[svat]

I'm not sure I understand: the linked book is meant for high-school and college students, or anyone participating regularly in programming contests:

> The book is especially intended for students who want to learn algorithms and possibly participate in the International Olympiad in Informatics (IOI) or in the International Collegiate Programming Contest (ICPC). Of course, the book is also suitable for anybody else interested in competitive programming.

Anyone in the target audience of the book will encounter most of this frequently enough; I definitely didn't have the experience (when I was in college and doing competitive programming, over a decade ago) that I was forgetting most of it.

Of course, if someone is not interested in competitive programming and never uses any of the knowledge they're likely to eventually forget it; it's just like learning a bit of French or group theory (say) and not touching it again for years — it's possible to forget. But not sure why that's irritating; it's just the nature of learning, at least after a certain age or below a certain threshold of practice.

[badminton1]

Not the intended audience but now, technical interviews now have a lot of competitive programming in them so this book can help you.