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

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