Add Two Numbers

Challenge Points: 20

Level: Medium

You are given two non-empty linked lists representing two non-negative integers.

· Each node contains a single digit.

· The digits are stored in reverse order.

Add the two numbers and return the total as a linked list in reverse order.

You can assume both numbers have no leading zeros, except when the number itself is 0.

Input: l1 = [4,3,2], l2 = [7,6,5]

Output: [1,0,8]

Explanation:

The numbers are 234 and 567. 234 + 567 = 801, stored in reverse as [1,0,8].

Input: l1 = [9,9], l2 = [1]

Output: [0,0,1]

Explanation:

99 + 1 = 100, reverse is [0,0,1].

Input: l1 = [5,5,5,5], l2 = [5,5,5]

Output: [0,1,1,6]

Explanation:

555 + 555 = 6110, reverse is [0,1,1,6].

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