[LeetCode] Search in a Binary Search Tree 二叉搜索樹中搜索
Given the root node of a binary search tree (BST) and a value. You need to find the node in the BST that the node's value equals the given value. ...
原文：[LeetCode] Binary Search Tree Iterator 二叉搜索樹迭代器
Implement an iterator over a binary search tree BST . Your iterator will be initialized with the root node of a BST. Callingnext will return the next smallest number in the BST. Note:next andhasNext s ...
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Given 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 ...