Merge Two Sorted Linked Lists | Coding Interview Prep | HackerRank & LeetCode Solution

Published: 31 October 2023
on channel: Programming with Sikander

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In this tutorial, Sikander provides a step-by-step guide to solving one of the most frequently asked technical interview questions: Merging two sorted linked lists. This problem is a staple on platforms like HackerRank and LeetCode.
What you will learn in this session:
• The Core Problem: How to take two pointers to the heads of sorted lists and combine them into a single, sorted linked list.
• Efficient Memory Usage: We demonstrate how to solve this without creating new nodes, purely by modifying the existing links between nodes.
• Handling Edge Cases: Learn how to manage boundary conditions, such as when one or both lists are empty (null pointers).
• Step-by-Step Logic:
◦ Comparing initial head data to set the new head3 pointer.
◦ Using a current pointer to traverse and link the remaining nodes.
◦ Dealing with "leftover" nodes when one list finishes before the other.
• Visual Debugging: Watch a detailed Microsoft Visual Studio walkthrough using the Watch Window to see exactly how addresses and pointers change at every step.
• Cross-Platform Submission: See how the same logic is applied and adapted for both HackerRank and LeetCode, including minor adjustments for data member names like data vs val.
Whether you are a student or a job seeker, mastering this logic is essential for understanding dynamic data structures.

Problem Statement:
Hackerrank : https://www.hackerrank.com/challenges...
LeetCode : https://leetcode.com/problems/merge-t...

Link to Code :
https://onlinegdb.com/u3ss-b0xn

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