I was not prepared when I had my last interview like this, but if I ever go interviewing again I'll make sure to have my own algorithmic problem at hand (to whi

I was not prepared when I had my last interview like this, but if I ever go interviewing again I'll make sure to have my own algorithmic problem at hand (to which I'd know by heart all the tricks and improvements). Then at the end of the interview I'll ask the interviewers to solve the problem (or just give a description of how it would work). Point being - if they interview you on this stuff but can't do it themselves without knowing the solutions before, then how could they reasonably claim to be assessing you? And would you want to work for someone who does this to potential employees? It sometimes seems like these interviews are dk measuring contests between the two parties.