For the storing files on tape problem (without frequencies), why does sorting by smallest file size produce the best lookup cost in expectation? Because, for any two files with equal file size, it does not matter what order they are in Because, sorting them is greedy and greedy algorithms usually work Because, for any two files with the larger file preceding the smaller, swapping the files reduces the cost in expectation Because, for any three files that are out-of-order a random permutation of those files reduces the cost in expectation

For the storing files on tape problem (without frequencies), why does sorting by smallest file size produce the best lookup cost in expectation? Because, for any two files with equal file size, it does not matter what order they are in Because, sorting them is greedy and greedy algorithms usually work Because, for any two files with the larger file preceding the smaller, swapping the files reduces the cost in expectation Because, for any three files that are out-of-order a random permutation of those files reduces the cost in expectation

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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