这道题考察对最小点覆盖的理解. 做法: 对于一个作业,它需要A的a模式和B的b模式,那么可以从a模式向b模式连一条边:可以感性的理解为每一条边就是一个作业,需要求得有多少个模式可以覆盖所有的边,也就是最小点覆盖,也就是最大匹配. 注意 : 由于A,B的机器初始模式为0,那么所有的可以用模式0完成的工作都可以不用更换模式而完成!所以我们只需要考虑完成模式不包含0的作业. AC代码: #include <vector> #include <cstdio> #include <cs…

题目大意:有两个机器,A机器有n种工作模式,B机器有m种工作模式,刚開始两个机器都是0模式.假设要切换模式的话,机器就必须的重新启动 有k个任务,每一个任务都能够交给A机器的i模式或者B机器的j模式完毕,问要重新启动多少次机器才干完毕任务 解题思路:两个机器的点分为两个点集.点集之间的关系就是任务了.要将全部任务都完毕.就要将全部边都覆盖掉,所以就是求最小点覆盖了. 这里有一个点要注意.假设全部任务中都有一个0,那么机器就不用重新启动了,重新启动次数就为0了(由于刚開始都是0) #include…

Machine Schedule Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 13731   Accepted: 5873 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…

题目大意:机器调度问题,同一个任务可以在A,B两台不同的机器上以不同的模式完成.机器的初始模式是mode_0,但从任何模式改变成另一个模式需要重启机器.求完成所有工作所需最少重启次数. =================================================== 对于任务(i,x,y),我们在A机mode_x与B机mode_y之间连一条边.这样,题目就变成了一个二分图,我们的目的是完成所有任务,即覆盖所有线段,题目要求选择最少的点,使得每个线段至少有一个端点被选中(这个…

Machine Schedule Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 14479   Accepted: 6172 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…

题意 机器调度问题 有两个机器A,B A有n种工作模式0...n-1 B有m种工作模式0...m-1 然后又k个任务要做 每一个任务能够用A机器的模式i或b机器的模式j来完毕 机器開始都处于模式0 每次换模式时都要重新启动 问完毕全部任务机器至少重新启动多少次 最基础的二分图最大匹配问题 对于每一个任务把i和j之间连一条边就能够构成一个二分图 那么每一个任务都能够相应一条边 那么如今就是要找最少的点 使这些点能覆盖全部的边 即点覆盖数 又由于二分图的点覆盖数 = 匹配数 那么就是裸的求二分图最大…

Machine Schedule 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 o…

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…

Time Limit: 1000 MS Memory Limit: 10000 KB 64-bit integer IO format: %I64d , %I64u   Java class name: Main [Submit] [Status] [Discuss] Description As we all know, machine scheduling is a very classical problem in computer science and has been studied…

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 schedule desire…