217. Contains Duplicate

Topic: Array & Hashing

I came up with 2 different solutions

Soln 1:

• Compare the length of the array with the length of the set created from the array
• Sets is a data structure that does not contain duplicates elements

return len(nums) != len(set(nums))

Soln 2:

• Declare a set as a variable
• loop through the integers in the array
• if the integer does not exist in the set, add it to the set
• else, it means a duplicate exists

         count = set()

         for n in nums:
             if n in count:
               return True
             count.add(n)

         return False

Notes: I worked on this before and just needed it to re-introduce myself into leetcoding