Graph Traversal: BFS and DFS for Competitive Exams

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Graph Traversal: BFS and DFS - Case Studies

Q. What is a key difference between BFS and DFS?

A. BFS uses a stack, DFS uses a queue.
B. BFS explores nodes level by level, DFS explores as far as possible along a branch.
C. BFS is faster than DFS.
D. DFS is always more memory efficient than BFS.

Solution

BFS explores nodes level by level, while DFS explores as far as possible along a branch before backtracking.

Correct Answer: B — BFS explores nodes level by level, DFS explores as far as possible along a branch.

Q. Which algorithm would you use to find the shortest path in an unweighted graph?

Solution

Breadth-First Search (BFS) is used to find the shortest path in an unweighted graph.

Correct Answer: C — Breadth-First Search

Q. Which traversal method explores all neighbors of a node before moving to the next level?

Solution

Breadth-First Search (BFS) explores all neighbors of a node before moving deeper into the graph.

Correct Answer: B — Breadth-First Search

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