I have some luck with a question that needs you to use a standard “interview” data structure in a slightly nonstandard way. People who can bring up the data str

I have some luck with a question that needs you to use a standard “interview” data structure in a slightly nonstandard way. People who can bring up the data structure and tell me all about it, but not see how to actually solve the problem with it, are easy to reject. People who can derive it on the spot, or at least figure out how to use it after I give it to them, tend to be impressive hires.