55 Must-Know Linked Lists Interview Questions and Answers 2024

Basics of Linked Lists

1.
What is a Linked List?
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2.
What are some pros and cons of Linked List compared to Arrays?
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3.
Explain the difference between Singly Linked Lists and Doubly Linked Lists.
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4.
How does a Linked List manage memory allocation differently from an Array?
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5.
What are the basic operations that can be performed on a Linked List?
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Advantages and Use Cases of Linked Lists

6.
What are some real-life Use Cases of Linked Lists?
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7.
When is a Circular Linked List useful?
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8.
When is Doubly Linked List more efficient than Singly Linked List?
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9.
Describe a scenario where the use of a Linked List is more suitable than a Dynamic Array.
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Linked Lists vs. Other Data Structures

10.
Compare Array-based vs Linked List stack implementations.
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11.
How do Linked Lists perform in comparison with Trees for various operations?
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12.
When would you use a Linked List over a Hash Table?
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Traversal and Search in Linked Lists

13.
Is it possible to Traverse a Linked List in O(n1/2)? (Jump Pointers).
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14.
How to apply Binary Search in O(log n) on a Sorted Linked List? (Skip Lists).
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15.
Is it possible to do Binary Search on a Doubly Linked List in O(n) time?
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16.
Implement a method to find the middle element of a Linked List.
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Implementations and Conversions

17.
Implement a Linked List using Stack.
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18.
Reverse a Singly Linked List using only Two Pointers.
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19.
Convert a Singly Linked List to a Circular Linked List.
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20.
Convert a Singly Linked List to a Doubly Linked List.
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21.
Implement a Doubly Linked List using Stacks with minimal complexity.
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22.
Convert a Binary Tree into a Doubly Linked List.
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Insertion and Deletion

23.
Implement a method to Insert a node at a specific position in a Linked List.
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24.
Describe how to Delete a node in a Linked List without having a head pointer.
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25.
Implement an efficient function to Append a node to the end of a Linked List.
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26.
Insert an item in a Sorted Linked List, while maintaining order.
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Algorithms on Linked Lists

27.
Explain Floyd’s Cycle Detection Algorithm.
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28.
Is there an algorithm Better Than Floyd’s for Cycle Detection in linked lists?
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29.
Write an algorithm to Shuffle a Linked List.
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30.
Detect if a List is Cyclic using a Hash Table.
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31.
Implement an algorithm to Sort a Linked List.
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Merging and Reversing

32.
Merge two sorted Singly Linked Lists without creating new nodes.
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33.
Reverse a Linked List recursively.
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34.
Write a function that Reverse K nodes of the Linked List at a time.
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Advanced Manipulations

35.
Find the N-th element from the end of a Singly Linked List.
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36.
Remove Duplicates from an Unsorted Linked List.
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37.
Find Common Elements in two given Linked Lists and return them as a new Linked List.
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38.
Split the Linked List into k consecutive parts.
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39.
Sum two numbers represented as Linked Lists.
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Special Cases and Challenges

40.
Find a Merge Point (Intersection) of two Linked Lists.
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41.
Given a Singly Linked List, determine if it is a Palindrome.
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42.
Find the length of a Linked List that contains a Cycle.
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43.
Duplicate a Linked List with Random Pointers using O(1) space.
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44.
Implement a function to check if two Singly Linked Lists intersect without using extra space.
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45.
How would you rotate a Linked List by k places?
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Complexity and Analysis

46.
Discuss the Time Complexity of various operations in Linked Lists.
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47.
Assess the Space Complexity of a Linked List with auxiliary pointers, such as in a Skip List.
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48.
Explain how Recursion affects time and space complexity in Linked List operations.
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Linked List Problems and Solutions

49.
Solve the problem of finding the Intersection Point of a Y-shaped Linked List.
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50.
Write an algorithm to segregate even and odd nodes in a Singly Linked List.
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51.
How can you sort a Linked List that is sorted alternating between ascending and descending orders?
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52.
Develop a method to swap pairs of nodes in a Linked List.
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53.
Implement an algorithm to remove all Odd-Indexed Nodes from a Linked List.
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54.
Describe a technique to randomly select a node from a Linked List with a uniform distribution.
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55.
Implement a version of a Linked List where each node has an additional arbitrary pointer to within the list.
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55 Linked Lists interview questions

What is a Linked List?

What are some pros and cons of Linked List compared to Arrays?

Explain the difference between Singly Linked Lists and Doubly Linked Lists.

How does a Linked List manage memory allocation differently from an Array?

What are the basic operations that can be performed on a Linked List?

What are some real-life Use Cases of Linked Lists?

When is a Circular Linked List useful?

When is Doubly Linked List more efficient than Singly Linked List?

Describe a scenario where the use of a Linked List is more suitable than a Dynamic Array.

Compare Array-based vs Linked List stack implementations.

How do Linked Lists perform in comparison with Trees for various operations?

When would you use a Linked List over a Hash Table?

Is it possible to Traverse a Linked List in O(n1/2)? (Jump Pointers).

How to apply Binary Search in O(log n) on a Sorted Linked List? (Skip Lists).

Is it possible to do Binary Search on a Doubly Linked List in O(n) time?

Implement a method to find the middle element of a Linked List.

Implement a Linked List using Stack.

Reverse a Singly Linked List using only Two Pointers.

Convert a Singly Linked List to a Circular Linked List.

Convert a Singly Linked List to a Doubly Linked List.

Implement a Doubly Linked List using Stacks with minimal complexity.

Convert a Binary Tree into a Doubly Linked List.

Implement a method to Insert a node at a specific position in a Linked List.

Describe how to Delete a node in a Linked List without having a head pointer.

Implement an efficient function to Append a node to the end of a Linked List.

Insert an item in a Sorted Linked List, while maintaining order.

Explain Floyd’s Cycle Detection Algorithm.

Is there an algorithm Better Than Floyd’s for Cycle Detection in linked lists?

Write an algorithm to Shuffle a Linked List.

Detect if a List is Cyclic using a Hash Table.

Implement an algorithm to Sort a Linked List.

Merge two sorted Singly Linked Lists without creating new nodes.

Reverse a Linked List recursively.

Write a function that Reverse K nodes of the Linked List at a time.

Find the N-th element from the end of a Singly Linked List.

Remove Duplicates from an Unsorted Linked List.

Find Common Elements in two given Linked Lists and return them as a new Linked List.

Split the Linked List into k consecutive parts.

Sum two numbers represented as Linked Lists.

Find a Merge Point (Intersection) of two Linked Lists.

Given a Singly Linked List, determine if it is a Palindrome.

Find the length of a Linked List that contains a Cycle.

Duplicate a Linked List with Random Pointers using O(1) space.

Implement a function to check if two Singly Linked Lists intersect without using extra space.

How would you rotate a Linked List by k places?

Discuss the Time Complexity of various operations in Linked Lists.

Assess the Space Complexity of a Linked List with auxiliary pointers, such as in a Skip List.

Explain how Recursion affects time and space complexity in Linked List operations.

Solve the problem of finding the Intersection Point of a Y-shaped Linked List.

Write an algorithm to segregate even and odd nodes in a Singly Linked List.

How can you sort a Linked List that is sorted alternating between ascending and descending orders?

Develop a method to swap pairs of nodes in a Linked List.

Implement an algorithm to remove all Odd-Indexed Nodes from a Linked List.

Describe a technique to randomly select a node from a Linked List with a uniform distribution.

Implement a version of a Linked List where each node has an additional arbitrary pointer to within the list.

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