贪心算法作业的解题报告(含证明)和源代码:磁盘文件最优存储问题，当初证明花了一些时间。问题描述：设磁盘上有n个文件，f1,f2,…,fn，，每个文件占磁盘上1个磁道。这n个文件的检索概率分别是p1,p2,…,pn,

且∑pi=1。磁头从当前磁道移到被检信息磁道所需的时间可用这2 个磁道之间的径向距离来度量。如果文件pi存放在第i道上, ，则检索这n 个文件的期望时间是∑pipjd(i,j)



其中d(i,j) 是第i道与第j 道之间的径向距离|i-j|。磁盘文件的最优存储问题要求确定这n个文件在磁盘上的存储位置，使期望检索时间达到最小。试设计一个解此问题的算法，并分析算法的正确性和计算复杂性。-Greedy algorithm for solving the report of operations (including certificate) and the source code: the optimal disk file storage issues, had spent some time to prove. Problem Descr iption: There are n disk-based files, f1, f2, ..., fn,, accounts for each file on a disk track. This n the probability of a document retrieval are p1, p2, ..., pn,

And Σpi = 1. Head from the current track information to be seized can be used track the time required between these two tracks to measure the radial distance. Pi if the file stored in the first track i,, then retrieve documents that the expectations of n is Σpipjd (i, j)



Which d (i, j) is the first i Road with the first j of the radial distance between the Road | ij |. Optimal storage disk file to seek to establish that n files on the disk storage location, so expect to minimize search time. Try to design a solution algorithm for this problem and to analyze the correctness of algorithms and computational complexity.