HDU 3861 The King's Problem 题目链接 题意:给定一个有向图,求最少划分成几个部分满足以下条件 互相可达的点必须分到一个集合 一个对点(u, v)必须至少有u可达v或者v可达u 一个点仅仅能分到一个集合 思路:先强连通缩点,然后二分图匹配求最小路径覆盖 代码: #include <cstdio> #include <cstring> #include <vector> #include <algorithm> #include &l…

The King’s Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2947    Accepted Submission(s): 1049 Problem Description In the Kingdom of Silence, the king has a new problem. There are N cit…

The King’s Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description In the Kingdom of Silence, the king has a new problem. There are N cities in the kingdom and there are M directional roads betw…

The King’s Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4080    Accepted Submission(s): 1430 Problem Description In the Kingdom of Silence, the king has a new problem. There are N cit…

The King’s Problem Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3244    Accepted Submission(s): 1148 Problem Description In the Kingdom of Silence, the king has a new problem. There are N ci…

http://acm.hdu.edu.cn/showproblem.php?pid=3861 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3254    Accepted Submission(s): 1151 Problem Description In the Kingdom of Silence, the king has a…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3289    Accepted Submission(s): 1165 Problem Description In the Kingdom of Silence, the king has a new problem. There are N cities in the kingdom…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3861 最小路径覆盖的一篇博客:https://blog.csdn.net/qq_39627843/article/details/82012572 题意: 把城市至少分成几个块,规则有三 1. A能B,B能到A,那么A,B一定要在一起. 2. 一个城市只能属于一个块. (说明了是最小不相交覆盖)3. 在一个块里的城市,任意2点之间必须有路径. 对于规则1,就是说强连通的必须在一起,所以用Tarjan…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3861 题目大意: 在csdn王国里面, 国王有一个新的问题. 这里有N个城市M条单行路,为了让他的王国更加高效,国王想要将他的王国划分成几个州,每个城市必须属于一个州.对于两个城市(u,v),如果有一条从u到v的路,也有一条从v到u的路,那么u.v必须属于同一个州.对于每一个州里的任何两个城市u.v,都有不经过其他州的路从u到v或从v到u.现在国王想要知道他的王国最少可以划分成多少个州. 解题思路:…

http://acm.hdu.edu.cn/showproblem.php?pid=3861 题意: 国王要对n个城市进行规划,将这些城市分成若干个城市,强连通的城市必须处于一个州,另外一个州内的任意两个城市u,v,有从u到v的路径或从v到u的路径.求最少可以分成几个州. 思路: 这道题目挺好. 首先,强连通分量进行缩点,重新建图. 新建的图就是一个DAG图,接下来就转换成了最小路径覆盖问题. 最小路径覆盖就是用尽量少的不相交的简单路径覆盖DAG的所有顶点.每个顶点只属于一条路径,单个顶点也可以…