Linked Lists Interview Questions | Data-Structures | NextRound

1What is a Sentinel Node/Dummy Node? Why is it useful?Beginner

2Why is insertion/deletion at the head of a Linked List O(1)?Beginner

3Why is accessing an element in a Linked List O(n)?Beginner

4How do you reverse a Linked List? (Iterative and Recursive)Beginner

5How do you copy a Linked List with random pointers? (Deep Copy)Advanced

6When would you choose a Linked List over an Array?Intermediate

7What are the types of Linked Lists? (Singly, Doubly, Circular)Beginner

8What is an XOR Linked List? Why is it rarely used?Intermediate

9What is a Skip List? How does it improve search time?Intermediate

10Explain the difference between a Linked List and an Unrolled Linked List.Intermediate

11Why does the standard library (Java/C#) not heavily feature Linked Lists? (Cache locality issues)Intermediate

12How do you find the middle of a Linked List in one pass?Beginner

13What is a Linked List? How does it differ from an Array?Beginner

14How do you detect a cycle in a Linked List? (Floyd's Tortoise and Hare)Beginner

15Explain why QuickSort is preferred over MergeSort for Arrays, but MergeSort is preferred for Linked Lists.Intermediate

16How do you merge two sorted Linked Lists?Beginner