Full Completed Balanced Tree Variant

Phone ScreenSnowflakeLast reported February 2026Low Frequency
Reported
1× across candidate reports
First seen
February 2026
Last reported
February 2026
Reported outcome
unknown

Problem Overview

A variant of LeetCode 545 (Boundary of Binary Tree) where the condition is modified: instead of finding the boundary of a binary tree, determine whether a tree satisfies the 'full completed balanced tree' property (every node is either a full node or a leaf, the tree is…

  • 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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