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03-树3 Tree Traversals Again
03-树3 Tree Traversals Again(25 分) An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that w ...
分类:其他好文   时间:2017-12-18 12:34:44    阅读次数:238
LeetCode---binary-tree-inorder-traversal
题目: Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree{1,#,2,3}, return[1,3,2]. 题目的意思是进行树的中序遍历。很明显在 ...
分类:其他好文   时间:2017-12-12 21:41:09    阅读次数:96
python学习--递归实例
#!/usr/bin/env python3 # -*- coding: utf-8 '''循环(loop) 迭代(iterate) 递归(recursion) 遍历(traversal) 斐波那契数列 ''' a, b = 0, 1 for i in range(4): a, b = b, a+b... ...
分类:编程语言   时间:2017-12-12 15:00:42    阅读次数:197
LeetCode 107.Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For ...
分类:其他好文   时间:2017-11-28 21:51:32    阅读次数:116
Leetcode:Construct Binary Tree from Preorder and Inorder Traversal
题目大意:分别按先序和中序遍历同一个n结点二叉树,得到两个结点数组P和I。要求利用这些结点数组还原二叉树。 这道题考验对二叉树的理解。先说明一些基础的知识: 先序遍历表示当访问一个结点时,先访问结点值,再访问结点的左孩子,最后访问结点的右孩子。 中序遍历表示当访问一个结点时,先访问结点的左孩子,再访 ...
分类:其他好文   时间:2017-11-10 00:37:07    阅读次数:198
331. Verify Preorder Serialization of a Binary Tree
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, ...
分类:其他好文   时间:2017-10-25 00:52:06    阅读次数:202
lintcode69- Binary Tree Level Order Traversal- easy
Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). Example Given binary tree {3,9,2 ...
分类:其他好文   时间:2017-10-22 11:11:41    阅读次数:129
107. Binary Tree Level Order Traversal II
Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For ...
分类:其他好文   时间:2017-10-21 18:59:16    阅读次数:109
lintcode378- Convert Binary Search Tree to Doubly Linked Lis- medium
Convert a binary search tree to doubly linked list with in-order traversal. Example Given a binary search tree: 4 / \ 2 5 / \ 1 3 return 1<->2<->3<->4 ...
分类:其他好文   时间:2017-10-18 10:13:56    阅读次数:156
105. Construct Binary Tree from Preorder and Inorder Traversal
Given preorder and inorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree. 给定一个二叉树的先序遍历和 ...
分类:其他好文   时间:2017-10-16 16:41:54    阅读次数:137
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