题解 | #明明的随机数#

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

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        
        Set set = new TreeSet();//用treeset去重并且升序排序,需要导包

        for(int i =1; i<=a; i++){
            set.add(in.nextInt());
        }

        Iterator it = set.iterator();//需要导包
	  
        while(it.hasNext()){
            System.out.println(it.next());        
        }
    }
}