"Dijkstra's single-source shortest path algorithm returns a results grid that contains the lengths of the shortest paths from a given vertex [the source vertex] to the other vertices reachable from it. Develop a pseudocode algorithm that uses the results grid to build and return the actual [shortest] path, as a list of vertices, from the source vertex to a given [target] vertex. (Hint: This algorithm starts with a given vertex [the target vertex] in the grid's first column and gathers ancestor [parent] vertices, until the source vertex is reached.)" For your algorithm, assume that grid is the name of the results grid produced by Dijkstra's single-source shortest path algorithm. Each vertex is identified by its label/name, which is in column 1 of grid. As the first step of your algorithm, find the name of the source vertex. Next, get the name of the target vertex from the user. Pseudocode should avoid details through broad-stroke statements. However, it must give enough information to outline the overall strategy. In addition to showing your algorithm, answer the following questions: - In pseudocode, to find the source vertex, you can simply write: find source vertex Without providing code, explain how this would be accomplished in real code. - Did you run into any challenges? If so, what were they and how did you solve them? - Besides the given grid, did you have to use any other collection? If so, which one and why? If not, why not?

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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"Dijkstra's single-source shortest path algorithm returns a results grid that contains the lengths of the shortest paths from a given vertex [the source vertex] to the other vertices reachable from it. Develop a pseudocode algorithm that uses the results grid to build and return the actual [shortest] path, as a list of vertices, from the source vertex to a given [target] vertex. (Hint: This algorithm starts with a given vertex [the target vertex] in the grid's first column and gathers ancestor [parent] vertices, until the source vertex is reached.)"

*For your algorithm, assume that grid is the name of the results grid produced by Dijkstra's single-source shortest path algorithm.

*Each vertex is identified by its label/name, which is in column 1 of grid.

*As the first step of your algorithm, find the name of the source vertex.

*Next, get the name of the target vertex from the user.

Pseudocode should avoid details through broad-stroke statements. However, it must give enough information to outline the overall strategy.

In addition to showing your algorithm, answer the following questions: - In pseudocode, to find the source vertex, you can simply write: find source vertex Without providing code, explain how this would be accomplished in real code. - Did you run into any challenges? If so, what were they and how did you solve them? - Besides the given grid, did you have to use any other collection? If so, which one and why? If not, why not?

--MUST HAVE A UNIQUE, INDIVIDUAL RESPONSE (please don't copy from another site).--

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