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Solution: Add Two Numbers

Understand how to add two numbers stored as reversed linked lists without converting them to integers. Learn the algorithm to sum digits node by node, manage carryover, and build the result list efficiently while keeping time complexity optimal.

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. ...