C - How Many Tables - HDU-1213

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并查集---体会以及模板&&How Many Tables - HDU 1213

定义&&概念: 啥是并查集,就是将所有有相关性的元素放在一个集合里面,整体形成一个树型结构,它支持合并操作,但却不支持删除操作实现步骤:(1)初始化,将所有节点的父亲节点都设置为自己,例如pre[1]=1(2)合并,将一个元素或者一集合(两者间有联系)合并到另外一个集合(元素)里面,谁是谁的父亲节点不需要过多在意,视题意而定.(3)查找,在合并时需要运用到查找操作,即查找该元素的父节点,尽量使用路径压缩,可以使并查集更加高效,一旦使用了路径压缩,查询时就会将该查询元素到父亲的边改为直接连…

（并查集）How Many Tables -- HDU --1213

链接: http://acm.hdu.edu.cn/showproblem.php?pid=1213 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=82830#problem/C 代码: #include<stdio.h> #include<queue> #include<stack> #include<string.h> using namespace std; #define maxn 100…

How Many Tables HDU - 1213

#include<iostream> using namespace std; ; int p[N]; int find(int x) { if(p[x]!=x) p[x]=find(p[x]); return p[x]; } int main() { int t; int n,m; cin>>t; while(t--) { cin>>n>>m; ;i<=n;i++) p[i]=i; while(m--) { int a,b; cin>>a…

【并查集】模板 + 【HDU 1213、HDU 1232、POJ 2236、POJ 1703】例题详解

不想看模板,想直接看题目的请戳下面目录: 目录: HDU 1213 How Many Tables[传送门] HDU 1232 畅通工程 [传送门] POJ 2236 Wireless Network [传送门] POJ 1703 Find them, Catch them [传送门] 先上模板: #define MAXN 根据编号需要 int per[MAXN],rank[MAXN]; void init(int n) { int i; ;i<=n;i++) { per[i]=i;rank[i…

HDU 1213 How Many Tables（模板——并查集）

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1213 Problem Description Today 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 fri…

HDU 1213 - How Many Tables - [并查集模板题]

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1213 Today 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 friends know each other,…