Determine if Binary Tree is Perfect

CodingSnowflakeLast reported March 2025Low Frequency

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

Problem Overview

Given a binary tree, determine whether it is a 'perfect' binary tree — meaning every internal node has exactly 2 children and all leaf nodes are at the same level. Follow-up: Given an imperfect binary tree, find the minimum…

1 candidate-reported follow-up — 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.