Stacks Data Structure Questions

Vikas Vimal (Vikki)

Score: 🔥 175

Beginner

Took 8 days

DSA

Stacks Data Structure

40%

Questions Attempted

10 / 10

Correct Answers

Incorrect Answers

Points Earned

🔥 4

Question 1

Which data structure is most closely related to the concept of recursion?

Queue
Linked List
Stack
Tree

Explanation:

Recursion uses the call stack to keep track of function calls. Each recursive call is pushed onto the stack, and when a call completes, it's popped off, mimicking the LIFO principle.

Question 2

In the context of memory allocation within a program, what type of stack is used?

Queue
Heap
Call Stack
Linked List

Explanation:

The call stack keeps track of active functions, their local variables, and the order in which functions are called and returned from.

Question 3

In which scenario would an array-based stack be a more suitable choice than a linked list-based stack?

When the maximum size of the stack is unknown.
When dealing with a very large dataset where memory usage is critical.
When the stack size is known in advance and relatively small.
When frequent insertions and deletions are required in the middle of the stack.

Explanation:

If the stack size is predictable and small, an array-based stack can be more efficient due to its contiguous memory allocation and simpler implementation. Linked lists introduce some overhead with their pointer structure.

Question 4

In the context of the 'Next Greater Element' problem, what does the term 'next greater' refer to?

The element that is lexicographically greater.
The element with the next highest value in a sorted order.
The element that is both to the right and has a larger value.
The element that appears most frequently after the current element.

Explanation:

The 'Next Greater Element' problem focuses on finding the element that is positioned to the right of the current element and holds a greater numerical value.

Question 5

In which scenario would you prefer using a stack over a queue data structure?

Managing a print queue where tasks are processed in the order they arrive.
Implementing an undo/redo functionality in a text editor.
Storing a collection of songs to be played in a shuffled order.
Simulating a first-in, first-out (FIFO) system.

Explanation:

Stacks follow a Last-In, First-Out (LIFO) principle, making them well-suited for undo/redo operations. The most recent action is the first one to be undone.

Question 6

In a stack, how is the element that was added before the last added element accessed?

Directly using its index.
By popping the top element first.
It's not possible to access elements directly in a stack.
By searching the entire stack sequentially.

Explanation:

Stacks restrict access to only the top element. To reach elements deeper in the stack, you need to pop elements one by one until you reach the desired element.

Question 7

In a 'Next Greater Element' problem, if no greater element exists to the right of an element, what is typically assigned as its 'next greater element'?

0
-1
The element itself
None of the above

Explanation:

Conventionally, -1 is assigned as the 'next greater element' when no element to the right holds a greater value. This helps differentiate it from potential valid values within the data.

Question 8

How does a stack help in converting infix expressions to postfix?

By reversing the order of operands
By prioritizing operators based on precedence
By eliminating the need for parentheses
By directly translating the expression

Explanation:

Stacks help arrange operators in the output based on their precedence, ensuring the correct order of operations in the postfix expression.

Question 9

What real-world scenario accurately reflects the functioning of a stack?

Cars parked in a single-lane driveway
People standing in a queue at a ticket counter
Books arranged alphabetically on a shelf
Customers waiting on hold for customer service

Explanation:

In a single-lane driveway, the last car parked is the first one that needs to be moved out. This mirrors the LIFO principle of stacks.

Question 10

Which data structure is most similar to a deque in terms of functionality?

Stack
Queue
Heap
Binary Search Tree

Explanation:

Both queues and deques allow insertions and deletions at both ends. However, deques offer more flexibility.