One way to serialize a binary tree is to use pre order 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 . For e ...
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Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. You may assume each number ...
Given a binary tree, return the preorder traversal of its nodes' values. Example: Follow up: Recursive solution is trivial, could you do ...
Given preorder and inorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree ...
Given a binary tree with N nodes, each node has a different value from {1, ..., N}. A node in this binary tree can be flipped by swapping the left ...
Return any binary tree that matches the given preorder and postorder traversals. Values in the traversals pre and post are distinct positive ...
Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer ...
We run a preorder depth first search on the `root`of a binary tree. At each node in this traversal, we output D dashes (where D is the depth ...
先序线索化在很多书上都有详细解读，这里只是写了一个较为完整的一个程序罢了 ...
