I know you're joking but... If i had never heard of a binary tree, saw it for the first time in my interview, and didn't at least have an idea of how to attempt

I know you're joking but... If i had never heard of a binary tree, saw it for the first time in my interview, and didn't at least have an idea of how to attempt solving it, I'm probably a lousy hire. The quality of attempt is what these hard questions are really about.