250. Add Two Numbers II
MediumLinked List
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.
Examples
Input: [7,2,4,3] [5,6,4]
Output: [7,8,0,7]
Explanation: 7243 + 564 = 7807.
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.
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