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In Dijkstra's algorithm, what is the purpose of the 'visited' set?

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Question: In Dijkstra\'s algorithm, what is the purpose of the \'visited\' set?

Options:

  1. To store all vertices
  2. To keep track of the shortest path
  3. To avoid processing the same vertex multiple times
  4. To store the distances from the source

Correct Answer: To avoid processing the same vertex multiple times

Solution: 

The \'visited\' set is used to keep track of the vertices that have already been processed to avoid processing the same vertex multiple times, ensuring efficiency.

In Dijkstra's algorithm, what is the purpose of the 'visited' set?

Practice Questions

Q1
In Dijkstra's algorithm, what is the purpose of the 'visited' set?
  1. To store all vertices
  2. To keep track of the shortest path
  3. To avoid processing the same vertex multiple times
  4. To store the distances from the source

Questions & Step-by-Step Solutions

In Dijkstra's algorithm, what is the purpose of the 'visited' set?
  • Step 1: Understand that Dijkstra's algorithm is used to find the shortest path in a graph.
  • Step 2: Know that a graph is made up of points called vertices and lines connecting them called edges.
  • Step 3: When Dijkstra's algorithm runs, it looks at each vertex to find the shortest path to it.
  • Step 4: The 'visited' set is a list that keeps track of which vertices have already been looked at.
  • Step 5: By using the 'visited' set, the algorithm can avoid looking at the same vertex again.
  • Step 6: This helps the algorithm run faster and more efficiently.
  • Visited Set – The 'visited' set in Dijkstra's algorithm is used to track which vertices have been processed to prevent redundant calculations.
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