Stacks and Queues - Case Studies for Competitive Exams

Stacks and Queues - Case Studies

Q. In a stack, what will be the output of popping an element from an empty stack?

Solution

Popping an element from an empty stack typically results in an error, as there are no elements to remove.

Correct Answer: B — Error

Q. What happens when you try to enqueue an element into a full queue?

Solution

When trying to enqueue an element into a full queue, an error is typically raised, indicating that the queue cannot accept more elements.

Correct Answer: C — An error is raised

Q. What is the main advantage of using a deque over a regular queue?

Solution

A deque (double-ended queue) allows for adding and removing elements from both ends, providing more flexibility than a regular queue.

Correct Answer: B — Ability to add/remove from both ends

Q. What is the primary use of a stack in algorithm design?

Solution

Stacks are primarily used to manage function calls in programming, allowing for backtracking and maintaining the order of execution.

Correct Answer: B — To manage function calls

Q. What is the time complexity of accessing an element in a queue?

Solution

Accessing an element in a queue typically requires O(n) time because you may need to traverse the queue to find the element.

Correct Answer: B — O(n)

Q. Which data structure would you use to implement a call stack?

Solution

A call stack is implemented using a stack data structure, which allows for the last function called to be the first one to return (LIFO).

Correct Answer: D — Stack

Q. Which of the following is a characteristic of a circular queue?

Solution

A circular queue uses a fixed size array and allows for efficient memory usage by reusing empty spaces created by dequeued elements.

Correct Answer: D — Both B and C

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