文章 2017-12-14 来自:开发者社区

[LeetCode] Verify Preorder Sequence in Binary Search Tree 验证二叉搜索树的先序序列

Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. You may assume each number in the sequence is unique. Follow up: Could you do it using....

文章 2017-12-03 来自:开发者社区

[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...

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