OA: Fix a Feature-Rollout Codebase (Country, OS Version, Feature Dependencies)

OAGoogleLast reported May 2026Low Frequency

Reported: 3× across candidate reports
First seen: April 2026
Last reported: May 2026
Reported outcome: pass

Problem Overview

Google online assessment question, reconstructed from 3 candidate reports (April 2026 to May 2026). The write-up includes a Python solution that passes 15 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.

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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.