UVa/575 - Skew Binary/575.2.cpp

   1 /*
   2   Problem: 575 - Skew simmetry (UVa)
   3   Author: Andrés Mejía-Posada
   4   (http://blogaritmo.factorcomun.org)
   5
   6  */
   7
   8 using namespace std;
   9 #include <algorithm>
  10 #include <iostream>
  11 #include <iterator>
  12 #include <sstream>
  13 #include <fstream>
  14 #include <cassert>
  15 #include <climits>
  16 #include <cstdlib>
  17 #include <cstring>
  18 #include <string>
  19 #include <cstdio>
  20 #include <vector>
  21 #include <cmath>
  22 #include <queue>
  23 #include <deque>
  24 #include <stack>
  25 #include <map>
  26 #include <set>
  27
  28 #define D(x) cout << #x " is " << x << endl
  29
  30 int main(){
  31
  32   string s;
  33   while (cin >> s && s != "0"){
  34     reverse(s.begin(), s.end());
  35     int ans = 0;
  36
  37     for (int i=0, b=1; i<s.size(); ++i, b = 2*b+1){
  38       ans += (s[i] - '0')*b;
  39     }
  40
  41     cout << ans << endl;
  42   }
  43
  44   return 0;
  45 }