题解 | #明明的随机数#

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


public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        TreeSet<Integer> set = new TreeSet<>();
        for(int i = 0; i<n; i++) { 
            set.add(in.nextInt());
        }
        for(int num : set){
            System.out.println(num);
        }
    }
}