0001 - Contains Duplicate

Given an integer array nums, return true if any value appears more than once in the array, otherwise return false.

Example 1:

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

Output: true

Example 2:

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

Output: false

In [12]:

def hasDuplicate(nums):
    myset=set()
    for num in nums:
        if num not in myset:
            myset.add(num)
        else:
            return True
    return False

In [13]:

print(hasDuplicate([1, 2, 3, 4]))

False

In [14]:

print(hasDuplicate([1, 2, 3, 3]))

True

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