I will list down some problems on the topic of linked lists that are commonly asked in interviews.

Important concepts to revise before trying out the problems:

• Linked List

• Node of a Linked List

• Singly Linked List

• Doubly Linked List

• Inserting and deleting nodes in a Linked List

• Runner technique - There will be more pointers and they will move forward at different speeds.

Problems

1. Reverse a linked list

2. Remove duplicates from a sorted linked list.

3. Remove duplicates from an unsorted linked list.

4. Find the Kth to last element in a linked list

5. Delete a node in the middle of a singly linked list, given only access to that node.

6. Given a linked list with a loop (circular linked list), find the node at the beginning of the loop.

7. Partitian a linked list around a given value x, with all nodes with values less than x should come before all nodes with values greater than or equal to x.

8. Given two sorted (ascending) linked lists L1 and L2. Write a program to merge them into a single descending linked list. 

   • Example:

     • List1 = 5>15>25>35>null.

     • List2 = 1>10>20>30>null.

     • ResultList = 35>30>25>20>15>10>5>1>null.

9. Find the middle element of linked list in one Pass?

Important Note!

• I will add more to the list whenever I come across a new one.

• If you were asked a problem not listed here, please let us know and we will add it here. You will also receive points. If you can provide a good solution and explanation also for your problem, you will get extra points and even cash prizes.