描述 网络是由很多交换机与网线组成的,网络中的信息可能会在这些网络中不断转发,给定任意两个交换机,我们需要从中找到最快的路径进行转发,我们定义转发过程中所经过的网线条数为两个交换机之间的路径长度.如果交换机之间没有连接,则认为路径长度为无穷大.同时我们定义网络的最长路径就是任意交换机之间最短路径的最大值.给定一个网络的拓扑结构,请求其最长路径. 输入 输入数据有多组,第一行为一个整数n,表示交换机的台数,并且对这些交换机从1~n编号,接下来的n行中,第i行指定了若个与第i个交换机连接的交换机编号…

Description Have you ever thought about comparing the weight of fruits? That’s what you should do in this problem! Given a series of fruit weight comparisons, you should anticipate the result of another comparison. In this problem, all fruits of the…

Linux给人最大的享受就是可以根据个人喜好去定制令自己舒服的系统配置,像终端颜色的设置就是一个典型的例子. 图1 系统默认状态下的终端显示     在没有经过自定义配置的终端下工作久了,难免容易疲劳,因为所有输入输出都是一个颜色,对查找一些命令的执行结果很不方便.除了颜色,默认终端配置下的长长的路径名也是一个让人比较蛋疼的地方.经过网上一番资料查找,才知道,原来对终端的配置,可以写到不同的文件之中,例如:-/.bashrc./etc/bash.bashrc./etc/profile这几个文件.…

http://codeforces.com/gym/100781/attachments 题意:有N个点,M条边,问对两两之间的树添加一条边之后,让整棵大树最远的点对之间的距离最近,问这个最近距离是多少. 思路:一开始看成只有两个连通块,后来才注意到是多个连通块.DFS搜树上最长路径.答案有三种:第一种是添加了边之后,树的最长路径还是原来子树的路径,第二种是对子树长度进行排序后,两个最长的距离分别除以2向上取整后加上1.第三种比较难注意到,就是第二第三长的分别除以2向上取整后加上2,因为可能隔着…

Walking Race   Description flymouse's sister wc is very capable at sports and her favorite event is walking race. Chasing after the championship in an important competition, she comes to a training center to attend a training course. The center has N…

Computer Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4440    Accepted Submission(s): 2236 Problem Description A school bought the first computer some time ago(so this computer's id is 1). Du…

题目描述 一个无环的有向图称为无环图(Directed Acyclic Graph),简称DAG图.     AOE(Activity On Edge)网:顾名思义,用边表示活动的网,当然它也是DAG.与AOV不同,活动都表示在了边上,如下图所示:                                         如上所示,共有11项活动(11条边),9个事件(9个顶点).整个工程只有一个开始点和一个完成点.即只有一个入度为零的点(源点)和只有一个出度为零的点(汇点).    关键…

题目链接: http://poj.org/problem?id=1797 Background Hugo Heavy is happy. After the breakdown of the Cargolifter project he can now expand business. But he needs a clever man who tells him whether there really is a way from the place his customer has buil…

In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors connecting some rooms. Each time, Wind choose two rooms x and y, and ask one of their little sons go from one to the other. The so…

HDU 1069 Monkey and Banana / ZOJ 1093 Monkey and Banana (最长路径) Description A group of researchers are designing an experiment to test the IQ of a monkey. They will hang a banana at the roof of a building, and at the mean time, provide the monkey with…