hdu_2444The Accomodation of Students(二分图的判定和计算) 标签:二分图匹配 题目链接 题意: 问学生是否能分成两部分,每一部分的人都不相认识,如果能分成的话,两两认识的人可以去开房哈.求最大的开房数. 题解: 二分染色,黑白染色来看这个图可以被染成一个二分图,如果可以的话求出二分图匹配的个数即可 注意事项: dfs来染色,在求解的时候注意点的编号是从0还是从1开始的 代码: //二分图最好用链表存图 #include<cstdio> #include<…

题目来源:HDU 2444 The Accomodation of Students 题意:n个人能否够分成2组 每组的人不能相互认识 就是二分图判定 能够分成2组 每组选一个2个人认识能够去一个双人间 最多能够有几组 思路:二分图判定+最大匹配 #include <cstdio> #include <cstring> #include <vector> using namespace std; const int maxn = 550; int vis[maxn];…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 9477    Accepted Submission(s): 4165 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2444 Description: There are a gro…

题目链接:https://vjudge.net/problem/HDU-2444 The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7328    Accepted Submission(s): 3270 Problem Description There are a group o…

There are a group of students. Some of them may know each other, while others don't. For example, A and B know each other, B and C know each other. But this may not imply that A and C know each other. Now you are given all pairs of students who know…

本题就是先推断能否够组成二分图,然后用匈牙利算法求出最大匹配. 究竟怎样学习一种新算法呢? 我也不知道什么方法是最佳的了,由于看书本和大牛们写的匈牙利算法具体分析,看了几乎相同两个小时没看懂,最后自己直接看代码,竟然不到半个小时看懂了.然后就能够直接拿来解题啦. 比方topcoder上有这个算法的非常具体的分析.真没看懂. 代码竟然比分析更清晰了?我也不好下结论. 可是我认为基本的思想还是有作用的. 说说我对这个算法的理解吧: 1 假设二分图分为两个集合 U, V,那么从一个集合U出发 2 U的…

题目链接:http://acm.split.hdu.edu.cn/showproblem.php?pid=2444 Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Problem Description There are a group of students. Some of them may know each other, while others don't. For ex…

有n个关系,他们之间某些人相互认识.这样的人有m对.你需要把人分成2组,使得每组人内部之间是相互不认识的.如果可以,就可以安排他们住宿了.安排住宿时,住在一个房间的两个人应该相互认识.最多的能有多少个房间住宿的两个相互认识. 先是要判断是否为二部图,然后求最大匹配. 学习一下模板~ #include<cstdio> #include<cstring> #include<vector> #include<algorithm> using namespace s…

http://acm.hdu.edu.cn/showproblem.php?pid=2444 The Accomodation of Students Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 2444 Description There are a group of students. Some of them may know…

The Accomodation of Students Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Description There are a group of students. Some of them may know each other, while others don't. For example, A and B know each other, B and C k…