"""
第三大的数
"""
from typing import List


class Solution:
    def thirdMax(self, nums: List[int]) -> int:
        if not nums:
            return None
        if len(nums) < 3:
            return max(nums)
        nums = sorted(set(nums), reverse=True)
        if len(nums) >= 3:
            return nums[2]
        else:
            return max(nums)


if __name__ == '__main__':
    result = Solution().thirdMax([3, 2, 1])
    print(result)