uva 575 - Skew Binary

#include<cstdio>#include<cstring>#include<cmath>int main(){    #ifdef LOCAL    freopen("in.txt","r",stdin);    #endif // LOCAL    char str[35];    while(gets(str))    {        if(str[0]=='0'&&str[1]=='\0')break;        int len_str = strlen(str);        int t = pow(2,len_str);        int sum = 0;        for(int i = 0; i < len_str; i++)        {            sum += (str[i]-'0')*(t-1);            t/=2;        }        printf("%d\n",sum);    }    return 0;}