循环数 java 题解

主要用到了大整数和字符串操作，s+=s,实现左右子串可能，再用String的contains函数进行求解
import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        BigInteger b=new BigInteger(s);
        String s2="";
        s2=s+s;
        int flag=1;
        for(int i=1;i<=s.length();i++)
        {
            BigInteger b1=b.multiply(new BigInteger(String.valueOf(i)));
            String s1=b1.toString();
            if(s2.contains(s1)==true)
            {
                continue;
            }
            else
            {
                flag=0;
                break;
            }
        }
        if(flag==1) System.out.println(1);
        else System.out.println(0);
    }
}