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Data Structures & Algorithms In Go

Solution Review: Is It a BST Array?

Understand how to determine whether a given array corresponds to the preorder traversal of a binary search tree. Explore the use of a stack to track node values and validate tree properties efficiently with O(n) time complexity.

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Solution

In pre-order traversal, we first visit the root, then the left child, and finally the right child. So, once we find a value greater than the root value, we are in the right subtree. Therefore, all the nodes that we’ll traverse now will have values greater than the root value. We’ll use this ...