I feel like jkingsbery's comment[1] is relevant here:
> One of the interviewer asked me to recite the algorithm for constructing a Convex Hull.
> ...
> we struggled together for an hour, with him frustrated that I couldn't remember the details of an algorithm I last had seen 6 years earlier and couldn't recite in 60 minutes what took our professor 180 minutes of lectures to cover, and me frustrated that would have taken me 30 seconds to look up.
> One of the interviewer asked me to recite the algorithm for constructing a Convex Hull. > ... > we struggled together for an hour, with him frustrated that I couldn't remember the details of an algorithm I last had seen 6 years earlier and couldn't recite in 60 minutes what took our professor 180 minutes of lectures to cover, and me frustrated that would have taken me 30 seconds to look up.
[1] https://news.ycombinator.com/item?id=23847814