题解 | #明明的随机数#

import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Set<Integer> numberSet = new TreeSet<>(new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return o1.compareTo(o2);
            }
        });
        int n = in.nextInt();
        while(in.hasNextInt()) {
            numberSet.add(in.nextInt());
        }
        numberSet.forEach(System.out::println);
    }
}