Path Deletion and Filtering with Trie

Phone ScreenSnowflakeLast reported July 2025Low Frequency

Reported: 1× across candidate reports
First seen: July 2025
Last reported: July 2025
Reported outcome: fail

Problem Overview

Snowflake phone-screen question, reconstructed from 1 candidate report (July 2025). Tests: tries and prefix search; file systems and path trees. The write-up includes a Python solution that passes 7 test cases.

The full 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. Follow-ups candidates reported, not invented ones.

Codex Fact-Checked

Technical claims, formulas, and scale numbers are reviewed against primary sources.

Interviewer Follow-ups

The follow-ups candidates reported, with the trigger that prompts each one — plus the mistakes that sink people.