Solution: Validate Binary Search Tree
Understand how to validate a binary search tree by performing an inorder depth-first search that checks node values in ascending order. Learn to implement this algorithm in Go, grasp its time and space complexities, and use it to confirm if a binary tree qualifies as a valid BST.
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Statement
Given the root of a binary tree, check whether it is a valid binary search tree (BST).
A binary tree is a valid BST if for every node:
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The left subtree of a node contains only nodes with keys less than the node’s key.
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The right subtree of a node contains only nodes with keys greater than the node’s key.
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Both the left and right subtrees are valid BSTs.
Constraints:
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