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Solution: Add Two Numbers

Explore how to add two numbers stored as linked lists in reverse order by simulating digit-by-digit addition, handling carry, and constructing the result list. Learn an efficient algorithm that processes each node once with constant space usage.

Statement

You are given two non-empty linked lists, where each list represents a non-negative integer.
The digits are stored in reverse order, and each node contains exactly one digit.

Your task is to add the two integers and return the result as a linked list, also stored in reverse order. ...