Amazon Software Development Engineer, interview questions

I was offered to interview on campus without a phone screen, flight and hotel paid for. The process consisted of several 45-min 1:1 technical interviews, and the questions were not incredibly difficult (mainly dealing with data structures and algorithms). However, it felt like some of the interviewers were expecting very specific answers and couldn't understand my thought process (when it didn't match theirs exactly). Half of the interviewers seemed tired and not that happy to be there, one walked into the room with an attitude and stayed that way throughout the whole time. Overall, it wasn't a very good experience and did not show off the company in a good light, (as far as software engineering department goes at least).

So far had two phone interviews. Both interviews were on the same day. First Interview: 1. General OOP questions. 2. Find nth last element in a single linked list. 3. pow(m,n). Asked to code this. Need to handle overflow cases. Second Interview: 1. Design question: Parking Lot 2. Find all non- duplicate pairs that sum to n.