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Outer boundary of an N-ary tree

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UberCodingLast asked Oct 2025

Picture walking around an N-ary tree: from the bottom-left up the left side to the root, then down the right side to the bottom-right. Return the nodes seen on that walk, in order.

Agree on the exact output with the interviewer first; a level-order traversal with a deque solves it.

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