Siemens Software Engineer interview questions

This was so horribly stressful. First interview was fine over phone no problem. Second was also fine phone interview with manager some basic questions easy. Then I had to interview 7 different times in one day took all day. Horribly stressful and exhausting and all the way from 7:30 am until 3pm I was answering things like "what does this code print out" looking at C++ code snippets. It was ridiculous. One guy asked me about quicksort and I had not studied complexity for this interview so I could not answer confidently and that was one of the only reasons I was not selected based on my feedback. The people were also as interesting as cardboard and many had accents difficult to understand which made everything more difficult when your already nervous.