_217. Contains Duplicate.md

217. Contains Duplicate

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First completed : June 12, 2024

Last updated : July 01, 2024

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Related Topics : Array, Hash Table, Sorting

Acceptance Rate : 62.33 %

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Solutions

• e217 v1 oneliner.py
• e217 v2.py

Python

e217 v1 oneliner.py

class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        return not len(set(nums)) == len(nums)

e217 v2.py

class Solution:
    def containsDuplicate(self, nums: List[int]) -> bool:
        prev = set()
        for num in nums :
            if num in prev :
                return True
            prev.add(num)

        return False