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1.
Introduction
2.
3.
4.
Difference between Singly Linked List and Doubly Linked List
4.1.

4.2.

4.3.

4.4.

4.5.

5.
5.1.
What is the Key Difference between a Singly-Linked List and a Doubly-Linked List?
5.2.
What is the stopping condition of the quick sort algorithm?
5.3.
How does quicksort for linked lists work?
5.4.
What is the advantage of doubly linked list over singly linked list?
5.5.
Conclusion
Last Updated: May 4, 2024

# Difference between a Singly Linked List and a Doubly Linked List

Ishita Chawla
0 upvote

## Introduction

A linked list is an important topic to understand while preparing for technical interviews, and it may be used to answer a variety of problems. To solve and answer complex questions, it is necessary to have a profound understanding of the fundamental principles.

This blog will discuss a fundamental but significant topic, i.e., the differences between a singly linked list and a doubly linked list.

Recommended Topic, Floyds Algorithm and Rabin Karp Algorithm.

## Singly Linked List

A unidirectional linked list containing a set of ‘N’ nodes that can be traversed from the first node to the last node is called a singly linked list. Its node consists of two parts, data and a pointer containing the address of the next node.

For example,

## Doubly Linked List

A linked list containing a set of ‘N’ nodes that can be traversed in both directions, i.e., forward and backward, is termed as a doubly-linked list. Each node of a Doubly Linked List consists of three parts, data, and two pointers, one containing the address of the next node and the other having the address of the previous node.

For example,

## Difference between Singly Linked List and Doubly Linked List

Let us look at a few key differences between a singly linked list and a doubly linked list.

Also read - Merge sort in linked list

## Frequently Asked Questions

### What is the Key Difference between a Singly-Linked List and a Doubly-Linked List?

A Singly-Linked List contains a pointer to only its next node whereas a Doubly-Linked List contains a pointer to both its next as well as previous node.

### What is the stopping condition of the quick sort algorithm?

Like the Quicksort() function, the Partition() function takes an array and its size. In this function, we first check that the array size is larger than 1; this is the stopping condition since an array of size 1 is, by definition, sorted.

### How does quicksort for linked lists work?

Quicksort algorithm is a divide and conquers algorithm; it divides the list into smaller sublists, then takes a pivot element and sorts it into higher and lower groups, and then nests the quick sort into newly formed groups till the goal is achieved.

### What is the advantage of doubly linked list over singly linked list?

The advantages of using a doubly linked list over a singly linked list include the ability to efficiently traverse the list in both directions, faster deletion of nodes, and increased flexibility in certain programming applications.

### Conclusion

So, this blog discussed the difference between a singly linked list and a doubly linked list. To learn more topics like Linked ListGraphsTrees, head over right now to Coding Ninjas Studio and crack your interviews like a Ninja!

Practicing a bunch of questions is not enough in this competitive world. So go check out where you stand among your peers by taking our mock tests and see which areas need improvement.

Problems on Singly Linked List

Problems on Doubly Linked List

Do check out The Interview guide for Product Based Companies as well as some of the Popular Interview Problems from Top companies like Amazon, Adobe, Google, Uber, Microsoft, etc. on Coding Ninjas Studio.

Also check out some of the Guided Paths on topics such as Data Structure and Algorithms, Competitive Programming, Operating Systems, Computer Networks, DBMS, System Design, etc. as well as some Contests, Test Series, Interview Bundles, and some Interview Experiences curated by top Industry Experts only on Coding Ninjas Studio.

Do you know how to implement a Linked List? Let's watch the below video to understand it beforehand.

In case of any comments or suggestions, feel free to post them in the comments section.

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