However, it's a huge waste of time when so many of the questions are the same. I get it, every company wants to know if I can turn a list into a balanced BST, it's not an unfair question, it's not particularly hard, but I really get annoyed I have to keep solving it over and over.
I really wish there was some certifying body that would put me through the whiteboard guantlet once, and then I could just share my score to companies I apply to.