题解 | #提取不重复的整数#

import  java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int num=sc.nextInt();
        if(num%10==0){
            return;
        }
        LinkedHashSet<Integer> lhs=new LinkedHashSet<Integer>();
        while(num/10!=0){            
             lhs.add(num%10);
             num=num/10;
             if(num<10){
                lhs.add(num);
             }
        }
        Iterator it=lhs.iterator();
        while(it.hasNext()){
            System.out.print(it.next());
        }

    }
}