You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.
Example 1:
Input: list1 =[2, 4, 3], list2 =[5, 6, 4]Output:[7, 0, 8]Explanation: 342 + 465 = 807
Example 2:
Input: list1 =[9,9,9,9,9,9,9], list2 =[9,9,9,9]Output:[8,9,9,9,0,0,0,1]Explanation: 9999999 + 9999 = 10009998
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