牛客网——skew数

链接：https://www.nowcoder.com/questionTerminal/5928127cc6604129923346e955e75984
来源：牛客网

import java.util.Scanner;
public class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String s = sc.next();
             
            int Num = 0;
            int len = s.length();
            for(int i = 0; i < len; i++){
                int k = (s.charAt(i)-‘0‘);
                Num += k*(Math.pow(2,len-i)-1);
            }
            System.out.println(Num);
        }
        sc.close();
    }
}