Robinhood Software Engineer(Internship) interview questions

Spoke with their engineers at our career fair and did an on-campus interview. A week later was contacted about an onsite, which as scheduled a week later. When I got there, there were ~10 other people waiting outside for on-sites that day. We went in, met with recruiters, got a quick tour of the office as well as a short, informal chat with the recruiter. There were 3 interviews, algorithms, algorithmic-coding, and coding, as they called them. First focused more on theory, second was theory with an implentation (which was expected to compile and run), and last was a HackerRank which I did as an engineer watched me and I discussed my thoughts (tests were expected to pass). In between interviews they were super curtious and showed me some parts of the office which I hadn't seen yet. At the end of the day there was a quick meeting with HR and that was it. The day started at 1pm so no lunch, though we were comped for meals that whole day.