Connected Software Engineer interview questions

Applied online and was sent an online test: 3 algorithm questions. Got a response after 3 weeks. I was invited on-site. Interview was with 2 very young developers. One was nice and friendly, the other one condescending and unfriendly. I was asked to provide my answers on a white board. I didn't find the coding question fair.

I get an online test after applying for it. Which is not difficult, but the question looks a little unclear. Search an element in binary search tree is the first problem. The second one is given an cinema queueing system, calculate when the customer can finish buying several tickets.