java简单解法，set去重，Arrays.sort排序

import java.util.*;

public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextInt()){
            HashSet<Integer> set = new HashSet<>();
            int num = sc.nextInt();
            for(int i = 0;i < num ; i ++){
                set.add(sc.nextInt());
            }
            Object[] array = set.toArray();
            Arrays.sort(array);
            for(Object a : array){
                System.out.println((Integer)a);
            }
        }
    }
}