Flatten & Unflatten Nested Structure

CodingxAILast reported February 2026Low Frequency
Reported
1× across candidate reports
First seen
February 2026
Last reported
February 2026
Reported outcome
unknown

Problem Overview

A JSON / hierarchical-data processing problem in two parts. Part 1 (Flatten): given a nested Python structure whose containers may be dict, list, or tuple and whose leaves are integers, extract all integers in traversal order as a flat list — e.g. {'a': [1, 2, 3], 'b': {'c': [{'d': 4}],…

  • 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
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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