From 0 to 1 Data Structures & Algorithms in Java - Implementation Of The Shortest Path In An Unweighted Graph

The video tutorial explains how to use Breadth First Search (BFS) to create a distance table for finding the shortest path in an unweighted graph. It introduces the distance info data structure, which stores the distance and last vertex for each vertex. The tutorial details the process of building the distance table by initializing it for each vertex and using BFS to explore and update the table. Finally, it describes the shortest path algorithm, which involves backtracking from the destination to the source using a stack to trace the path.

What is the primary purpose of using a distance table in BFS?

• To store the shortest path in an unweighted graph

• To find the longest path in a graph

• To calculate the weight of edges

• To determine the number of vertices in a graph

What is the initial distance set for each vertex in the distance table?

• Eleven

• Minus one

• Infinity

• Zero

What is the first step in setting up the distance table for the shortest path algorithm?

• Exploring all neighbors of the source vertex

• Calculating the shortest path

• Initializing the distance table with an entry for every vertex

• Adding all vertices to the stack

How do you identify an unvisited vertex in the distance table?

• By checking if it is in the stack

• By checking if it has no neighbors

• By checking if its distance is minus one

• By checking if its distance is zero

What is the role of the queue in the BFS process?

• To store the shortest path

• To calculate the distance between vertices

• To keep track of visited vertices

• To explore vertices and their neighbors

What data structure is used to trace back the path from destination to source?

• Queue

• Graph

• Stack

• Tree

What does a minus one in the last vertex entry of the distance table signify?

• The vertex is the destination

• The vertex has been visited

• The vertex is the source

• No valid path exists from the source to that vertex