Boundary of Binary Tree: coding question

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Return the boundary of a binary tree: list nodes on the left boundary top-down (excluding leaves), then all leaves left-to-right, then the right boundary bottom-up (excluding leaves), avoiding duplicates. The challenge is to traverse and partition nodes correctly (including edge cases like single-node or skewed trees) while preserving the required order.

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Amazon
Leetcode 545. Boundary of Binary Tree
Reported Oct 1, 2025 · 2 source reports
MID_LEVEL
Source snapshot: Nov 12, 2026
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Meta
Leetcode 545. Boundary of Binary Tree
Reported Jan 16, 2026 · 8 source reports
JUNIOR, MANAGER, MID_LEVEL, SENIOR
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Snowflake
Leetcode 545. Boundary of Binary Tree
Reported Feb 22, 2026 · 1 source report
JUNIOR
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Snowflake
Boundary of Binary Tree

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Boundary of Binary Tree

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Boundary of Binary Tree

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