[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] Verify Preorder Serialization of a Binary Tree 验证二叉树的先序序列化
One way to serialize a binary tree is to use pre-oder traversal. When we encounter a non-null node, we record the node's value. If it is a null node, we record using a sentinel value such as #. ....
[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....
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