Cracking the Coding Interview

With 150 questions, I'm curious how Gayle Laakmann McDowell chose the ones that best reflect real interview challenges. Were these based on her experiences, or did she analyze common patterns across companies?

Some explanations clicked perfectly, but others left me confused. Am I the only one who wishes there were more step-by-step walkthroughs or visual aids?

The format makes it easy to test oneself, but I'm curious whether this approach was based on proven study methods or personal preference from the author.