An Introduction to the Analysis of Algorithms

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9780201400090: An Introduction to the Analysis of Algorithms

People who analyze algorithms have double happiness. First of all they experience the sheer beauty of elegant mathematical patterns that surround elegant computational procedures. Then they receive a practical payoff when their theories make it possible to get other jobs done more quickly and more economically.... The appearance of this long-awaited book is therefore most welcome. Its authors are not only worldwide leaders of the field, they also are masters of exposition. --D. E. Knuth This book provides a thorough introduction to the primary techniques used in the mathematical analysis of algorithms. The authors draw from classical mathematical material, including discrete mathematics, elementary real analysis, and combinatorics, as well as from classical computer science material, including algorithms and data structures. They focus on average-case or probabilistic analysis, although they also cover the basic mathematical tools required for worst-case or complexity analysis. Topics include recurrences, generating functions, asymptotics, trees, strings, maps, and an analysis of sorting, tree search, string search, and hashing algorithms. Despite the large interest in th

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From the Inside Flap:

This book is intended to be a thorough overview of the primary techniques used in the mathematical analysis of algorithms. The material covered draws from classical mathematical topics, including discrete mathematics, elementary real analysis, and combinatorics; as well as from classical computer science topics, including algorithms and data structures. The focus is on "average-case'' or "probabilistic'' analysis, though the basic mathematical tools required for "worst-case" or "complexity" analysis are covered, as well.

It is assumed that the reader has some familiarity with basic concepts in both computer science and real analysis. In a nutshell, the reader should be able to both write programs and prove theorems; otherwise, the book is intended to be self-contained. Ample references to preparatory material in the literature are also provided. A planned companion volume will cover more advanced techniques. Together, the books are intended to cover the main techniques and to provide access to the growing research literature on the analysis of algorithms.

The book is meant to be used as a textbook in a junior- or senior-level course on "Mathematical Analysis of Algorithms.'' It might also be useful in a course in discrete mathematics for computer scientists, since it covers basic techniques in discrete mathematics as well as combinatorics and basic properties of important discrete structures within a familiar context for computer science students. It is traditional to have somewhat broader coverage in such courses, but many instructors may find the approach here a useful way to engage students in a substantial portion of the material. The book also can be used to introduce students in mathematics and applied mathematics to principles from computer science related to algorithms and data structures.

Supplemented by papers from the literature, the book can serve as the basis for an introductory graduate course on the analysis of algorithms, or as a reference or basis for self-study by researchers in mathematics or computer science who want access to the literature in this field. It also might be of use to students and researchers in combinatorics and discrete mathematics, as a source of applications and techniques.

Despite the large literature on the mathematical analysis of algorithms, basic information on methods and models in widespread use has not been directly accessible to students and researchers in the field. This book aims to address this situation, bringing together a body of material intended to provide the reader with both an appreciation for the challenges of the field and the requisite background for learning the advanced tools being developed to meet these challenges.Preparation

Mathematical maturity equivalent to one or two years' study at the college level is assumed. Basic courses in combinatorics and discrete mathematics may provide useful background (and may overlap with some material in the book), as would courses in real analysis, numerical methods, or elementary number theory. We draw on all of these areas, but summarize the necessary material here, with reference to standard texts for people who want more information.

Programming experience equivalent to one or two semesters' study at the college level, including elementary data structures, is assumed. We do not dwell on programming and implementation issues, but algorithms and data structures are the central object of our studies. Again, our treatment is complete in the sense that we summarize basic information, with reference to standard texts and primary sources.

Access to a computer system for mathematical manipulation such as MAPLE or Mathematica is highly recommended. These systems can relieve one from tedious calculations, when checking material in the text or solving exercises.Related books

Related texts include "The Art of Computer Programming" by Knuth; "Handbook of Algorithms and Data Structure" by Gonnet and Baeza-Yates; "Algorithms"by Sedgewick; "Concrete Mathematics" by Graham, Knuth and Patashnik; and "Introduction to Algorithms" by Cormen, Leiserson, and Rivest. This book could be considered supplementary to each of these, as examined below, in turn.

In spirit, this book is closest to the pioneering books by Knuth, but our focus is on mathematical techniques of analysis, where those books are broad and encyclopaedic in scope with properties of algorithms playing a primary role and methods of analysis a secondary role. This book can serve as basic preparation for the advanced results covered and referred to in Knuth's books.

We also cover approaches and results in the analysis of algorithms that have been developed sincepublication of Knuth's books. The book by Gonnet and Baeza-Yates is a thorough survey of such results, including a comprehensive bibliography. That book primarily presents results with reference to derivations in the literature. Again, this book provides the basic preparation for access to this literature.

We also strive to keep the focus on covering algorithms of fundamental importance and interest, such as those described in Sedgewick, where Graham, Knuth, and Patashnik focus almost entirely on mathematical techniques. This book is intended to bea link between the basic mathematical techniques discussed in Knuth, Graham, and Patashnik and the basic algorithms covered in Sedgewick.

The book by Cormen, Leiserson, and Rivest is representative of a number of books that provide access to the research literature on "design and analysis'' of algorithms, which is normally based on rough worst-case estimates of performance. When more precise results are desired (presumably for the most important methods), more sophisticated models and mathematical tools are required. This book is supplementary to books like Cormen, Leiserson and Rivest in that they focus on design of algorithms (usually with the goal of bounding worst-case performance), with analytic results used to help guide the design, where we focus on the analysis of algorithms, especially on techniques that can be used to develop detailed results that could be used to predict performance. In this process, we also consider relationships to various classical mathematical tools. Chapter 1 is devoted entirely to developing this context.

This book also lays the groundwork for a companion volume, "Analytic Combinatorics", a general treatment that places the material in this book into a broader perspective and develops advanced methods and models that can serveas the basis for new research, not only in average-case analysis of algorithms, but also in combinatorics. A higher level of mathematical maturity is assumed for that volume, perhaps at the senior or beginning graduate student level. Of course, careful study of this book is adequate preparation. It certainly has been our goal to make the present volume sufficiently interesting that some readers will be inspired to tackle more advanced material! How to use this book

Readers of this book are likely to have rather diverse backgrounds in discrete mathematics and computer science. With this in mind, it is useful to be aware the basic structure of book: There are eight chapters, an introduction followed by three chapters that emphasize mathematical methods, then four chapters that emphasize applications in the analysis of algorithms, as shown in the following outline:IntroductionAnalysis of AlgorithmsDiscrete Mathematical MethodsRecurrencesGenerating FunctionsAsymptotic AnalysisAlgorithms and Combinatorial StructuresTreesPermutationsStrings and TriesWords and Maps

Chapter 1 puts the material in the book into perspective, and will help all readers understand the basic objectives of the book and the role of the remaining chapters in meeting those objectives. Chapters 2-4 are more oriented towards mathematics, as they cover methods from discrete mathematics, primarily focused on developing basic concepts and techniques. Chapters 5-8 are more oriented towards computer science, as they cover properties of combinatorial structures, their relationships to fundamental algorithms, and analytic results.

Though the book is intended to be self-contained, differences in emphasis are appropriate in teaching the material, depending on the background and experience of students and instructor. One approach, more mathematically oriented, would be to emphasize the theorems and proofs in the first part of the book, with applications drawn from Chapters 5-8. Another approach, more oriented towards computer science, would be to briefly cover the major mathematical tools in Chapters 2-4 and emphasize the algorithmic material in the second half of the book. But our primary intention is that most students should be able to learn new material from both mathematics and computer science in an interesting context by working carefully all the way through the book.

Students with a strong computer science background are likely to have seen many of the algorithms and data structures from the second half of the book but not much of the mathematical material at the beginning; students with a strong background in mathematics are likely to

About the Author:

Robert Sedgewick is the William O. Baker Professor of Computer Science at Princeton University. He is a Director of Adobe Systems and has served on the research staffs at Xerox PARC, IDA, and INRIA. He earned his Ph.D from Stanford University under Donald E. Knuth.

 

About Philippe Flajolet The late Philippe Flajolet was a Senior Research Director at INRIA, Rocquencourt, where he created and led the ALGO research group, attracting visiting researchers from all over the world. He is celebrated for having opened new lines of research in the analysis of algorithms, having developed powerful new methods, and having solved difficult, open problems. Dr. Flajolet taught at Ecole Polytechnique and Princeton University; he also held visiting positions at Waterloo University, Stanford University, the University of Chile, the Technical  University of Vienna, IBM, and Bell Laboratories. He received several prizes, including the Grand Science Prize of UAP (1986), the Computer Science Prize of the French Academy of Sciences (1994), and the Silver Medal of CNRS (2004). He was elected a Member of the Academia Europaea in 1995 and a Member (Fellow) of the French Academy of Sciences in 2003.

 

Phillipe passed away suddenly and unexpectedly a few months ago.


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