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AMcGinley C15 Hash #44

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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

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@CheezItMan CheezItMan left a comment

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Well done Alison. You hit the learning goals here. Let me know if you have questions on my feedback.

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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👍 Time/space complexity is correct if the words are of limited length (like English words) and O(n * m log m) where m is the length of the words otherwise.

Comment on lines 20 to 25
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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👍 Due to the loop and nested max call from lines 35-38. This is O(nk) for time complexity.

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