How should I practice Add Two Numbers?

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

Bloomberg LP● MediumNEW GRADPHONE SCREENONSITE INTERVIEW

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Problem statement

Two nonnegative integers are stored in reverse digit order in linked lists l1 and l2. Each node stores one digit.

Return their sum as a reverse-order digit linked list. Neither input has leading zeroes except the number zero.

Function

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

Examples

Example 1

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

342 + 465 = 807.

Example 2

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

The final carry creates a new node.

Constraints

Each list has between 1 and 100 nodes.
Every node value is between 0 and 9.