Add Two Numbers represented as Linked List

Problem

You are given two linked lists representing two non-negative numbers.

Problem 1 - The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

Solution: Add Two Numbers represented as Linked List in Reversed Order

Problem 2 - The digits are given in forward order Solution: Add Two Numbers represented as Linked List in Forward order