Microsoft Software Engineering interview questions

Met a representative at a career fair and later got a call that I had an on-campus interview with Microsoft. The interview was fairly straightforward: we started with a technical question and I was then asked to talk about the most challenging problem I had worked on. Was told that I'd hear back within 4-6 weeks but due to an error I didn't hear back within the time span and had to email them to inquire about my status. I was notified that I made it to the next round in Seattle. The interview in Seattle was 4 rounds and was straightforward. The interviewers were friendly and accommodating

Fair. The questions were relatively challenging but by no means impossible. The interviewers were your typical software engineer types. Most were friendly. I did well on three of the four interviews (I struggled with the first easy question because of a distraction). I got all the questions right though. I talked a lot about my approach and what I was considering in my solution. The wanted to know the run-times of my solutions.