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DIY: Add Two Numbers II

Explore how to implement adding two non-empty linked lists representing non-negative integers in Scala. Learn to handle nodes storing digits with the most significant digit first and return their sum as a linked list. This lesson enhances linked list manipulation and problem-solving skills relevant for coding interviews.

Problem statement

Given two non-empty linked lists representing two non-negative integers, you have to add the two numbers and return the sum as a linked list. The digits are stored in such a way that the most significant digit comes first, and each of their nodes contains a single digit.

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