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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 ...