题解 | #明明的随机数#

import java.util.Scanner;
import java.util.Arrays;
import java.util.HashSet;
// 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 scanner = new Scanner(System.in);

        int n = scanner.nextInt();
        int[] nums = new int[n];
        for (int i = 0; i < n; i++) {
            nums[i] = scanner.nextInt();
        }

        HashSet<Integer> set = new HashSet<>();
        for (int num : nums) {
            if (!set.contains(num)) {
                set.add(num);
            }
        }
        Object[] array = set.toArray();
        Arrays.sort(array);

        for (Object o : array) {
            System.out.println(o);
        }
    }
}