题解 | #提取不重复的整数#

import java.util.*; //倒序排列且提取不重复的数，思路：关键字：倒序+不重复。set可以提取不重复的数，但是它是无序的。LinkedHashSet可以有序排列

public class Main { public static void main(String[] args) { Scanner scanner=new Scanner(System.in); int sc = scanner.nextInt(); List list=new LinkedList<>(); LinkedHashSet set =new LinkedHashSet(); String s = String.valueOf(sc); char[] chars = s.toCharArray(); for (int i = chars.length-1; i >=0; i--) { set.add(chars[i]); } list.addAll(set); for (int i = 0; i <set.size() ; i++) { System.out.print(list.get(i)); } } }