题解 | #提取不重复的整数#

import java.util.LinkedList;
import java.util.Scanner;

// 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 num = sc.nextInt();
        LinkedList<Integer> intQueue = new LinkedList<>();
        int[] flag = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};


        while (num != 0) {
            int temp = num % 10;
            if (flag[temp] == 0) {
                intQueue.add(temp);
                flag[temp] = 1;
            }
            num /= 10;
        }
        while (!intQueue.isEmpty()) {
            num = num * 10 + intQueue.remove();
        }
        System.out.println(num);
    }
}