Implement the basic operations in the index priority-queue API by modifying as follows: Change pq[] to hold indices, add an array keys[] to hold the key values, and add an array qp[] that is the inverse of pq[] — qp[i] gives the position of i in pq[] (the index j such that pq[j] is i). Then modify the code to maintain these data structures. Use the convention that qp[i] = -1 if i is not on the queue, and include a method contains() that tests this condition. You need to modify the helper methods exch() and less() but not sink() or swim().
Implement the basic operations in the index priority-queue API by modifying as follows: Change pq[] to hold indices, add an array keys[] to hold the key values, and add an array qp[] that is the inverse of pq[] — qp[i] gives the position of i in pq[] (the index j such that pq[j] is i). Then modify the code to maintain these data structures. Use the convention that qp[i] = -1 if i is not on the queue, and include a method contains() that tests this condition. You need to modify the helper methods exch() and less() but not sink() or swim().
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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Implement the basic operations in the
index priority-queue API by modifying as follows: Change
pq[] to hold indices, add an array keys[] to hold the key values, and add an array qp[]
that is the inverse of pq[] — qp[i] gives the position of i in pq[] (the index j such that
pq[j] is i). Then modify the code to maintain these data structures.
Use the convention that qp[i] = -1 if i is not on the queue, and include a method
contains() that tests this condition. You need to modify the helper methods exch()
and less() but not sink() or swim().
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