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Paper- Saejin #53

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Hash Table Practice

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Comprehension Questions

Question Answer
Why is a good Hash Function Important? bc it's fast! time complexity of O1 for searching/adding/removing
How can you judge if a hash function is good or not? values are consistent, map different keys to different values, execute in constant time, hashing should appear random.
Is there a perfect hash function? If so what is it? No.
Describe a strategy to handle collisions in a hash table One strategy is double hashing where a secondary hash function is used when a collision occurs
Describe a situation where a hash table wouldn't be as useful as a binary search tree if a dataset can't produce unique key values
What is one thing that is more clear to you on hash tables now how to handle collisions

CheezItMan
CheezItMan reviewed Jan 28, 2022
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Well done Saejin, you hit the learning goals here. Well done.

hash_practice/exercises.py
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: On
Space Complexity: On
"""
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👍

hash_practice/exercises.py
Comment on lines 27 to +31
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: Onk
Space Complexity: On
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👍

hash_practice/exercises.py

return result




def valid_sudoku(table):
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👍 Correct!

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