# What is double ended queue with example?

## What is double ended queue with example?

Deque is a double-ended queue that allows us to add/remove elements from both the ends i.e. front and rear, of the queue. Deque can be implemented using arrays or linked lists. In Java, we have a Deque interface that is inherited from the queue interface to implement Deque.

## What is double ended queue operation?

Operations. The basic operations on a deque are enqueue and dequeue on either end. Also generally implemented are peek operations, which return the value at that end without dequeuing it.

Why double ended queue is used?

Deque or Double Ended Queue is a generalized version of Queue data structure that allows insert and delete at both ends. Operations on Deque: Mainly the following four basic operations are performed on queue: insertFront(): Adds an item at the front of Deque.

### What is double ended queue in C?

Also, you will find working examples of different operations on a deque in C, C++, Java and Python. Deque or Double Ended Queue is a type of queue in which insertion and removal of elements can either be performed from the front or the rear. Thus, it does not follow FIFO rule (First In First Out).

### What are the advantages of priority queue?

A priority queue is typically implemented using Heap data structure. Applications: Dijkstra’s Shortest Path Algorithm using priority queue: When the graph is stored in the form of adjacency list or matrix, priority queue can be used to extract minimum efficiently when implementing Dijkstra’s algorithm.

What is disadvantage of linear queue?

A queue works like the line you wait in. In a linear queue, the traversal through the queue is possible only once,i.e.,once an element is deleted, we cannot insert another element in its position. This disadvantage of a linear queue is overcome by a circular queue, thus saving memory.

#### Is deque a FIFO?

After the stack, the next simplest data abstraction is the queue. Just as a stack was described as a LIFO (last-in, first-out) container, this means a queue can be described as FIFO (first in, first out). A variation is termed the deque, pronounced “deck”, which stands for double-ended queue.

#### What are the five basic operations on a queue?

Basic Operations of Queue Enqueue: Add an element to the end of the queue. Dequeue: Remove an element from the front of the queue. IsEmpty: Check if the queue is empty. IsFull: Check if the queue is full.

What is the advantage of queue?

The advantages of queues are that the multiple data can be handled, and they are fast and flexibility. &nbps Disadvantages of queues: To include a new element in the queue, the other elements must be deleted.

## What are the types of priority queue?

There are two types of priority queue:

• Ascending order priority queue: In ascending order priority queue, a lower priority number is given as a higher priority in a priority.
• Descending order priority queue: In descending order priority queue, a higher priority number is given as a higher priority in a priority.

## How to create a double ended queue data structure?

Double ended queue is a more generalized form of queue data structure which allows insertion and removal of elements from both the ends, i.e, front and back. Implementation of Double ended Queue Here we will implement a double ended queue using a circular array. It will have the following methods:

Can a deque be considered as a queue?

In deque, the insertion can be performed on one end, and the deletion can be done on another end. The queue follows the FIFO rule in which the element is inserted on one end and deleted from another end. Therefore, we conclude that the deque can also be considered as the queue.

### What are the basic operations of a deque?

Deque or Double Ended Queue is a generalized version of Queue data structure that allows insert and delete at both ends. Operations on Deque: Mainly the following four basic operations are performed on queue: insertFront (): Adds an item at the front of Deque. insertLast (): Adds an item at the rear of Deque.

### Which is a generalized version of the queue?

Deque is a linear data structure in which the insertion and deletion operations are performed from both ends. We can say that deque is a generalized version of the queue. Let’s look at some properties of deque.