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Linked List Interview Questions and Answers

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Ques 1. 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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Ques 2. Check if a linked list is a palindrome.

Reverse the second half of the list and compare it with the first half.

Example:

Input: 1 -> 2 -> 3 -> 2 -> 1
Output: True

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Ques 3. Swap nodes in pairs in a linked list.

Iterate through the list and swap each pair of adjacent nodes.

Example:

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

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Ques 4. 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 5. 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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