Add Two Numbers: coding question

Problem

You get l1 and l2, the heads of two non-empty linked lists. A linked list is a chain of nodes, and each node links to the next node.

Each list shows a non-negative integer. Each node holds one digit, and the digits are in reverse order. Thus, the first node holds the ones digit.

Add the two integers, and return the sum as a linked list in the same form. A number does not start with the digit 0, except the number 0 itself.

SysRound wrote this statement. A reference solution checks every example.

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Problem

You get l1 and l2, the heads of two non-empty linked lists. A linked list is a chain of nodes, and each node links to the next node.

Each list shows a non-negative integer. Each node holds one digit, and the digits are in reverse order. Thus, the first node holds the ones digit.

Add the two integers, and return the sum as a linked list in the same form. A number does not start with the digit 0, except the number 0 itself.

SysRound wrote this statement. A reference solution checks every example.