题解 | #明明的随机数#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        //先创建容器
        HashSet set =  new HashSet();
        int length = in.nextInt();
        for(int i = 0;i<length;i++){
            set.add(in.nextInt());
        }
        Integer [] result = new Integer[set.size()];
        Object [] obj = set.toArray();
        for(int i = 0;i<set.size();i++){
            result[i] = (Integer)obj[i];
        }
        Arrays.sort(result);
        for(int i = 0;i<result.length;i++){
           System.out.println(result[i]);
        }
    }
}