题解 | #提取不重复的整数#

import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
        int intPut = sc.nextInt();
        Set<Integer> resultSet = new LinkedHashSet<>();
        while (intPut / 10 != 0){
            int num = intPut % 10;
            resultSet.add(num);
            intPut = intPut / 10;
        }
        resultSet.add(intPut);

        Iterator<Integer> iterator = resultSet.iterator();
        while (iterator.hasNext()){
            System.out.print(iterator.next());
        }
    }
}