题解 | #计算某字符出现次数#

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            int num = sc.nextInt();
            TreeSet treeSet = new TreeSet();
            for(int i = 1 ; i<=num ; i++){
                treeSet.add(sc.nextInt());
            }
            Iterator iterator = treeSet.iterator();
            while(iterator.hasNext()){
                System.out.println(iterator.next());
            }
        }
        
    }
}