File System Encryption - Count Encrypted/Unencrypted Files

Phone ScreenDatabricksLast reported August 2026Low Frequency
Reported
2× across candidate reports
First seen
April 2026
Last reported
August 2026
Reported outcome
unknown

Problem Overview

You are given a file system represented as a tree. There are two node types: - DirectoryNode: has a children list that can contain a mix of DirectoryNode and FileNode instances. - FileNode: has an is_encrypted boolean flag. Part 1: Implement a function that accepts a root DirectoryNode and recursively…

  • 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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