Description A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between nodes satisfying the following properties. There is exactly one node, called the root, t…

链接http://acm.tju.edu.cn/toj/showp4117.html 4117.   Happy tree friends Time Limit: 1.0 Seconds   Memory Limit: 65536K Total Runs: 164   Accepted Runs: 60 yuebai has an undirected complete graph with n vertices. He wants to know the minimum spanning tr…

Description As we all know caterpillars love to eat leaves. Usually, a caterpillar sits on leaf, eats as much of it as it can (or wants), then stretches out to its full length to reach a new leaf with its front end, and finally "hops" to it by c…

Is It A Tree? Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 17520    Accepted Submission(s): 3939 Problem Description A tree is a well-known data structure that is either empty (null, void, n…

二叉树(Binary Tree)是最简单的树形数据结构,然而却十分精妙.其衍生出各种算法,以致于占据了数据结构的半壁江山.STL中大名顶顶的关联容器--集合(set).映射(map)便是使用二叉树实现.由于篇幅有限,此处仅作一般介绍(如果想要完全了解二叉树以及其衍生出的各种算法,恐怕要写8~10篇). 1)二叉树(Binary Tree) 顾名思义,就是一个节点分出两个节点,称其为左右子节点:每个子节点又可以分出两个子节点,这样递归分叉,其形状很像一颗倒着的树.二叉树限制了每个节点最多有两个子节…

树视图可以用于表示数据的层次. 例如:SAP CRM中的组织结构数据可以表示为树视图. 在SAP CRM Web UI的术语当中,没有像表视图(table view)或者表单视图(form view)那种专门的树视图类型.我们可以认为树视图是表视图的一种特例.因此,没有可以用于创建树视图的向导,需要按以下特定的步骤手动改造已存在的视图. 首先,这个看起来挺难的,但是随着实践次数的增多,你会很容易理解它.在本文,我将创建一个如下模样的树视图. 如你所见,它有两级结构.第一级展示LEAD ID,下一…

无限分级 很多时候我们不确定等级关系的层级,这个时候就需要用到无限分级了. 说到无限分级,又要扯到递归调用了.(据说频繁递归是很耗性能的),在此我们需要先设计好表机构,用来存储无限分级的数据.当然,以下都是自己捣鼓的结果,非标准.谁有更好的设计望不吝啬赐教. 说来其实也简单,就是一个ID和父ID的关系. 以此类推,Id需要是唯一的,ParenId需要是Id列里面存在即可.这样我们就实现无限分级了,如果再加一列Sort排序就更完美了. jstree插件 官方地址:https://www.jstre…

在正文开始之前需要介绍一个人:Sean Sexton. 来自明尼苏达双城的软件工程师.最为出色的是他维护了两个博客:2,000Things You Should Know About C# 和 2,000 Things You Should Know About WPF .他以类似微博式的150字简短语言来每天更新一条WPF和C#重要又容易被遗忘的知识.Follow他的博客也有一段日子了,很希望能够分享给大家. 本系列我不仅会翻译他的每一个tip,也会加入自己开发之中的看法和见解.本系列我希望自…

题目链接:Balanced Binary Tree | LeetCode OJ Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more tha…

题目链接:Same Tree | LeetCode OJ Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. Tags: Depth-first Search 分析 很基本的一道深度优…