File System Encryption - Minimize Total Encryption Time

Phone ScreenDatabricksLast reported April 2026Low Frequency

Reported: 1× across candidate reports
First seen: April 2026
Last reported: April 2026
Reported outcome: unknown

Problem Overview

A file system is represented as a tree with two node types: - DirectoryNode: has children (mix of DirectoryNode and FileNode) - FileNode: has an is_encrypted boolean attribute Part 1: Implement a function that, given a root DirectoryNode, recursively traverses the entire subtree and returns (encrypted_count, unencrypted_count). Part 2: Given…

3 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

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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.