Met them at a school fair, gave them my resume, and they contacted me for an online assessment (through Codility).

I did quite poorly on that, though, as I was at the very beginning of the interview process and hadn't had time to even review dynamic programming (and for some reason, many of the questions were that).

I guess look at Project Euler. One of the questions was from there (something with pieces of food that you have to collect, which I didn't have time to even think about).

I also felt that there wasn't enough time for the online test, but I believe it was just me being underprepared.

I also had an on-campus interview (which I thought went really well) where I talked about hash maps and then DFS/BFS in a BST.

Overall, easy enough to go to the on-site, but I wasn't able to...

So there was one question which was solved with a stack that I don't actually remember (calculate the time), one BST, one linked list that had loops and was represented as an array, and the collect rice from a chessboard problem.