"""
存在重复元素
"""
from typing import List


class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        """
        set集合去重
        :param nums:
        :return:
        """
        new_list = set(nums)
        return len(new_list) != len(nums)


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