清溪浅水

Problem DescriptionMr Wang wants some boys to help him with a project. Because the project is rather complex, the more boys come, the better it will be. Of course there are certain requirements.

Problem Description某省调查城镇交通状况，得到现有城镇道路统计表，表中列出了每条道路直接连通的城镇。省政府“畅通工程”的目标是使全省任何两个城镇间都可以实现交通（但不一定有直接的道路相连，只要互相间接通过道路可达即可）。问最少还需要建设多少条道路？  Input测试输入包含若干测试用例。每个测试用例的第1行给出两个正整数，分别是城镇数目N (

1、  概述并查集（Disjoint set或者Union-find set）是一种树型的数据结构，常用于处理一些不相交集合（Disjoint Sets）的合并及查询问题。2、  基本操作并查集是一种非常简单的数据结构，它主要涉及两个基本操作，分别为：A． 合并两个不相交集合B． 判断两个元素是否属于同一个集合（1）       合并两个不相交集合（Union(x,y)）

I hope you know the beautiful Union-Find structure. In this problem, you're to implement something similar, but not identical.The data structure you need to write is also a collection of disjoint se

Problem DescriptionToday is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the frien