Task Hierarchy with Subtasks

CodingStripeLast reported September 2026Low Frequency
Reported
2× across candidate reports
First seen
August 2026
Last reported
September 2026
Reported outcome
unknown

Problem Overview

You are given a list of unordered CSV records describing tasks and subtasks. Each record has the format: <timestamp>,task,<task_id>,<task_name> <timestamp>,subtask,<subtask_id>,<parent_id>,<task_name> Example input: 01/01/2025,task,T1,cook dinner 01/01/2025,subtask,T2,T1,buy groceries The problem is broken into four parts: 1. Parse the input and output just the task IDs and names (ignoring subtasks). 2. Parse subtasks…

  • 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.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
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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