Amazon Software Development Engineer II interview questions

Amazon found me on linkedin, gave me a programming test (I had 60 minutes to complete that) where they asked about algorithmic correctness and also complexity, and finally invited me to face-to-face interview in a hotel nearby. The face-to-face interview was four-round interview, each round there was someone different asking different questions and doing lot of notes. Everyone was smiling so I felt like everything is fine, I am doing well etc, but as it turned out, it is not the case.