find a solution for the cost of the Max Array problem         - Explains context and setting of problem, and why you would want to look at the recursive solution. Shows O(nlogn) cost of sorting to find solution and O(n-1) cost to do pairwise comparison         - Gives Illustrative example to explain strategy or gives psuedocode ( do not write in Python)         - Cost is O(n) and correctly evaluated         - Assumes size of data is 2^k for math simplicity         - Shows how there is 1 piece of size 2^k at top level, 2 pieces of size 2^(k-1), 4 pieces of size 2^(k-2), ..., 2^i pieces of size 2^(k-i), 2^k pieces of size 2^(k-k) OR n pieces of size 1         - Sum from 0 to k-1 of 2^i = (2^k -1)/(2-1) = 2^k - 1 (uses A.5 from Cormen)         - Since n=2^k so 2^k - 1 is n-1 ==> Theta(n) or O(n)

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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find a solution for the cost of the Max Array problem

        - Explains context and setting of problem, and why you would want to look at the recursive solution. Shows O(nlogn) cost of sorting to find solution and O(n-1) cost to do pairwise comparison

        - Gives Illustrative example to explain strategy or gives psuedocode ( do not write in Python)

        - Cost is O(n) and correctly evaluated

        - Assumes size of data is 2^k for math simplicity

        - Shows how there is 1 piece of size 2^k at top level, 2 pieces of size 2^(k-1), 4 pieces of size 2^(k-2), ..., 2^i pieces of size 2^(k-i), 2^k pieces of size 2^(k-k) OR n pieces of size 1

        - Sum from 0 to k-1 of 2^i = (2^k -1)/(2-1) = 2^k - 1 (uses A.5 from Cormen)

        - Since n=2^k so 2^k - 1 is n-1 ==> Theta(n) or O(n)

1) Sort array-bach at location N.=> Cost of sorting => 0 (algen)
Max Array Problem
2)
Pairburse
Comparisons.
((x)
(()
0(1)
537 498 Duide
6
5 3 7
5 3 7
3 7|
▶496
4 96
CO
9 6
| ((.)
+
Conquer
Jo(1)
ANS: 9
Jori)
26
Transcribed Image Text:1) Sort array-bach at location N.=> Cost of sorting => 0 (algen) Max Array Problem 2) Pairburse Comparisons. ((x) (() 0(1) 537 498 Duide 6 5 3 7 5 3 7 3 7| ▶496 4 96 CO 9 6 | ((.) + Conquer Jo(1) ANS: 9 Jori) 26
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