2. Add Two Numbers

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Two non-negative integers are stored as linked lists, one digit per node, with the least significant digit first. Add the two numbers and return the sum as a linked list in the same format. Neither input has leading zeros, except the number 0 itself.

Example

l1 = [2,4,3], l2 = [5,6,4]  ->  [7,0,8]   (342 + 465 = 807)

Constraints