Design Phone Directory: coding question

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Design a data structure that manages a fixed pool of phone numbers (0..maxNumbers-1) supporting get (assign and return an available number), check (report if a number is available), and release (make a previously assigned number available again). The challenge is to support these operations efficiently (ideally O(1)) and correctly handle reuse of released numbers.

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Apple
Leetcode 379. Design Phone Directory
Reported Feb 14, 2025 · 2 source reports
SENIOR
Source snapshot: Nov 12, 2026
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Design Phone Directory

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Design Phone Directory

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