题解 | #提取不重复的整数#

import java.util.Iterator;
import java.util.Scanner;
import java.util.TreeSet;

// 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 in = new Scanner(System.in);
        String s = new StringBuilder(in.nextLine()).reverse().toString();
        char[] a = s.toCharArray();
        char[] b = new char[s.length()];
        b[0] = a[0];
        char c;
        int z = 1;
        int zhis = 0;
        for (int i = 1; i < s.length(); i++) {
            c = a[i];
            for (int j = 0; j < z; j++) {
                if (c == b[j]) {
                    zhis = 1;
                    break;
                }
            }
            if (zhis == 0) {
                b[z] = c;
                z++;
            }
            zhis = 0;
        }

           String str = String.valueOf(b);
        Integer i = Integer.parseInt(str.trim());
        System.out.println(i);
    }
}