Java 代码

import java.util.Scanner;

public class Main
{
    public static int getUniqueCount(int[] nums, int n)
    {
        int count = 0;
        for (int i = 0; i < nums.length; i ++)
        {
            boolean dup = false;
            for (int j = 0; j < i; j ++)
            {
                if (nums[i] == nums[j])
                {
                    dup = true;
                    break;
                }
            }
            if (!dup)
                count += 1;
        }

        return count;
    }

    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int n = cin.nextInt();
        int[] nums = new int[n];

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

        System.out.println(getUniqueCount(nums, n));
    }
}