) * (n + m) / 2;
  14.  
  15.     cout << sum << endl;
  16. }
Success #stdin #stdout 0s 5324KB
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6 10
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40
https://ideone.com/c2Ru6C
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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