Problem: Validate Binary Search Tree
Explore how to determine if a binary tree is a valid binary search tree by understanding its ordering properties. Learn to implement a recursive validation method that enforces value ranges for each node, ensuring all nodes meet BST conditions within a structured, efficient approach.
We'll cover the following...
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
. ...