Introduction to BST
Concepts and Basic Operations DSA practice problem on Onlearn.
Difficulty: easy.
Topics: Binary Search Trees (BST): Structure, Properties, and Advantages over Simple Binary Trees, Binary Tree, Binary Search Tree, Traversal, Recursion, Time Complexity, Space Complexity, Binary Search, space complexity, tree properties, binary tree, binary search tree, recursion, search operations, time complexity analysis, tree traversal, Binary Search Tree (BST), Searching, BST Properties.
Valid Binary Search Tree Given the root of a binary tree, determine if it is a valid Binary Search Tree (BST). A valid 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 valid Binary Search Trees. For this problem, assume no duplicate values exist in the tree. Input Specification: The input will be the root node of a binary tree. Each TreeNode has an integer value val and two child pointers, left and right. Output Specification: Return True if the given binary tree is a valid BST, False otherwise.