Explain hash maps and solve array intersection

Q: Explain hash maps and solve array intersection

This is a Coding & Algorithms interview question from Citadel for Software Engineer roles. View the full question and solution on PracHub.

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Question

Explain the internal implementation of a hash map: underlying array/bucket layout, hash function choice, collision resolution strategies (separate chaining vs. open addressing), load factor thresholds and resizing/rehashing, deletion semantics, expected vs. worst-case time complexities, and typical memory trade-offs.
Given k integer arrays, return the sorted list of integers that appear in every array. Then extend your solution to return the integers that appear in at least t of the k arrays (1 ≤ t ≤ k). Provide algorithms, analyze time and space complexity, and discuss edge cases (e.g., duplicates within an array, empty arrays).

Explain hash maps and solve array intersection

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