Add Two Integers Represented by Linked Lists

Given the head pointers of two linked lists where each linked list represents an integer number (each node is a digit), add them and return the resulting number in a linked list.

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Statement

We are given the head pointers of two linked lists, each linked list represents an integer number (each node is a digit). Add them and return the resulting linked list (i.e., sum).

Here, the first node in a list represents the least significant digit.

Example

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