🎯 LeetCode Problem 21 – Merge Two Sorted Lists | Linked List Explained Step-by-Step | DSA with Java

In this video, we solve LeetCode 21: Merge Two Sorted Lists, one of the most fundamental Linked List problems often asked in coding interviews. You’ll learn both iterative and recursive approaches with full code explanation and dry run. 💡 Problem Description You are given the heads of two sorted linked lists list1 and list2. Merge the two lists into one sorted list. The new list should be made by splicing together the nodes of the first two lists. Return the head of the merged linked list. 📘 Example 1 Input: list1 = [1,2,4], list2 = [1,3,4] Output: [1,1,2,3,4,4] 📘 Example 2 Input: list1 = [], list2 = [] Output: [] 📘 Example 3 Input: list1 = [], list2 = [0] Output: [0] ⚙️ Constraints Number of nodes in both lists: [0, 50] Node values range: -100 ≤ Node.val ≤ 100 Both list1 and list2 are sorted in non-decreasing order 📚 Topics Covered: Linked List | Two Pointers | Sorting | Recursion | Iteration | Data Structures | LeetCode Easy Problems 🔥 Tags / Hashtags: #LeetCode #LeetCodeSolutions #MergeTwoSortedLists #LinkedList #TwoPointers #DataStructures #CodingInterview #Java #CPlusPlus #Python #DSA #Algorithms #LeetCodeEasy #CodingTutorial 🎓 Who is this for? Beginners in CSE, IT, BCA, MCA Students preparing for placements & coding interviews Developers building skills in Java, C++, Python, Kotlin, Dart, JavaScript, TypeScript Enthusiasts exploring Stock Markets & Trading Tools Anyone who wants to code smarter & trade smarter 💡 Tip for Success: 👉 “The more you practice, the better you become.” Keep coding, solving problems, and building your foundation strong! 📌 Resources & My Work 🔗 GitHub Codes: https://github.com/farhaddubey 🌐 Connect With Me LinkedIn: linkedin.com/in/farhaddubey Instagram: instagram.com/farhaddubey GitHub: github.com/farhaddubey X (Twitter): x.com/farhaddubey 📌 Tags DSA in Java, C++, Python, Kotlin, Dart, JavaScript, TypeScript Coding interview preparation Crack tech interviews Learn coding from scratch Software engineering interviews Placement prep Web & App Development React.js, Next.js, Flutter apps Trading tools explained Stock market basics Tech + Finance + Coding DSA crash course Competitive programming Code smarter, trade smarter