fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   // Input
  6.   int n; cin >> n;
  7.  
  8.   // Process -> Output
  9.   if (n % 2 == 0) --n;
  10.   cout << ((long long)n + 1)*((n - 1)/2 + 1) / 2;
  11.  
  12.   return 0;
  13. }
  14.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
100
stdout
copy 
2500
https://ideone.com/UUcMG8
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!