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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. int32_t main() {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(nullptr), cout.tie(nullptr);
  8.  
  9.     int n, v;
  10.     cin >> n >> v;
  11.     if (n-1 <= v) {
  12.         cout << n-1 << endl;
  13.         return 0;
  14.     }
  15.     int result = v - 1;
  16.     for(int i = 1; i <= n - v; ++i) {
  17.         result += i;
  18.     }
  19.     cout << result << endl;
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0s 15232KB
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https://ideone.com/hxF5jk
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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