Add Two Numbers II You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first 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: l1 = [7,2,4,3], l2 = [5,6,4] Output: [7,8,0,7]
Example 2:
Input: l1 = [2,4,3], l2 = [5,6,4] Output: [8,0,7]
Example 3:
Input: l1 = [0], l2 = [0] Output: [0]
Constraints:
- The number of nodes in each linked list is in the range
[1, 100]
. 0 <= Node.val <= 9
- It is guaranteed that the list represents a number that does not have leading zeros.
Add Two Numbers II Solutions
✅Time: O(n)
✅Space: O(n)
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