I had four interviews plus one lunch chat on site.

Each of the interviews was one-on-one.

They asked me programming questions and some language-specific syntax questions.

All of the interviewers brought their laptops and tried to run my code while I was writing it on a whiteboard. It was my first official on-site interview, so I was a little bit nervous. Though I didn't get the offer, the experience was still very helpful.

Write a calendar system that can show scheduled meetings (from - to) and attendees. Sort the meetings according to some rules (e.g., starting time in ascending order). Find out how many meetings are overlapped.