Linked Lists are an important concept to prepare for technical interviews at FAANG+ companies. Knowing how Linked Lists work is crucial to solving complex problems at FAANG+ interviews. Linked List interview questions are typically asked during coding rounds of technical interviews, i.e., during the technical phone screen and on-site interview rounds.
FAANG+ companies often test your knowledge of different data structures in coding rounds, including arrays, Linked Lists, Graphs, Trees, and Has tables, among other concepts. This article will give you an idea of the type of Linked List interview questions asked in technical interviews.
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Let’s look at some popular Linked List interview questions for your upcoming technical interview.
Here’s what we’ll discuss in this article:
A Linked List is a linear data structure representing a collection of data elements. Linked Lists are used to store objects of a certain type and can be made to grow or shrink in size at runtime, based on allocated memory.
This section will look at some common and basic Linked List interview questions for freshers.
When a new node is inserted into a Linked List, free nodes are made available in the Avail List.
This is one of the most common Linked List interview questions asked in technical interviews. The four types of Linked Lists include:
Some main applications of Linked Lists include:
A Singly Linked List is a type of Linked List that contains the pointer to the next node in the list. A singly linked list is unidirectional. It can be traversed only in one direction from the first to the last node.
A Doubly Linked List can be navigated in both directions - either forward or backward. Doubly Linked Lists are preferred to singly linked lists because they’re easier to implement and debug. A doubly linked list contains pointers to the next node and the previous node, unlike the singly linked list.
A Circular Linked List is where the last element in the list points to the first element and vice versa. These types of Linked Lists are flexible - both Singly linked lists and Doubly Linked Lists can be converted into Circular Linked Lists.
A Doubly Linked List contains the following main fields:
The Grounded Header List contains the last node of the list.
Traversal in Linked Lists is the method involved in processing every single element in the list and returning appropriate values during program execution.
There are three main pointers used to represent a Singly Linked List. They are:
In this section, we’ll look at some advanced Linked List interview questions for experienced programmers.
These above Linked List interview questions are everything you need to prepare for your tech interview thoroughly.
Q1. Why should you prepare Linked List interview questions for technical interviews?
FAANG+ companies frequently ask Linked List interview questions and problems around other data structures, including Graphs, Hash Tables, Trees, Strings, and Arrays, in coding interviews. To ace these interviews, having a good hold on data structures and algorithms concepts is crucial.
Q2. What type of memory allocation is relevant while using Linked Lists in programs?
While working with Linked Lists, the type of memory allocation used is dynamic memory allocation.
Q3. What are the fundamental differences between Linked Lists and Arrays?
This is a common Linked List interview question asked in technical interviews. The main differences between Linked Lists and Arrays mostly pertain to memory allocation and traversal. Linked Lists consume more memory when compared to arrays. Traversals are more time-consuming in the case of Linked Lists when compared to Arrays.
Q4. Are Linked List interview questions asked in systems design interviews?
No, Linked List interview questions are mostly asked in coding interviews and not much in systems design interviews. You can expect coding problems on Linked Lists during Technical Phone Screen and Coding Rounds of On-site interviews.
Q5. Why are Doubly Linked Lists preferred to Single Linked Lists?
Doubly Linked Lists are preferred because they are easier to implement and debug, even though the length of code associated with Doubly Linked Lists is longer.
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