[LeetCode] Validate Binary Search Tree 验证二叉搜索树
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 keys less than the node's ke...
[LeetCode] Validate IP Address 验证IP地址
In this problem, your job to write a function to check whether a input string is a valid IPv4 address or IPv6 address or neither. IPv4 addresses are canonically represented in dot-decimal notatio...
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