2-1 Insertion sort on small arrays in merge sort Although merge sort runs in (n lg n) worst-case time and insertion sort runs in (n²) worst-case time, the constant factors in insertion sort can make it faster in practice for small problem sizes on many machines. Thus, it makes sense to coarsen the leaves of the recursion by using insertion sort within merge sort when Chapter 2 Getting Started subproblems become sufficiently small. Consider a modification to merge sort in which n/k sublists of length k are sorted using insertion sort and then merged using the standard merging mechanism, where k is a value to be determined. a. Show that insertion sort can sort the n/k sublists, each of length k, in ☺(nk) worst-case time. b. Show how to merge the sublists in Ⓒ(n lg(n/k)) worst-case time. c. Given that the modified algorithm runs in ☺(nk + n lg(n/k)) worst-case time, what is the largest value of k as a function of n for which the modified algorithm has the same running time as standard merge sort, in terms of -notation? d. How should we choose k in practice?
2-1 Insertion sort on small arrays in merge sort Although merge sort runs in (n lg n) worst-case time and insertion sort runs in (n²) worst-case time, the constant factors in insertion sort can make it faster in practice for small problem sizes on many machines. Thus, it makes sense to coarsen the leaves of the recursion by using insertion sort within merge sort when Chapter 2 Getting Started subproblems become sufficiently small. Consider a modification to merge sort in which n/k sublists of length k are sorted using insertion sort and then merged using the standard merging mechanism, where k is a value to be determined. a. Show that insertion sort can sort the n/k sublists, each of length k, in ☺(nk) worst-case time. b. Show how to merge the sublists in Ⓒ(n lg(n/k)) worst-case time. c. Given that the modified algorithm runs in ☺(nk + n lg(n/k)) worst-case time, what is the largest value of k as a function of n for which the modified algorithm has the same running time as standard merge sort, in terms of -notation? d. How should we choose k in practice?
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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