Amazon Software Development Engineer interview questions

I was selected for a phone interview, scheduled time away from my current job to fulfill a one hour time slot away from the office I drove to work 45 minutes away instead of busing so that I could leave for the interview mid-day. After 15 minutes of waiting for the call at a Starbucks, I emailed the person who scheduled the interview about the delay. an additional 30 minutes later, I called her and was informed that there was a last minute reason they had to postpone the interview and I would hear from them later that week. Despite my attempts to follow up, I never heard from them again. I can understand not being selected, but I can't understand that they wouldn't let me know early enough for me to avoid wasting so much time.

I sent my resume to a campus recruiter and received a group interview invitation a month later. Had an one-hour long campus tour in the beginning and the interview took up the rest of the day. Each group has three members, each works on one part of the problem and you need to figure out division of tasks. Each task is independent and you can choose you language.