C++ Stacks and Queues

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Questions and Answers

If a stack is implemented using an array and the array is full, what happens when you try to `push` another element onto the stack?

The array automatically resizes.
A stack overflow error occurs. (correct)
The program crashes.
The first element is overwritten.

In a queue implemented using a circular array, what is the significance of using the modulo operator (%) in the `enqueue` and `dequeue` operations?

It is used to calculate the average queue length.
It allows the queue to wrap around the array. (correct)
It helps in managing the priority of elements.
It prevents integer overflow.

Which of the following scenarios is best suited for using a stack data structure?

Managing customer service requests in the order they were received.
Finding the shortest path in a graph.
Reversing a word or a string. (correct)
Implementing a playlist where songs are played in the order they were added.

In the context of function call management, what is the primary role of a stack?

To store the return addresses of function calls. (D) Signup and view all the answers

Consider a text editor with an undo/redo feature. Which data structure is most suitable for implementing this functionality, and why?

Stack, because it allows reversing the order of actions. (B) Signup and view all the answers

Which real-world scenario would be best modeled using a queue data structure?

Customers waiting in line at a bank. (D) Signup and view all the answers

In a print queue management system, what is the advantage of using a queue data structure?

It ensures that print jobs are processed in the order they were submitted. (A) Signup and view all the answers

When a web server uses a queue to handle incoming requests, what benefit does it primarily provide?

Ensuring that requests are processed in the order they were received. (C) Signup and view all the answers

Which of the following statements accurately describes the key difference between a stack and a queue?

Stacks manage elements in a last-in, first-out order, while queues use a first-in, first-out order. (B) Signup and view all the answers

Why do stacks typically use a single pointer to the top element, whereas queues typically use two pointers (front and rear)?

Stacks only need to access the most recently added element, while queues need to access both the first and last elements. (C) Signup and view all the answers

Which of the following is a primary reason why implementing a queue with a linked list can be more efficient than using a static array?

Linked lists eliminate the need to shift elements during dequeue operations. (B) Signup and view all the answers

When should a dynamic array be preferred over a linked list for implementing a stack?

When the number of elements is known in advance and memory efficiency is a priority. (A) Signup and view all the answers

In a system that requires processing tasks in the order they are received, but also needs to occasionally revert to previous states, which combination of data structures would be most effective?

A queue for task processing and a stack for state reversion. (C) Signup and view all the answers

Which of the following is true about using stacks for depth-first search (DFS) algorithms?

Stacks allow the algorithm to explore deeper into the graph whenever possible. (A) Signup and view all the answers

How do queues facilitate breadth-first search (BFS) algorithms in graph traversal?

Queues process all neighbors of a node before moving to the next level of the graph. (A) Signup and view all the answers

Consider a scenario where you need to validate if the parentheses in a given expression are balanced. Which data structure is most suitable for this task?

Stack (A) Signup and view all the answers

In a call center system, calls are placed on hold and answered in the order they were received. Which data structure is most appropriate for managing these calls?

Queue (B) Signup and view all the answers

What is the primary advantage of using a queue over a stack in a multi-threaded environment where tasks need to be processed in a fair and orderly manner?

Queues ensure that tasks are processed in the order they were submitted, preventing starvation. (D) Signup and view all the answers

Which of the following best describes the use of queues in operating systems for scheduling processes?

Queues ensure that processes are executed in the order they were created or requested. (D) Signup and view all the answers

How does choosing between a stack and a queue affect the memory usage patterns in algorithms that involve backtracking or state exploration?

Stacks may lead to deeper exploration and potentially higher memory usage in backtracking scenarios, while queues explore breadth-wise, affecting memory differently. (B) Signup and view all the answers

Flashcards

What is a Stack?

A data structure that follows the Last-In-First-Out (LIFO) principle.

What is 'push' in a stack?

Adding an element to the top of the stack.