[LeetCode] 98. Validate Binary Search Tree 驗證二叉搜索樹
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 ...
原文：LeetCode第[98]題(Java)：Validate Binary Search Tree（驗證二叉搜索樹）
題目：驗證二叉搜索樹 難度：Medium 題目內容： 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 contains only nodes with keysless tha ...
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