fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define MOD 1000000007
  4. #define LL long long
  5. #define out(x) cout << #x << " : " << x << "\n";
  6.  
  7. int main() {
  8.    ios_base::sync_with_stdio(false); cin.tie(NULL);
  9.    LL n; cin >> n;
  10.    LL k = floor(log10(n)) + 1;
  11.    LL p = pow(10, k);
  12.    double p2 = 1.0;
  13.    for(LL i = 0;i <= 100000000;i++) {      
  14.       while(p2 >= p) p2 /= 10;
  15.       if((LL)(p2) == n) {
  16.          cout << i << endl;
  17.          return 0;
  18.       }
  19.       p2 = p2 * 2ll;
  20.    }
  21.    cout << -1 << endl;
  22.    return 0;               
  23. }
Success #stdin #stdout 0s 3276KB
comments (?)
stdin
copy 
82
stdout
copy 
209
https://ideone.com/znGXdI
language:
C++ (gcc 8.3)
created:
9 years 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!