In this problem, we solve LeetCode Problem 2: Add Two Numbers.
You are given two linked lists where each node contains a single digit and the digits are stored in reverse order.
You need to add the two numbers and return the result as a linked list.
Key idea:
β Traverse both lists together
β Add digits along with a carry
β Create new nodes for each digit of the sum
This is a classic linked list + math problem and one of the most popular interview questions.
Practice it on LeetCode π
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