Validate Binary Search Tree - Leetcode 98 | The Wrong, the Bad and the Optimal DFS

🧩 *PROBLEM DESCRIPTION*

Given the `root` of a binary tree, _determine if it is a valid binary search tree (BST)_.

Assume a BST is defined as follows:

* The left subtree of a node contains only nodes with keys less than the node's key.
* The right subtree of a node contains only nodes with keys greater than the node's key.
* Both the left and right subtrees must also be binary search trees.

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🔗 *LINKS*

⭐Problem: https://leetcode.com/problems/validate-binary-search-tree/
💻Code: https://k5kc.com/cs/problems/validate-binary-search-tree/

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🌲 Binary Search Tree: https://www.youtube.com/playlist?list=PLB53ggSrd6qms0ZCardUXU8ueO3HLNVxm
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🔍 Depth First Search: https://www.youtube.com/playlist?list=PLB53ggSrd6qmL31lA3caJ14aDU911dvBh
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