题解 | #提取不重复的整数#

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.close();
        List<Integer> list = new ArrayList<>();
        while (n > 0) {
            int digit = n % 10;
            if (!list.contains(digit)) {
                list.add(digit);
            }
            n /= 10;
        }
        int res = 0;
        for (int digit : list) {
            res = res * 10 + digit;
        }
        System.out.println(res);
    }
}