fork download 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.     int n ;
  7.     cin >>n;
  8.    int sum = n*(n+1)/2;
  9.     int f=1;
  10.     while(f<=n)
  11.     {
  12.         sum-=(f*2);
  13.  
  14.         f*=2;
  15.     }
  16.     cout << sum << endl;
  17.  
  18.  
  19. }
  20.  
  21.  
  22.  
  23.  
  24.  
  25.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
2
stdout 
-3
https://ideone.com/5kAUi1
language:
C++14 (gcc 8.3)
created:
1 day 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!