How should I practice Add Two Numbers II?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Bloomberg LP phone screen and onsite interview problems in FastPrep.

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Add Two Numbers II

Bloomberg LP● MediumNEW GRADFULLTIMEPHONE SCREENONSITE INTERVIEW

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Problem statement

Two nonnegative integers are stored in forward digit order in linked lists l1 and l2. Return their sum as a forward-order digit list.

Do not reverse or mutate the input lists.

Function

addTwoNumbersForward(l1: ListNode, l2: ListNode) → ListNode

Examples

Example 1

l1 = [7,2,4,3]l2 = [5,6,4]return = [7,8,0,7]

7243 + 564 = 7807.

Example 2

l1 = [9,9]l2 = [1]return = [1,0,0]

The final carry becomes the new head.

Constraints

Each list has between 1 and 100 nodes.
Every node value is a decimal digit.