Add Two Numbers Linked List Gfg Practice

Understanding the Problem

Adding two numbers represented as linked lists is a common problem in coding interviews and practice platforms like GFG. In this problem, each node in the linked list represents a digit in the number, and the digits are stored in reverse order. For example, the number 123 would be represented as a linked list with nodes 3 -> 2 -> 1. The goal is to add two such numbers and return the result as a linked list.

The key to solving this problem is to iterate through the linked lists, add corresponding nodes, and handle any carry-over values. This can be achieved by using a simple iterative approach, where we traverse the linked lists from left to right, adding the values of the nodes and any carry-over from the previous iteration.

Solution and Implementation

To solve this problem, we need to consider a few key things. First, we need to handle the case where the linked lists are of different lengths. We also need to consider the case where the sum of two nodes is greater than 9, which would result in a carry-over value. By taking these factors into account, we can develop a solution that works for all possible inputs.

One way to implement the solution is to use a simple iterative approach, where we traverse the linked lists from left to right, adding the values of the nodes and any carry-over from the previous iteration. We can use a dummy node to simplify the code and avoid having to deal with special cases for the head of the list. By using this approach, we can develop a solution that is both efficient and easy to understand.