written by Antti Laaksonen
|Competitive Programmer's Handbook is a free online book whose purpose is to give the reader a thorough introduction to competitive programming. You can download the book here (PDF) and view the project on GitHub.|
|Guide to Competitive Programming is a printed book, published by Springer. It is based on Competitive Programmer's Handbook, but also discusses more advanced topics. You can buy the book, for example, through Springer or Amazon.|
|Олимпиадное программирование (Olympiad Programming) is a Russian version of Guide to Competitive Programming, published by DMK Press. You can find more information about the book on their website.|
Do you want to practice competitive programming? The CSES Problem Set contains a collection of practice problems, ranging from easy to difficult.