Amazon Software Intern interview questions

Applied for an internship at the Amazon Development Centre in London. Was sent an interesting technical test which I could complete in my own time - this was fairly simple but required some thought and I guess was also designed to test coding style etc. After sending the code via email, they gave me an onsite interview in which we discussed the company briefly and then went straight into a whiteboarding problem involving the game Go, with a free choice of programming language (I chose Java). I was quite nervous and this was my first experience of writing code on a whiteboard. I think they could see that I was not particularly confident in my solution (which I believe did work in the end), and that I took too long to progress.

Had 2 interviews of 45 minutes each. Both interviewers were nice and helpful. Since I had applied through my university it was a face to face interview. First question was to find the merging point of two lists which are in a Y shape. He asked me to give a rough solution and then optimize it. Second coding question was to find the intersection of two lists.