NVIDIA Software Engineer interview questions

It's a campus interview at our university's engineering and computer science career fair. You are given four questions and two of them are related to hardware and operation system. The other two are code design using C++. However, you only need to answer one of them. The second one is for bonus. Not difficult in general.

I applied online and then was contacted by HR asking for interview dates and time. Phone Interview was scheduled 2 weeks later. Interviewer was friendly and all technical questions were asked.