Number of Islands (LC 200 → 694 → 305)

Phone ScreenCitadelLast reported December 2025Low Frequency

Reported: 1× across candidate reports
First seen: December 2025
Last reported: December 2025
Reported outcome: unknown

Problem Overview

A 45-minute Citadel phone screen for a 2026 summer SWE intern role spent about 30 minutes on one grid problem and its follow-ups. The report names the problems only by their LeetCode numbers, in order: LeetCode 200, then LeetCode 694 as a follow-up, then LeetCode 305, which the candidate only…

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.

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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.