It was a test, 4 programming questions, each one on a different topic, the first one had to do with binary trees, there was one with a hash table, another to fix different bugs, and another one that I don't remember.

You had to answer all of them to get to someone to even talk to you or look at you. It is very unpersonal and in my opinion doesn't really check what the candidates are really capable of. If you do not read the question in a forum before, there is almost no chance to answer all the questions correctly in the amount of time you get.

I don't remember, but there are a lot of different internet sites that have them.