In Depth-First Search (DFS), which data structure is primarily used to keep trac
Practice Questions
Q1
In Depth-First Search (DFS), which data structure is primarily used to keep track of the vertices to be explored?
Queue
Stack
Array
Linked List
Questions & Step-by-Step Solutions
In Depth-First Search (DFS), which data structure is primarily used to keep track of the vertices to be explored?
Step 1: Understand that Depth-First Search (DFS) is a method for exploring graphs or trees.
Step 2: Recognize that during the search, we need to remember which vertices (or nodes) we have visited and which ones we still need to explore.
Step 3: Learn that a stack is a data structure that follows the Last In, First Out (LIFO) principle, meaning the last item added is the first one to be removed.
Step 4: Realize that in DFS, we use a stack to keep track of the vertices we need to explore next.
Step 5: Note that this stack can be implemented explicitly (by creating a stack data structure) or implicitly (by using the call stack through recursion).
Step 6: Conclude that the primary data structure used in DFS to keep track of vertices is a stack.
