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Audience

If you were trapped on a desert island and could have only one algorithms book, we recommend the complete box set of The Art of Computer Programming, Volumes 1–3, by Donald Knuth (1998). Knuth describes numerous data structures and algorithms and provides exquisite treatment and analysis. Complete with historical footnotes and exercises, these books could keep a programmer active and content for decades. It would certainly be challenging, however, to put directly into practice the ideas from Knuth's book.

But you are not trapped on a desert island, are you? No, you have sluggish code that must be improved by Friday and you need to understand how to do it!

We intend our book to be your primary reference when you are faced with an algorithmic question and need to either (a) solve a particular problem, or (b) improve on the performance of an existing solution. We cover a range of existing algorithms for solving a large number of problems and adhere to the following principles:

• When describing each algorithm, we use a stylized pattern to properly frame each discussion and explain the essential points of the algorithm. By using patterns, we create a readable book whose consistent presentation shows the impact that similar design decisions have on different algorithms.

• We use a variety of languages to describe the algorithms in the book (including C, C++, Java, and Ruby). In doing so, we make concrete the discussion on algorithms and speak using languages that you are already familiar with.

• We describe the expected performance of each algorithm and empirically provide evidence that supports these claims. Whether you trust in mathematics or in demonstrable execution times, you will be persuaded.

We intend this book to be most useful to software practitioners, programmers, and designers. To meet your objectives, you need access to a quality resource that explains real solutions to real algorithms that you need to solve real problems. You already know how to program in a variety of programming languages. You know about the essential computer science data structures, such as arrays, linked lists, stacks, queues, hash tables, binary trees, and undirected and directed graphs. You don't need to implement these data structures, since they are typically provided by code libraries.

We expect that you will use this book to learn about tried and tested solutions to solve problems efficiently. You will learn some advanced data structures and some novel ways to apply standard data structures to improve the efficiency of algorithms. Your problem-solving abilities will improve when you see the key decisions for each algorithm that make for efficient solutions.

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