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In DFS, what is the primary data structure used?

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Question: In DFS, what is the primary data structure used?

Options:

  1. Queue
  2. Stack
  3. Array
  4. Hash Table

Correct Answer: Stack

Solution: 

DFS uses a Stack data structure, either explicitly or through recursion, to keep track of the nodes to be explored.

In DFS, what is the primary data structure used?

Practice Questions

Q1
In DFS, what is the primary data structure used?
  1. Queue
  2. Stack
  3. Array
  4. Hash Table

Questions & Step-by-Step Solutions

In DFS, what is the primary data structure used?
  • Step 1: Understand that DFS stands for Depth-First Search, which is a way to explore nodes in a graph or tree.
  • Step 2: Know that DFS needs to remember which nodes to visit next.
  • Step 3: Learn that a Stack is a data structure that works like a stack of plates, where you can only add or remove the top plate.
  • Step 4: Realize that in DFS, we use a Stack to keep track of the nodes we need to explore.
  • Step 5: Understand that we can use a Stack explicitly (by creating one) or implicitly (by using the call stack in recursion).
  • Step 6: Conclude that the primary data structure for DFS is a Stack.
  • Depth-First Search (DFS) – A graph traversal algorithm that explores as far as possible along each branch before backtracking.
  • Stack Data Structure – A linear data structure that follows the Last In First Out (LIFO) principle, used to keep track of nodes in DFS.
  • Recursion – A programming technique where a function calls itself, often used in DFS to manage the stack implicitly.
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