LRU Cache (and Open-Ended In-Memory Cache)

Also reported as LeetCode 146

CodingAmazonLast reported October 2026Medium Frequency
Reported
6× across candidate reports
First seen
April 2026
Last reported
October 2026
Reported outcome
mixed

Problem Overview

The round: six reports, all from 2026. Four candidates (two interns, an SDE I and an SDE II in a phone screen) were asked LRU Cache (LeetCode 146), and one says it was exactly as on LeetCode; one intern's interviewer wanted it built with a doubly linked list, and the…

  • 7 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
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Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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