Mastering Linked List: 105 Interview Questions for DSA Success

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Linked List: 105 Interview Questions for DSA Success

1. Linked List Basics

Introduction to Linked Lists
Creating a Singly Linked List
Traversing a Linked List
Inserting at the Beginning
Inserting at the End
Inserting at a Given Position
Deleting a Node by Value
Deleting a Node by Position
Deleting the First Node
Deleting the Last Node

2. Search and Length Operations

Searching for an Element in a Linked List
Finding the Length of a Linked List
Counting Occurrences of a Given Element
Finding the Middle of a Linked List
Finding the Nth Node from the End
Detecting a Loop in a Linked List (Floyd’s Cycle Detection)
Removing a Loop in a Linked List
Finding the Start of a Loop
Checking if a Linked List is Circular
Checking if a Linked List is a Palindrome

3. Linked List Reversal

Reversing a Linked List Iteratively
Reversing a Linked List Recursively
Reversing a Linked List in Groups of K
Reversing Alternate K Nodes
Reversing the First Half of the Linked List
Reversing the Second Half of the Linked List
Reverse Nodes Between M and N
Reverse Every Alternate Node in a Linked List
Reverse Pairs in a Linked List
Reverse a Doubly Linked List

4. Linked List with Recursion

Recursive Approach to Traversal
Recursive Approach to Search
Recursive Approach to Insertion
Recursive Approach to Deletion
Recursive Merge of Two Sorted Linked Lists
Recursive Reversal of a Linked List
Recursive Approach to Flatten a Multilevel Linked List
Recursive Palindrome Check
Recursive Segregation of Even and Odd Nodes
Recursive Pairwise Swap of Nodes

5. Two-Pointer Techniques in Linked Lists

Finding the Intersection of Two Linked Lists
Detecting and Removing Loop (Two-Pointer Method)
Finding the Middle Node (Tortoise and Hare Approach)
Merging Two Sorted Linked Lists
Detecting Intersection in Circular Linked Lists
Reordering Linked List (Odd-Even Nodes)
Sorting a Linked List Using Merge Sort (Two-Pointers)
Quick Sort on Linked List Using Two Pointers
Reversing Nodes in a Linked List with Two Pointers

6. Advanced Linked List Operations

Merge K Sorted Linked Lists
Flattening a Multilevel Linked List
Clone a Linked List with Random Pointers
Rotate a Linked List Left by K Positions
Rotate a Linked List Right by K Positions
Segregate Even and Odd Nodes in a Linked List
Add Two Numbers Represented by Linked Lists
Subtract Two Numbers Represented by Linked Lists
Multiply Two Numbers Represented by Linked Lists
Divide Two Numbers Represented by Linked Lists

7. Circular Linked Lists

Introduction to Circular Linked Lists
Creating a Circular Linked List
Insertion at the Beginning of a Circular Linked List
Insertion at the End of a Circular Linked List
Deletion from a Circular Linked List
Converting a Singly Linked List to a Circular Linked List
Splitting a Circular Linked List into Two Halves
Josephus Problem in Circular Linked List
Detecting Loop in a Circular Linked List
Traversing a Circular Linked List

8. Doubly Linked Lists

Introduction to Doubly Linked Lists
Creating a Doubly Linked List
Insertion at the Beginning of a Doubly Linked List
Insertion at the End of a Doubly Linked List
Insertion After a Given Node in a Doubly Linked List
Deletion of a Node from a Doubly Linked List
Reversing a Doubly Linked List
Flattening a Doubly Linked List
Converting a Binary Tree to a Doubly Linked List
Traversing a Doubly Linked List in Both Directions

9. Specialized Linked Lists

Skip List Implementation
XOR Linked List (Memory Efficient Doubly Linked List)
Flattening a Linked List with Child Pointers
LRU Cache Implementation Using Doubly Linked List
Implementing Stack Using Linked List
Implementing Queue Using Linked List
Convert Binary Numbers in Linked List to Integer
Clone a Multilevel Linked List
Add 1 to a Number Represented by Linked List
Implementing a Priority Queue Using Linked List

10. Complex Problems on Linked Lists

Intersection Point of Y-Shaped Linked Lists
Swapping Nodes in a Linked List Without Swapping Data
Rotate a Linked List in Blocks of K
Delete Nodes Which Have Greater Value on the Right Side
Delete N Nodes After M Nodes
Flatten a Linked List Where Each Node Has a Next and Child Pointer
Segregate 0s, 1s, and 2s in a Linked List
Flatten a Linked List of Linked Lists
Convert a Sorted Linked List to a Balanced BST
Rearrange a Linked List in Zig-Zag Fashion

11. More Essential Interview Questions:

Implement a Function to Merge Two Sorted Linked Lists Without Using Extra Space.
Find the Intersection Node of Two Linked Lists Using Length Difference.
Check for Overlapping Cycles in Two Linked Lists.
Remove Duplicates from an Unsorted Linked List.
Find and Remove the Kth Node from the End in One Pass.
Create a Copy of a Linked List with a Random Pointer in O(n) Time.

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