Answered: index priority queue implementation Add…

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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index priority queue implementation Add an array keys[] to hold key values, an array qp[] to hold the inverse of pq[], and change pq[] to hold indices. Qp[i] returns the position of I in pq[] (the index j such that pq[j] is i). After that, alter the code to maintain these data structures. Include a method that checks for this circumstance and follow the convention that qp[i] = -1 if I am not in the queue. The helper methods exch() and less() must be modified, but not sink() or swim() ().

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