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Hash Table Practice

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Comprehension Questions

Question Answer
Why is a good Hash Function Important? constant lookups
How can you judge if a hash function is good or not? when collisions are minimal
Is there a perfect hash function? If so what is it? https://imgur.com/a/oWL727A
Describe a strategy to handle collisions in a hash table Chaining: to store an element in the hash table you must insert it into a specific linked list.
Describe a situation where a hash table wouldn't be as useful as a binary search tree when elements need to be sorted
What is one thing that is more clear to you on hash tables now ⚙️ the inner workings of a hash ⚙️

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@CheezItMan CheezItMan left a comment

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Great work Kim! You hit the learning goals and even got the bonus. Well done. I had a few minor comments, but this is great.

Comment on lines +4 to 6
# Time Complexity: O(n) where n is the number of chars
# Space Complexity: O(n) where n is the number of words
def grouped_anagrams(strings)

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👍 Interesting solution, the time complexity is O(n) if the words are pretty short, if they're unlimited in length the time complexity is O(nm) where m is the length of the longest string.

Comment on lines +24 to 26
# Time Complexity: O(n log n)
# Space Complexity: O(n)
def top_k_frequent_elements(list, k)

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👍 Well done

Comment on lines +57 to 59
# Time Complexity: O(1)
# Space Complexity: O(n)
def valid_sudoku(table)

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👍 I would say the time/space complexities are both O(1) since Sudoku never gets bigger than 9x9.

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2 participants