UVa 445 Marvelous Mazes

UVa 445 Marvelous Mazes

Here is my code:

#include < stdio.h >
#include < iostream >
#include < string >
using   namespace  std;

int  len;
string  s;

int  main()
{
     /*
    freopen("data.in","r",stdin);
    freopen("data.out","w",stdout);
    // */
     while (getline(cin,s))
    {
        len = s.length();
         for ( int  i = 0 ;i < len;i ++ )
        {
             int  counter = 0 ;
             while (s[i] >= ' 0 ' && s[i] <= ' 9 ' )
            {
                counter += (s[i] - ' 0 ' );
                i ++ ;
            }
             for ( int  j = 1 ;j <= counter;j ++ )
                cout << (s[i] == ' b ' ? '   ' :s[i]);
             if (s[i] == ' ! ' ) cout << endl;
        }
        cout << endl;
    }
return   0 ;
}