题解 | #提取不重复的整数#

直接按String来不完事吗，反正键盘输入的数字也是按字符来接收处理的

import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String number = sc.nextLine();
        StringBuilder sb = new StringBuilder();
        for (int i = number.length() - 1; i >= 0; i--) {
            if (sb.toString().contains(number.charAt(i) + "")) {
                continue;
            } else {
                sb.append(number.charAt(i));
            }
        }
        System.out.println(sb.toString());
        sc.close();
    }
}