I recently participated in an interview process that included two distinct rounds: a technical round and a managerial round.

The technical round primarily focused on evaluating my knowledge and skills related to computer science, especially in areas such as programming, algorithms, and problem-solving. The questions were challenging but not overly difficult, allowing me to showcase my understanding of key concepts.

The managerial round, on the other hand, was more about assessing my soft skills, such as communication, teamwork, and how I handle different situations. This round involved discussions about how I approach problem-solving in a team setting, and how I manage tasks and responsibilities. The interviewer was interested in understanding my leadership abilities, decision-making process, and how I adapt to various challenges.

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.

You may assume the two numbers do not contain any leading zero, except the number 0 itself.