The evolution of computer science has elevated algorithm design as a cornerstone of problem-solving in both academic research and industry practice. As the complexity of computational challenges continues to grow, mastering algorithmic thinking has become essential for anyone pursuing a career in technology or aiming for academic excellence. The aim of this book, Introduction to Algorithm Design: Previous Years Unsolved Papers, is to provide learners with a platform to enhance their analytical and problem-solving capabilities through a curated selection of unsolved questions from previous years' examinations.This book emphasizes a hands-on approach, inviting readers to engage directly with intricate problems spanning core algorithmic topics such as sorting, searching, dynamic programming, graph theory, and more. By grappling with these questions, learners develop deeper insights into algorithm efficiency, optimization, and application.We have designed this book to serve both undergraduate students seeking a deeper understanding of algorithms and professionals preparing for competitive exams or technical interviews. Each problem has been carefully selected to represent a diverse range of difficulty levels, offering a comprehensive challenge for learners at any stage.We hope this book becomes an invaluable tool in your journey towards mastering algorithm design and encourages you to approach complex computational problems with confidence and precision.