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What is the primary purpose of the 'visited' set in Dijkstra's algorithm?

Practice Questions

Q1
What is the primary purpose of the 'visited' set in Dijkstra's algorithm?
  1. To store the shortest path
  2. To avoid processing the same vertex multiple times
  3. To keep track of the edges
  4. To maintain the priority queue

Questions & Step-by-Step Solutions

What is the primary purpose of the 'visited' set in Dijkstra's algorithm?
  • Step 1: Understand that Dijkstra's algorithm is used to find the shortest path in a graph.
  • Step 2: Know that a graph consists of vertices (points) and edges (connections between points).
  • Step 3: Realize that during the algorithm, we need to look at each vertex to find the shortest path.
  • Step 4: The 'visited' set keeps track of which vertices have already been looked at.
  • Step 5: By using the 'visited' set, we can avoid looking at the same vertex again.
  • Step 6: This makes the algorithm faster and prevents unnecessary work.
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