题解 | #提取不重复的整数#

import java.util.Scanner;
import java.util.ArrayList;
// 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 input = new Scanner(System.in);
        int i = input.nextInt();
        String s = String.valueOf(i);
        StringBuilder sb = new StringBuilder(s);
        //反转数组
        sb.reverse();
        ArrayList<Character> list = new ArrayList<>();
        for (int j = 0; j < sb.length(); j++) {
            if (list.contains(sb.charAt(j))){
                continue;
            }else {
                list.add(sb.charAt(j));
            }
        }
        StringBuilder stringBuilder = new StringBuilder();
        for (Character c:list){
            stringBuilder.append(c);
        }
        int i1 = Integer.parseInt(stringBuilder.toString());
        System.out.println(i1);
    }
}