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…

传送门:http://acm.hdu.edu.cn/showproblem.php?pid=2444 题意:首先判断所有的人可不可以分成互不认识的两部分.如果可以分成 ,则求两部分最多相互认识的对数. 思路:二分图最大匹配问题.先BFS判断是否为二分图,再用匈牙利算法算最大匹配量 关于匈牙利算法:https://blog.csdn.net/CillyB/article/details/55511666 代码: #include<iostream> #include<cstdio>…

题目链接:http://acm.split.hdu.edu.cn/showproblem.php?pid=2444 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 other, B and C know each other. But this may not imply t…

[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…

链接: https://vjudge.net/problem/HDU-2444#author=634579757 题意: 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…

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…

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…

这是一个基础的二分图,题意比较好理解,给出n个人,其中有m对互不了解的人,先让我们判断能不能把这n对分成两部分,这就用到的二分图的判断方法了,二分图是没有由奇数条边构成环的图,这里用bfs染色法就可以判断,其次让我们求分在两部分的最大对数,这就是二分图的最大匹配问题,这里数据只有200,所以匈牙利算法求蹭广路径的办法可以解决这个问题,也相对比较容易编写. 另外一开始我链式前向星的数组开小了,G++居然返回超时,后来换了C++才RE,想到数组越界的问题,不得不说这些编译器真傲娇啊- #includ…

#include<iostream> #include<cstdio> #include<cstring> #define maxn 2010 using namespace std; int n,m,num,head[maxn],f[maxn],match[maxn],color[maxn]; struct node { int u,v,pre; }e[maxn*maxn]; void Add(int from,int to) { num++; e[num].u=fr…

http://acm.hdu.edu.cn/showproblem.php?pid=2444 题意:给出边,判断这个是否是一个二分图,并求最大匹配. 思路:先染色法求出是否是一个二分图,然后再匈牙利求出最大匹配.注意输出是"No"而不是"NO"!!! #include <cstdio> #include <cstring> #include <cmath> #include <cstdlib> #include <…

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…

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…

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…

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];…

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) Total Submission(s): 2244 Accepted Submission(s): 1056 Problem Description There are a group of students. Some of them may know each other,…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4915    Accepted Submission(s): 2260 Problem Description There are a group of students. Some of them may know each o…

传送门:The Accomodation of Students 题意:有n个学生,m对相互认识的,问能否分成两队,使得每对中没有相互认识的,如果可以求最大匹配,否则输出No. 分析:判断二分图用染色法,然后直接匈牙利算法求最大匹配. #include <cstdio> #include <cstring> #include <string> #include <cmath> #include <iostream> #include <al…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4250    Accepted Submission(s): 1946 Problem Description There are a group of students. Some of them may know each ot…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4091    Accepted Submission(s): 1876 Problem Description There are a group of students. Some of them may know each ot…

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<…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 6424    Accepted Submission(s): 2880 Problem Description There are a group of students. Some of them may know each o…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 8418    Accepted Submission(s): 3709 Problem Description There are a group of students. Some of them may know each ot…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5225    Accepted Submission(s): 2374 Problem Description There are a group of students. Some of them may know each ot…

The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3565    Accepted Submission(s): 1659 Problem Description There are a group of students. Some of them may know each ot…

染色判读二分图+Hungary匹配 The Accomodation of Students Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1705    Accepted Submission(s): 821 Problem Description There are a group of students. Some of them…

Courses Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 8490    Accepted Submission(s): 4134 Problem Description Consider a group of N students and P courses. Each student visits zero, one or…

Girls and Boys Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9100    Accepted Submission(s): 4185 Problem Description the second year of the university somebody started a study on the romant…