Ask a lot about data structure and algorithm, questions are classical, 2sum, find head of cycling linked list, given access to middle node of a linked list and asked to be delete it. And OOD design a elevator system, and some SQL query, basically same as before, but I suggest you guys prepare for a SQL query that return the top node in a hierarchy structure, for example return the manager of the manager of the manager....until the boss, I am still not sure about that. And multithread concept and ATM question, producer/consumer question.
