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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. typedef long long ll;
  5. ll pow2(int a)
  6. {
  7.     if(a)return 1<<a;
  8.     return 1;
  9. }
  10. ll pow3(int a)
  11. {
  12. 	if(a)return 1<<a;
  13. 	return 0;
  14. }
  15. ll f(string x)
  16. {
  17.     ll j;
  18.     if(x=="0")return 1;
  19.     if(x=="1")return 2;
  20.     if(x[0]=='0')j=(1<<((int)x.length()))-2;
  21.     else j=(1<<((int)x.length()-1))+(1<<((int)x.length()))-2;
  22.     j++;
  23.     reverse(x.begin(),x.end());
  24.     int l=x.length()-1;
  25.     for(int i=0;i<l;i++)
  26.         if(x[i]=='1')j+=pow2(i);
  27.     return j;
  28. }
  29.  
  30.  
  31. int main()
  32. {
  33.     char ch;
  34.     string s="";
  35.     while(cin>>ch)ch=='4' ? s+='0' : s+='1';
  36.     cout<<f(s);
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0s 3280KB
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https://ideone.com/DbvTzc
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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