Problem: Validate Binary Search Tree
Understand how to validate a binary search tree by implementing a recursive algorithm that checks node values against allowable ranges. Learn to enforce BST properties for left and right subtrees, ensuring each node fits within the correct value bounds. This lesson helps you master recursive problem-solving techniques and BST verification strategies essential for efficient Java programming.
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Statement
Given the root of a binary tree, determine whether it is a valid binary search tree (BST).
A valid BST satisfies the following properties:
The left subtree of every node contains only nodes with keys strictly less than that node’s key.
The right subtree of every node contains only nodes with keys strictly greater than that node’s key.
Both the left and right subtrees must themselves be valid binary search trees.
Return true if the given binary tree is a valid BST, and false otherwise.
Constraints:
The number of nodes in the tree is in the range
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