题解 | #明明的随机数#

import java.util.Scanner;
import java.util.*;

// 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);
        int n = in.nextInt();
        Set<Integer> linkedHashSet = new LinkedHashSet<>();
        for (int i = 0; i < n; i++) {
            linkedHashSet.add(in.nextInt());
        }
        TreeSet<Object> treeSet = new TreeSet<>();
        treeSet.addAll(linkedHashSet);
        treeSet.stream().forEach(System.out::println);
    }
}