Solutions include code snippets which are primarily in C++. Programs concerned with concurrency are in Java. Complete programs are available at epibook.github.io. Java versions of the C++ programs in the book can be found at the website.
Since different candidates have different time constraints, EPI includes a study guide with several scenarios, ranging from weekend Hackathon to semester long preparation with a recommended a subset of problems for each scenario.
All problems are classified in terms of their difficulty level and include many variants to help you apply what you have learned more widely.
All problems includes hints for readers who get stuck. This simulates what you will face in the real interview.