Number of Islands and Follow-Ups

CodingAmazonLast reported October 2026Medium Frequency
Reported
5× across candidate reports
First seen
October 2025
Last reported
October 2026
Reported outcome
mixed

Problem Overview

The round: five Amazon reports, October 2025 to October 2026. An intern loop had number of islands and a new-grad onsite had an island problem; an Applied Scientist final had a DFS question "similar to number of islands". Two reports describe the follow-ups. An L5 onsite: count the islands (a…

  • 4 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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