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Hash Table Practice

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Comprehension Questions

Question Answer
Why is a good Hash Function Important?
How can you judge if a hash function is good or not?
Is there a perfect hash function? If so what is it?
Describe a strategy to handle collisions in a hash table
Describe a situation where a hash table wouldn't be as useful as a binary search tree
What is one thing that is more clear to you on hash tables now

@hlumapas hlumapas changed the title passes required tests Rock - Hannah L. Jan 17, 2022
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@CheezItMan CheezItMan left a comment

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Nice work Hannah, take a look at my feedback on time complexity here. Otherwise this is quite well done.

Comment on lines 2 to 7
def grouped_anagrams(strings):
""" This method will return an array of arrays.
Each subarray will have strings which are anagrams of each other
Time Complexity: ?
Space Complexity: ?
Time Complexity: O(n)
Space Complexity: O(n)
"""

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👍 Your time complexity is correct, if the words are limited in length, like regular english words. If the words could be any length then this is O(n * m log m) because you're sorting each word.

Comment on lines 19 to +23
def top_k_frequent_elements(nums, k):
""" This method will return the k most common elements
In the case of a tie it will select the first occuring element.
Time Complexity: ?
Space Complexity: ?
Time Complexity: O(n)
Space Complexity: O(n)

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Because you find the max word k times the time complexity here is O(nk)

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2 participants