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DIY: Add Two Numbers

Understand how to implement a function that adds two non-negative integers represented as linked lists in reverse order. Explore edge cases such as differing list lengths and carry-over scenarios to return the sum as a linked list.

Problem statement

Given two non-empty linked lists that represent two non-negative integers, you have to add the two numbers and return the sum as a linked list. The digits are stored in reverse order, and each of their nodes contains a single digit.

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

Constraints