Took the OA yesterday. Got 2 question I was already familar with from here so thought I should return the favor.

1. LinkedListSum - https://leetcode.com/discuss/interview-question/1546673/Amazon-or-OA-or-LinkedListSum
2. Valid Discount Coupon - https://leetcode.com/discuss/interview-question/1557009/Amazon-or-OA-or-Valid-string

I was able to pass all test cases.