LeetCode 21: Merge Two Sorted Lists (Most Asked) | DSA Linked List Series

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Practise Link: https://leetcode.com/problems/merge-t...
In this video, we learn how to merge two sorted linked lists into a single sorted linked list. This is a classic linked list interview problem, and I’ve explained it using two different approaches — from the brute force idea to the optimal pointer-based solution.

What this video covers
1. Brute Force Approach
Copy both linked lists into a temporary array
Sort the array using merge sort or quick sort
Build a new linked list from the sorted array
Time complexity: O(n + m · log(n + m))
Space complexity: O(n + m)

2. Optimal Pointer Manipulation Approach
No extra space required
Use two pointers to merge the lists in a sorted manner
Operates in O(n + m) time and O(1) extra space

Fully explained with visuals and step-by-step logic

Why this matters
This technique is widely used in DSA and is an essential foundation for problems like merge sort on linked lists, removing duplicates, and merging k sorted lists.

Timeline
Brute force idea and complexity
Pointer-based efficient solution
Pseudo Code

Playlists
DSA Playlist:    • DSA Problems  
LinkedList Playlist:    • LinkedList Problem Solving Series  

Code
👉 Solution: Pinned on the comments

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