"""
Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.



Example 1:

Input: nums = [1,2,3,1]
Output: true

Example 2:

Input: nums = [1,2,3,4]
Output: false

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true


Constraints:

1 <= nums.length <= 10^5
-10^9 <= nums[i] <= 10^9
"""
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:

        board = set()
        for i in nums:
            if i in board:
                return True
            else:
                board.add(i)

        return False
