Contains Duplicate

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

Explanation:

The element 1 occurs at the indices 0 and 3.

Example 2:

Input: nums = [1,2,3,4]

Output: false

Explanation:

All elements are distinct.

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]

Output: true

Constraints:

• 1 <= nums.length <= 105
• -109 <= nums[i] <= 109

My Answer

# https://leetcode.com/problems/contains-duplicate/
from typing import List
class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        visited = set()
        for item in nums:
            if item in visited:
                return True
            visited.add(item)
        return False

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