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Hash Table Practice

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Comprehension Questions

Question Answer
Why is a good Hash Function Important? To minimize collisions
How can you judge if a hash function is good or not? It is consistent, random, doesn't collide much, and runs in constant time
Is there a perfect hash function? If so what is it? There isn't a perfect one
Describe a strategy to handle collisions in a hash table You can do chaining, where each bucket is a linked list or array. You can also do probing, where an equation takes you from one bucket to the next
Describe a situation where a hash table wouldn't be as useful as a binary search tree If we frequently need to search
What is one thing that is more clear to you on hash tables now How they work internally

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@CheezItMan CheezItMan left a comment

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Nice work Beatrice, this is well done.

Comment on lines +4 to 9
# Time Complexity: O(n) where n is number of strings
# O(n) to build strings_map, O(n) to build reverse_map, O(n) to build answer_array
# Space Complexity: O(n) where n is number of strings
# While there is a large amount of data structures, they scale linearly

def grouped_anagrams(strings)

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👍

Comment on lines +44 to 47
# Time Complexity: O(n log n) - O(n) to build map, O(n) to reverse,
# O(n log n) to sort, O(n) to find answer where n is amount of numbers
# Space Complexity: O(n) - Similarly to last time, there's a decent overhead but it scales linearly
def top_k_frequent_elements(list, k)

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👍 Nice work, correct on time/space complexity as well.

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2 participants