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In a depth-first search, what happens when a node is visited?

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Question: In a depth-first search, what happens when a node is visited?

Options:

  1. It is added to the queue.
  2. It is marked as visited and all its adjacent nodes are explored.
  3. It is removed from the graph.
  4. It is added to the stack.

Correct Answer: It is marked as visited and all its adjacent nodes are explored.

Solution: 

In DFS, when a node is visited, it is marked as visited and all its adjacent nodes are explored.

In a depth-first search, what happens when a node is visited?

Practice Questions

Q1
In a depth-first search, what happens when a node is visited?
  1. It is added to the queue.
  2. It is marked as visited and all its adjacent nodes are explored.
  3. It is removed from the graph.
  4. It is added to the stack.

Questions & Step-by-Step Solutions

In a depth-first search, what happens when a node is visited?
  • Step 1: Start at the initial node.
  • Step 2: Mark the current node as visited to keep track of it.
  • Step 3: Look at all the nodes that are directly connected to the current node (these are called adjacent nodes).
  • Step 4: For each adjacent node that has not been visited yet, go to that node and repeat the process from Step 2.
  • Depth-First Search (DFS) – A graph traversal algorithm that explores as far as possible along each branch before backtracking.
  • Node Visitation – The process of marking a node as visited to prevent re-exploration and to track the traversal path.
  • Adjacent Nodes – Nodes that are directly connected to the current node, which are explored after the current node is visited.
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