Copy List with Random Pointer (LC 138)

CodingSnowflakeLast reported August 2026Low Frequency
Reported
2× across candidate reports
First seen
May 2025
Last reported
August 2026
Reported outcome
pass

Problem Overview

Snowflake coding question, reconstructed from 2 candidate reports (May 2025 to August 2026). Tests: linked lists. Candidates reported 1 follow-up. The write-up includes a Python solution that passes 5 test cases.

  • 1 candidate-reported follow-up — the probes candidates report being asked, with the trigger for each
  • 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.
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