**Competitive Programming 4: Book 2** is an advanced learning resource for programmers who want to improve their algorithmic thinking and tackle challenging coding problems. Building on the fundamentals introduced in the first volume, this book explores a broader range of computer science topics commonly encountered in high-level programming contests and technical assessments. The material is aimed at university students, competitive programmers, educators, and self-learners seeking to strengthen their problem-solving abilities through practical examples and carefully selected exercises. It provides in-depth coverage of advanced algorithms, data structures, mathematical techniques, graph theory, dynamic programming, and other essential concepts used in modern programming competitions. Whether you are preparing for contests, enhancing your computer science knowledge, or sharpening your coding interview skills, this volume offers a structured approach to mastering advanced programming techniques and developing efficient solutions to complex computational problems.