> some DP algorithm you might not have used since college, and proving its correctness and run time to some stranger who may be barely out of college themselves

> some DP algorithm you might not have used since college, and proving its correctness and run time to some stranger who may be barely out of college themselves. I'm not opposed to white-boarding, but to reinforce this point I'll note that I would have done much better on some of these problems when I was just out of college than I would today, because they were all fresh in my mind. I assure you I wasn't a better programmer or employee then.