题解 | #明明的随机数#

import java.util.Scanner;
//删去重复的数字并排序,时间复杂度O(n)
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        //空间换时间，使用数组免排序和复杂结构
        boolean[] arr = new boolean[500];
        int n = in.nextInt();
        for (int i = 0; i < n; i++) {
            int num = in.nextInt();
            arr[num - 1] = true;
        }
        for (int i = 0; i < 500; i++) {
            if (arr[i]) {
                System.out.println(i + 1);
            }
        }
    }
}