Can interviewers solve their own problems?
I wonder during the 5 round on-sites, can all 5 interviewers solve all 5 questions that were given to the candidates? Assuming they haven't seen the question before.
I find some of these questions given unforgiving, that you have to have seen them before you can even attempt it. And I sometimes wonder if the interviewers themselves would even be able to solve them.
It's like that one story where the HC at Google declined 5 candidates and found out those candidates were their results a few years ago.