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In BFS, which node is visited first?

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Question: In BFS, which node is visited first?

Options:

  1. The deepest node
  2. The first node added to the queue
  3. The last node added to the queue
  4. The parent node

Correct Answer: The first node added to the queue

Solution: 

In BFS, the first node added to the queue is visited first, as BFS explores all neighbors at the present depth prior to moving on to nodes at the next depth level.

In BFS, which node is visited first?

Practice Questions

Q1
In BFS, which node is visited first?
  1. The deepest node
  2. The first node added to the queue
  3. The last node added to the queue
  4. The parent node

Questions & Step-by-Step Solutions

In BFS, which node is visited first?
  • Step 1: Start with a graph that has nodes (points) connected by edges (lines).
  • Step 2: Choose a starting node (the first node you want to visit).
  • Step 3: Add the starting node to a queue (a list where you can add and remove nodes).
  • Step 4: Visit the first node in the queue (this is the first node you added).
  • Step 5: Look at all the neighbors (connected nodes) of the visited node.
  • Step 6: Add all unvisited neighbors to the end of the queue.
  • Step 7: Repeat steps 4 to 6 until there are no more nodes in the queue.
  • Breadth-First Search (BFS) – BFS is an algorithm for traversing or searching tree or graph data structures, where it explores all neighbor nodes at the present depth before moving on to nodes at the next depth level.
  • Queue Data Structure – BFS uses a queue to keep track of nodes that need to be explored, ensuring that nodes are visited in the order they were added.
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