Queue Concepts and Operations

What is a queue in data structures?

• A queue is a data structure that allows random access to elements.

• A queue is a non-linear data structure.

• A queue in data structures is a linear data structure that follows the First In First Out (FIFO) principle.

• A queue is a data structure that follows the Last In First Out (LIFO) principle.

What are the two primary operations that can be performed on a queue?

• enqueue and dequeue

• add and remove

• insert and remove

• push and pop

Explain the process of enqueue in a queue.

• To enqueue in a queue, decrement the rear pointer and insert the new element at that position.

• To enqueue in a queue, insert the new element at the front of the queue.

• To enqueue in a queue, remove the front element and insert the new element at that position.

• To enqueue in a queue, increment the rear pointer and insert the new element at that position.

How is dequeue different from enqueue in a queue?

• Dequeue removes an element from the front of the queue, while enqueue adds an element to the back of the queue.

• Dequeue and enqueue perform the same operation

• Enqueue removes an element from the back of the queue

• Dequeue adds an element to the front of the queue

What is the advantage of using a circular queue over a regular queue?

• Allows for faster insertion and deletion operations

• Requires less memory usage

• Prevents data from being lost during resizing

• Efficiently reuses empty spaces and prevents wastage of memory.

What is a priority queue and how is it different from a regular queue?

• A priority queue stores elements based on priority, while a regular queue follows the FIFO (First In First Out) order.

• A priority queue allows duplicate elements, while a regular queue does not.

• A priority queue stores elements based on insertion order, while a regular queue follows the LIFO order.

• A priority queue follows the LIFO (Last In First Out) order, while a regular queue follows the FIFO order.

Give an example of an application where a queue data structure is used.

• Keyboard input

• Graph traversal

• Binary search

• Print spooling

What is a double-ended queue (deque) and what are its advantages?

• A deque is a type of tree structure with limited functionality

• A deque is a linear data structure with logarithmic time complexity

• A deque only allows insertion at the front and deletion at the back

• A deque is a data structure that allows insertion and deletion of elements from both the front and the back, providing constant time operations at both ends.

How is a deque different from a regular queue?

• A deque has a fixed size, while a regular queue can dynamically resize.

• A deque allows insertion and deletion at both ends, while a regular queue only allows insertion at one end and deletion at the other end.

• A deque is a first-in-first-out data structure, while a regular queue is a last-in-first-out data structure.

• A deque only allows insertion at one end and deletion at the other end, while a regular queue allows insertion and deletion at both ends.

Explain the concept of front and rear in a queue.

• Front is where elements are removed, and rear is where elements are added in a queue.

• Front is where elements are accessed, and rear is where elements are removed in a queue.

• Front is where elements are added, and rear is where elements are accessed in a queue.

• Front is where elements are added, and rear is where elements are removed in a queue.