I am sorry -- since Gayle's book of the same name is a product worth ~$30, I assumed there was a paywall at some point behind https://www.hackerrank.com/domains/tutorials/cracking-the-co... -- I guess I was wrong? It doesn't clearly say on the page that it was, and I don't want to sign up for their product.

A slightly weaker version of that argument is that having a vast base of signed-up users and data about their challenges is still making bank out of the efforts of individual users, but clearly not as bad as requiring you to pay for this tutorial.

They make money by selling the snake oil that are these tests and interviews. They need interviewers to believe they are useful and diagnostic, and they need interviewees to put up with them and think it's acceptable to be put through it.

Had a look myself. There isn't.