Snapshot Set / Iterator Design

CodingDatabricksLast reported July 2026High Frequency
Reported
20× across candidate reports
First seen
January 2025
Last reported
July 2026
Reported outcome
mixed

Problem Overview

Design a SnapshotSet data structure supporting the following operations: - add(x): Add element x to the set. Returns whether it was newly added. - remove(x): Remove element x from the set. Returns whether it was present. - contains(x): Return whether x is currently in the set (reflects real-time state). -…

  • 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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