题解 | #明明的随机数# 稀里糊涂的编，稀里糊涂的过

import java.util.Scanner;
import java.util.HashSet;
import java.util.stream.Collectors;
import java.util.List;

// 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);

        Integer hangshu = Integer.parseInt(in.nextLine());

        HashSet<Integer> targertSet = new HashSet<>();
        if (hangshu > 0)  {
            for (int i = 0; i < hangshu; i++ ) {
                targertSet.add(Integer.parseInt(in.nextLine()));
            }
        }

        if (targertSet.size() > 0) {
            List<Integer> resultList = targertSet.stream().sorted().collect(
                                           Collectors.toList());
            resultList.forEach(a -> {
                System.out.println(a);
            });
        }
    }
}