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  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.    long long f=1;
  10.    while(f<=n)
  11.    {
  12.      sum-=(f*2);
  13.      f*=2;
  14.      }
  15.    cout << sum << endl;
  16.  
  17. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/v8LWOO
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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