Which of the following statements is true about DFS?
Practice Questions
Q1
Which of the following statements is true about DFS?
It can be implemented using a queue.
It is not suitable for finding shortest paths.
It always uses less memory than BFS.
It visits nodes in level order.
Questions & Step-by-Step Solutions
Which of the following statements is true about DFS?
Step 1: Understand what DFS (Depth-First Search) is. It is an algorithm used to explore nodes and edges of a graph by going as deep as possible along each branch before backtracking.
Step 2: Recognize that DFS explores one path completely before moving to another path. This means it goes deep into one branch of the graph.
Step 3: Know that in an unweighted graph, the shortest path is the one with the least number of edges. To find the shortest path, you need to explore all possible paths at the current depth before going deeper.
Step 4: Realize that since DFS does not explore all neighbors at the current depth before going deeper, it may miss shorter paths that could be found by exploring other branches first.
Step 5: Conclude that because of this behavior, DFS is not suitable for finding the shortest paths in unweighted graphs.
