Hackerrank Solution | Insert node at head of linkedlist #vineetbhardwajtrainer

Welcome to this tutorial on solving a classic linked list problem from HackerRank! In this video, we’ll be tackling a problem where you are asked to insert multiple elements at the head of a linked list. Problem Overview: You’re given an integer n, which represents the number of elements to be inserted. For each insertion, a new element is added at the head of the list, pushing the existing elements further back. The goal is to form a linked list where the most recently inserted element appears first. Problem Input: The first line contains an integer n (the number of elements to insert). The next n lines contain the integers to be inserted, one at a time. Constraints: The input will follow the structure mentioned above. The goal is to insert elements into the list from head to tail as described. Sample Input: 5 383 484 392 975 321 Sample Output: 321 -- 975 -- 392 -- 484 -- 383 -- NULL Explanation: 1. Initially, the list is empty (NULL). 2. After inserting the first element, 383, the list is: 383 -- NULL. 3. Inserting 484 results in: 484 -- 383 -- NULL. 4. Inserting 392: 392 -- 484 -- 383 -- NULL. 5. Inserting 975: 975 -- 392 -- 484 -- 383 -- NULL. 6. Finally, inserting 321 results in: 321 -- 975 -- 392 -- 484 -- 383 -- NULL. In this video, we will walk through the entire solution step-by-step, starting with understanding the problem and moving on to implementing the solution in code. We’ll cover: How to implement a linked list. The process of inserting nodes at the head. Reviewing test cases and understanding the output format. What You’ll Learn: By the end of this tutorial, you'll know how to: Insert elements efficiently at the head of a linked list. Handle dynamic data structures like linked lists in coding problems. Solve similar linked list-based problems using the same approach. Timestamps: 00:00 Introduction to the Problem 1:30 function signature 2:50 code If you found this video helpful, don’t forget to like, subscribe, and share for more coding tutorials and HackerRank problem solutions! #vineetbhardwajtrainer #Vineet #trainer #dsa #hackerranksolution #HackerRank #LinkedList #HeadInsertion #CodingChallenge #DataStructures #ProgrammingTutorial