hdu1150&&POJ1325 Machine Schedule---最小点覆盖

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poj 1325 Machine Schedule 最小点覆盖

题目链接:http://poj.org/problem?id=1325 As we all know, machine scheduling is a very classical problem in computer science and has been studied for a very long history. Scheduling problems differ widely in the nature of the constraints that must be satis…

hdu1150&&POJ1325 Machine Schedule---最小点覆盖

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1150 题目大意: 给你两台机器A和B,A机器有n种模式,B机器有m种模式,初始时都是0,现在给你k个任务,每个任务可以由机器A的x模式完成或者机器B的y模式完成,而每次改变机器的模式都要重启一次,问你最少的重启次数使得完成所有任务! 解题思路: 首先初始化为0,所以有模式0完成的任务可以不考虑,然后我们可以考虑建立二分图,机器A和机器B的模式互相连接,某个任务由A的x和B的y完成那么x与y相连,所…

[poj1325] Machine Schedule (二分图最小点覆盖)

传送门 Description As we all know, machine scheduling is a very classical problem in computer science and has been studied for a very long history. Scheduling problems differ widely in the nature of the constraints that must be satisfied and the type of…

POJ1325 Machine Schedule（二分图最小点覆盖集）

最小点覆盖集就是在一个有向图中选出最少的点集,使其覆盖所有的边. 二分图最小点覆盖集=二分图最大匹配(二分图最大边独立集) 这题A机器的n种模式作为X部的点,B机器的m种模式作为Y部的点: 每个任务就作为边,端点是可以完成它的A和B的某个模式. 这样,问题就变成在这个二分图中取出最少的点覆盖所有的边. 此外,因为开始机器都是在初始在0模式下的,所以所有可以在0模式完成的任务一开始就让它们完成这样就不需要切换模式. #include<cstdio> #include<cstring>…

POJ1325 Machine Schedule 【二分图最小顶点覆盖】

Machine Schedule Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 11958 Accepted: 5094 Description As we all know, machine scheduling is a very classical problem in computer science and has been studied for a very long history. Scheduli…

POJ1325 Machine Schedule

Description As we all know, machine scheduling is a very classical problem in computer science and has been studied for a very long history. Scheduling problems differ widely in the nature of the constraints that must be satisfied and the type of sch…