题解 | #明明的随机数#

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

// 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);
        // 注意 hasNext 和 hasNextLine 的区别
        int count = in.nextInt();
        ArrayList<Integer> list = new ArrayList<>();
        boolean[] symbol = new boolean[501];
        while(count>0){
            count--;
            int temp = in.nextInt();
            if(temp<=500 && temp>=1 && symbol[temp]==false){
                symbol[temp] = true;
                list.add(temp);
            }
        }
        Integer[] newList = new Integer[list.size()];
        list.toArray(newList);
        Arrays.sort(newList);
        for(int i:newList){
            System.out.println(i);
        }
    }
}