[wutbrodo]

> Naturally if there is no option for the discussion when somebody does not know the answer off the top of their head then this would be really absurd and pointless situation.

Ah ok, I guess I misunderstood you. Though this "absurd and pointless situation" does in fact happen: There definitely is a class of interviewer who will expect off-the-top-of-your-head detailed knowledge (like being able to remember bubble sort's details from just its name).