You are given an array A of n> 1 integers (not necessarily sorted) and your goal is to iven an efficient divide and conquer algorithm for the following problem. Note that our divide and conquer algorithm should not use sorting as a subroutine (soe questions melow). (a) To find if there are two integers in A whose product is exactly t. If so, return True, otherwise return False.

Database System Concepts
7th Edition
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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You are given an array A of n>1 integers (not necessarily sorted) and your goal is to
given an efficient divide and conquer algorithm for the following problem. Note that
your divide and conquer algorithm should not use sorting as a subroutine (see questions
below).
(a) To find if there are two integers in A whose product is exactly t. If so, return True,
otherwise return False.
Transcribed Image Text:You are given an array A of n>1 integers (not necessarily sorted) and your goal is to given an efficient divide and conquer algorithm for the following problem. Note that your divide and conquer algorithm should not use sorting as a subroutine (see questions below). (a) To find if there are two integers in A whose product is exactly t. If so, return True, otherwise return False.
For your assigned problem, answer the following:
(i) Explain your algorithm clearly in plain language (pseudocode is not required).
(ii) Argue its correctness.
(iii) Analyze the running time of your algorithm.
(iv) Explain how you can solve your problem in O(n log n) time using MergeSort as a
subroutine (or as a black box) algorithm.
(v) One disadvantage of using MergeSort as a subroutine is that it takes e(n log n) time
in the best case (i.e., for every input). On the other hand, your divide and conquer
algorithm can take O(n) time in the best case. Explain why and give an example
input where your algorithm exhibits 0(n) runtime.
Transcribed Image Text:For your assigned problem, answer the following: (i) Explain your algorithm clearly in plain language (pseudocode is not required). (ii) Argue its correctness. (iii) Analyze the running time of your algorithm. (iv) Explain how you can solve your problem in O(n log n) time using MergeSort as a subroutine (or as a black box) algorithm. (v) One disadvantage of using MergeSort as a subroutine is that it takes e(n log n) time in the best case (i.e., for every input). On the other hand, your divide and conquer algorithm can take O(n) time in the best case. Explain why and give an example input where your algorithm exhibits 0(n) runtime.
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