Construct a BST and read spiral order

Q: Construct a BST and read spiral order

This question evaluates proficiency in data structures and algorithm design by testing binary search tree reconstruction from a preorder sequence and matrix spiral (clockwise layer) traversal.

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Question

The coding round reportedly included two algorithmic tasks:

Rebuild a binary search tree from a preorder sequence
- You are given an array of distinct integers representing the preorder traversal of a binary search tree.
- Reconstruct the original tree and return its root.
- Aim for a solution that runs in linear time.
Traverse a matrix in clockwise layers
- You are given an m x n integer matrix.
- Return all elements in the order obtained by repeatedly visiting the current outer boundary clockwise and then shrinking the boundary until every cell has been visited.

Construct a BST and read spiral order

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