题目大意: 有一个人要过生日了,请他的朋友来吃饭,但是他的朋友互相认识的才能坐在一起,朋友的编号从1 ~ n,输入的两个数代表着这两个人互相认识(如果1和2认识,2和3认识,那么1和3也就认识了).问需要多少桌子. 思路: 并查集的基础题目,pre数组存的是父节点的值,root数组代表是否为根节点.最后统计根节点的数量就可以了~~~~~ #include <iostream> #include <cstdio> #include <cstring> #include &…

A Bug's Life Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 13709    Accepted Submission(s): 4449 Problem Description Background Professor Hopper is researching the sexual behavior of a rare…

How Many Tables Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 46694    Accepted Submission(s): 23319 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1213 Description: Today is Ignatius' birthda…

HDU1213How Many Tables 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 friends know each other, and all…

什么也不用说,并查集裸题,直接盲敲即可. #include <iostream> #include <cstring> #include <cstdlib> #include <cstdio> #include <cctype> #include <cmath> #include <algorithm> #include <numeric> using namespace std; ]; int getFath…

-----------刷点水题练习java------------- 题意:给定N点,M边的无向图,问有多少个连通块. 思路:可以搜索;  可以并查集.这里用并查集练习java的数组使用,ans=N,合并一个连通块ans--: 以及函数的调用: 经验1:C++声明数组是int fa[1024]:而java则是int[] fa=new int[1024]; 经验2:不加static是非静态函数,访问需要new出该类的对象来调用,加上static是静态函数 可直接访问或者通过类名访问. import…

http://poj.org/problem?id=2236 由于发生了地震,有关组织组把一圈电脑一个无线网,但是由于余震的破坏,所有的电脑都被损坏,随着电脑一个个被修好,无线网也逐步恢复工作,但是由于硬件的限制,一台电脑和另一台电脑能够相连当他们之间的距离小于d,或者还有一台电脑当中介,分别与两台电脑相连. 在修复的过程中,工作者会有两种操作,修复电脑和询问电脑a和电脑b是否相连.当询问的时候输出答案. 因为输入数据很大,需要快速判断电脑a和电脑b相连,所以自然想到用并查集. 初始时候 全部电…

How Many Tables 题目链接: http://acm.hust.edu.cn/vjudge/contest/123393#problem/C 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…

题目链接:hdu1213 赤裸裸的并查集.....水题一个.... #include<stdio.h> #include<string.h> #include<algorithm> #include<queue> #define MAXN 10 using namespace std; int father[1005]; void build(int n) { for(int i = 0 ; i <= n ; i ++) father[i] = i;…

How Many Tables Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 31632 Accepted Submission(s): 15706 Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner ti…