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WithoutBook LIVE Mock Interviews Linked List Related interview subjects: 74

Interview Questions and Answers

Know the top Linked List interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 15 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Linked List interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

Ques 1

Find the kth to last element of a singly linked list.

Use two pointers; one moves k nodes into the list, and then both iterate until the second one reaches the end.

Example:

Input: 1 -> 2 -> 3 -> 4 -> 5, k = 2
Output: 4
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Ques 2

Remove duplicates from an unsorted linked list.

Use a hash set to keep track of unique elements while traversing the list.

Example:

Input: 1 -> 2 -> 2 -> 3 -> 4 -> 4 -> 5
Output: 1 -> 2 -> 3 -> 4 -> 5
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Ques 3

Write a function to find the middle element of a linked list.

Use two pointers; one moves one step at a time, and the other moves two steps at a time.

Example:

Input: 1 -> 2 -> 3 -> 4 -> 5
Output: 3
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 4

Implement a function to reverse a singly linked list.

To reverse a linked list, you can iterate through the list and reverse the direction of pointers.

Example:

Input: 1 -> 2 -> 3 -> 4 -> 5
Output: 5 -> 4 -> 3 -> 2 -> 1
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Ques 5

Detect a cycle in a linked list.

You can use Floyd's cycle-finding algorithm, also known as the 'tortoise and hare' algorithm.

Example:

Input: 1 -> 2 -> 3 -> 4 -> 5 -> 2 (cycle)
Output: True
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Ques 6

Merge two sorted linked lists into a single sorted list.

Traverse both lists simultaneously, compare elements, and merge them into a new sorted list.

Example:

Input: List1: 1 -> 3 -> 5, List2: 2 -> 4 -> 6
Output: 1 -> 2 -> 3 -> 4 -> 5 -> 6
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Ques 9

Rotate a linked list by k places.

Find the length of the list, then move (length - k % length) steps to the right.

Example:

Input: 1 -> 2 -> 3 -> 4 -> 5, k = 2
Output: 4 -> 5 -> 1 -> 2 -> 3
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Ques 10

Detect the intersection point of two linked lists.

Find the lengths of both lists, move the longer list's pointer ahead, and then iterate to find the intersection.

Example:

Input: List1: 1 -> 2 -> 3, List2: 6 -> 5 -> 2 -> 3
Output: Node with value 2
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Experienced / Expert level questions & answers

Ques 11

Implement a function to add two numbers represented by linked lists.

Traverse both lists simultaneously, perform addition, and handle carry.

Example:

Input: (7 -> 2 -> 4) + (5 -> 6 -> 4)
Output: 2 -> 9 -> 8
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Ques 12

Clone a linked list with next and random pointers.

Create a copy of each node and link the copies, then separate the original and cloned lists.

Example:

Input: 1 -> 2 -> 3 -> 4
Output: 1' -> 2' -> 3' -> 4'
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Ques 13

Flatten a multilevel doubly linked list.

Use recursion to flatten each level and connect the flattened levels.

Example:

Input: 1 <-> 2 <-> 3 <-> 7 <-> 8 <-> 11 <-> 4 <-> 9 <-> 12
Output: 1 <-> 2 <-> 3 <-> 4 <-> 7 <-> 8 <-> 9 <-> 11 <-> 12
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Ques 14

Implement LRU (Least Recently Used) Cache using a linked list.

Maintain a doubly linked list to represent usage order and a hash map for quick access.

Example:

Cache capacity = 3
Operations: Get(2), Put(2, 6), Get(1), Put(1, 5), Put(1, 2)
Output: 6, 5, 2
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