Implement Trie (Prefix Tree)

Phone ScreenSnowflakeLast reported August 2025Low Frequency
Reported
1× across candidate reports
First seen
August 2025
Last reported
August 2025
Reported outcome
unknown

Problem Overview

Implement a Trie (prefix tree) data structure supporting insert, search, and startsWith operations. In a variant observed in this interview, the Trie was applied to a file-system/folder hierarchy: given a path, navigate through the trie nodes representing each…

  • 2 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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