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…
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];…
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…
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…
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: 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 example, A and B know each o…
[题目链接]:pid=2444">click here~~ [题目大意]: 给出N个人和M对关系,表示a和b认识,把N个人分成两组,同组间随意俩人互不认识.若不能分成两组输出No,否则输出两组间俩人互相认识的对数 [解题思路]:   先推断是否能构成二分图,推断二分图用交叉染色法:从某个未染色的点出发把此点染成白色,该点周围的点染成黑色.黑色周围的又染成白色.若走到某个点已经染色,而且它相邻点的颜色与它一样则不是二分图,能够这样理解,染白色既增加X集合,黑色既增加Y集合,若某个点即是X集合…
The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3775    Accepted Submission(s): 1771 Problem Description There are a group of students. Some of them may know each ot…
The Accomodation of StudentsTime Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 8939    Accepted Submission(s): 3925 Problem DescriptionThere are a group of students. Some of them may know each othe…
题目链接 题意:n个学生,m对关系,每一对互相认识的能住一个房间.问否把这些学生分成两组,要求每组的学生都互不认识.求最多须要多少个房间. 能否分成两组?也就是说推断是不是二分图,推断二分图的办法,用染色法 把初始点染成黑色,然后与之相连的染成白色,反复,使路径黑白相间, 假设当前点的颜色和与他相连点的颜色同样时,则说明这个图不是二分图 求最多须要多少个房间?也就是求最大匹配数. #include <iostream> #include <cstdio> #include <…