Python solution with detailed explanation


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    G

    Solution

    Contains Duplicate https://leetcode.com/problems/contains-duplicate/

    • Use a set and complete the problem in a single pass
    • Or use a Counter class to test if there are duplicates.
    from collections import Counter        
    class Solution(object):
        def containsDuplicate(self, nums):
            """
            :type nums: List[int]
            :rtype: bool
            """
            return len(Counter(nums)) < len(nums)
    

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