题解 | #明明的随机数#

import java.util.Scanner;
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);
        int n = in.nextInt();
        int[] arr = new int[501];
        for (int i = 0; i < n; i++) {
            int num = in.nextInt();
            if(arr[num] == 0){
                arr[num] = 1;
            }
        }
        for (int i = 0; i < arr.length; i++) {
            if(arr[i] == 1){
                System.out.println(i);
            }
        }
    }
}