摘要：Problem DescriptionThese days, you can do all sorts of things online. For example, you can use various websites to make virtual friends. For some people, growing their social network (their friends, their friends' friends, their friends' friends' friends, and so on), has become an addict 阅读全文

摘要：Problem DescriptionFive hundred years later, the number of dragon balls will increase unexpectedly, so it's too difficult for Monkey King(WuKong) to gather all of the dragon balls together.His country has N cities and there are exactly N dragon balls in the world. At first, for the ith dragon ba 阅读全文

摘要：Problem DescriptionXX星有许多城市，城市之间通过一种奇怪的高速公路SARS(Super Air Roam Structure---超级空中漫游结构）进行交流，每条SARS都对行驶在上面的Flycar限制了固定的Speed，同时XX星人对 Flycar的“舒适度”有特殊要求，即乘坐过程中最高速度与最低速度的差越小乘坐越舒服 ,(理解为SARS的限速要求，flycar必须瞬间提速/降速，痛苦呀 ),但XX星人对时间却没那么多要求。要你找出一条城市间的最舒适的路径。(SARS是双向的）。Input输入包括多个测试实例，每个实例包括：第一行有2个正整数n (1<n<=2 阅读全文

摘要：Problem DescriptionA 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, to which no directed edges point.Every node e 阅读全文

摘要：Problem Description上次Gardon的迷宫城堡小希玩了很久（见Problem B），现在她也想设计一个迷宫让Gardon来走。但是她设计迷宫的思路不一样，首先她认为所有的通道都应该是双向连通的，就是说如果有一个通道连通了房间A和B，那么既可以通过它从房间A走到房间B，也可以通过它从房间B走到房间A，为了提高难度，小希希望任意两个房间有且仅有一条路径可以相通（除非走了回头路）。小希现在把她的设计图给你，让你帮忙判断她的设计图是否符合她的设计思路。比如下面的例子，前两个是符合条件的，但是最后一个却有两种方法从5到达8。Input输入包含多组数据，每组数据是一个以0 0结尾的整数对 阅读全文