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 num = sc.nextInt();
        List<Integer> list = new ArrayList<>();
        while(num > 10) {
            int n = num % 10;
            if(!list.contains(n)) list.add(n);
            num /= 10;
        }
        if(!list.contains(num)) list.add(num);
        num = num/10;
        
        int finalNum = 0;
        for(int i = 0;i < list.size();i++) {
            finalNum *= 10;
            finalNum += list.get(i);
        }
        System.out.println(finalNum);
        
        sc.close();
    }
}