How a queue can be implemented using singly linked list?

In a Queue data structure, we maintain two pointers, front and rear. The front points the first item of queue and rear points to last item. enQueue() This operation adds a new node after rear and moves rear to the next node. deQueue() This operation removes the front node and moves front to the next node.

Can we implement queue using linked list?

A queue data structure can be implemented using linked list data structure. The queue which is implemented using linked list can work for unlimited number of values. That means, queue using linked list can work for variable size of data (No need to fix the size at beginning of the implementation).

How can a singly linked list be implemented so that insertion requires no test for whether head is null?

Singly linked list insertion with no test for head is null: For avoiding the test for “head==NULL”, initialize the “head” with a dummy node. Thus the “head” will be never “NULL”.

Can a singly linked list be implemented without using a head node?

Implementations: There are usually two forms of linked list: Without a dummy head (refer to the top singly linked list in the following diagram), or. With a dummy head (bottom one). Dummy headers are often used because they help with the implementation.

Can queue be implemented using doubly linked list?

Deque or Double Ended Queue is a generalized version of Queue data structure that allows insert and delete at both ends.

How many stacks are needed to implement a queue?

two stacks
A queue can be implemented using two stacks. Let queue to be implemented be q and stacks used to implement q be stack1 and stack2.

Can we implement two stacks single array?

To implement two stacks in one array, there can be two methods. First is to divide the array in to two equal parts and then give one half two each stack. But this method wastes space. So a better way is to let the two stacks to push elements by comparing tops of each other, and not up to one half of the array.

What is single linked list data structure?

Singly Linked List: It is the simplest type of linked list in which every node contains some data and a pointer to the next node of the same data type. The node contains a pointer to the next node means that the node stores the address of the next node in the sequence.

How do you create a node in singly linked list?

Algorithm

1. Create a class Node which has two attributes: data and next. Next is a pointer to the next node.
2. Create another class which has two attributes: head and tail.
3. addNode() will add a new node to the list: Create a new node.
4. display() will display the nodes present in the list:

How will you implement priority queue using doubly linked list?

Approach :

1. Create a doubly linked list having fields info(hold the information of the Node), priority(hold the priority of the Node), prev(point to previous Node), next(point to next Node).
2. Insert the element and priority in the Node.
3. Arrange the Nodes in the increasing order of priority.

How do you implement a double ended queue?

For implementing deque, we need to keep track of two indices, front and rear. We enqueue(push) an item at the rear or the front end of qedue and dequeue(pop) an item from both rear and front end. Inserting First element in deque, at either front or rear will lead to the same result.

How can a queue be implemented using two stacks?

A queue can be implemented using two stacks. Let queue to be implemented be q and stacks used to implement q be stack1 and stack2….Queue using Stacks

1. While stack1 is not empty, push everything from stack1 to stack2.
2. Push x to stack1 (assuming size of stacks is unlimited).
3. Push everything back to stack1.

How do you implement a queue in a linked list?

A queue can be easily implemented using a linked list. In singly linked list implementation, enqueuing happens at the tail of the list, and the dequeuing of items happens at the head of the list. We need to maintain a pointer to the last node to keep O(1)efficiency for insertion.

What is enqueuing and dequeuing in a singly linked list?

In singly linked list implementation, enqueuing happens at the tail of the list, and the dequeuing of items happens at the head of the list. We need to maintain a pointer to the last node to keep O (1) efficiency for insertion.

What are the alternatives of array implementation of queue?

One of the alternative of array implementation is linked list implementation of queue. The storage requirement of linked representation of a queue with n elements is o (n) while the time requirement for operations is o (1). In a linked queue, each node of the queue consists of two parts i.e. data part and the link part.

What are front and rear pointers in linked queue?

In the linked queue, there are two pointers maintained in the memory i.e. front pointer and rear pointer. The front pointer contains the address of the starting element of the queue while the rear pointer contains the address of the last element of the queue. Insertion and deletions are performed at rear and front end respectively.