fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.    int n ;
  7.    cin >>n;
  8.    long long sum = n *(n+1)/2;
  9.  
  10.    long long f=1;
  11.    while(f<=n)
  12.    {
  13.      sum-=(2*f);
  14.      f*=2;
  15.      }
  16.    cout << sum << endl;
  17.  
  18.  
  19.  
  20.    }
  21.  
  22.  
  23.  
  24.  
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin
copy 
2
stdout
copy 
-3
https://ideone.com/M93L3i
language:
C++14 (gcc 8.3)
created:
4 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!