What is deque example?

A deque, also known as a double-ended queue, is an ordered collection of items similar to the queue. It has two ends, a front and a rear, and the items remain positioned in the collection. In a sense, this hybrid linear structure provides all the capabilities of stacks and queues in a single data structure.

Where is deque used?

It is typically used as an undo or history feature. A new action is inserted into the deque. The oldest items are at the front. A limit on the size of the deque forces the items at the front to be removed at some point as new items are inserted (aging the oldest items).

Which data structures is used to implement deque?

The deque can be implemented using two data structures, i.e., circular array, and doubly linked list. To implement the deque using circular array, we first should know what is circular array.

What is a deque list its different types?

Types of Deque Input Restricted Deque. In this deque, input is restricted at a single end but allows deletion at both the ends. Output Restricted Deque. In this deque, output is restricted at a single end but allows insertion at both the ends.

What is enqueue in data structure?

enqueue: to place something into a queue; to add an element to the tail of a queue; dequeue to take something out of a queue; to remove the first available element from the head of a queue.

What is circular queue in data structure with example?

Circular Queue is a linear data structure in which the operations are performed based on FIFO (First In First Out) principle and the last position is connected back to the first position to make a circle. enQueue(value) This function is used to insert an element into the circular queue.

What is enQueue in data structure?

What is dequeue in data structure and how it is represented in memory?

A double ended queue also called as deque (pronounced as ‘deck’ or ‘dequeue’) is a list in which the elements can be inserted or deleted at either end in constant time. In the computer’s memory, a deque is implemented using either a circular array or a circular doubly linked list.

What is the difference between enqueue and dequeue in data structure?

Enqueue: Adds an item to the queue. If the queue is full, then it is said to be an Overflow condition. Dequeue: Removes an item from the queue. The items are popped in the same order in which they are pushed.

What happens when dequeue?

dequeue : remove the item at the head. peek : return the item at the head (without removing it) size : return the number of items in the queue. isEmpty : return whether the queue has no items.