Smart Quicksort: adaptive algorithm for sorting geometric data PDF Download
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Author: David Podgorelec
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
In the report, we propose a combination of quicksort and a new sorting algorithm, which shows excellent time performance in sorting sorted arrays and nearly sorted arrays consisting of a low number of monotone subarrays, no matter whether presortedness appears in desired or in reverse order. Besides this, the proposed combination is not much slower than quicksort in random case. Our work was inspired by the problems met during sorting polygon vertices in sweep-line algorithms of computational geometry, and therefore, we name the new algorithm vertex sort. It splits input array into three subarrays. Two of them are sorted already, and the third one is handled iteratively. A simple test decides whether to continue recursively with vertexsort or to employ quicksort in the second iteration. In this way, we achieve that the worst case time complexity does not exceed running times of quicksort, but the simplest case s are handled in linear time. Because ofthis desired property, we name the combined algorithm smart quicksort. We approve its efficiency by employing it in the well-known sweep-line based polygon triangulation algorithm. In the last part of the report, we introduce some ideas that should improve the algorithm in near future. A nonrecursive versionis proposed among all.
Author: David Podgorelec
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
In the report, we propose a combination of quicksort and a new sorting algorithm, which shows excellent time performance in sorting sorted arrays and nearly sorted arrays consisting of a low number of monotone subarrays, no matter whether presortedness appears in desired or in reverse order. Besides this, the proposed combination is not much slower than quicksort in random case. Our work was inspired by the problems met during sorting polygon vertices in sweep-line algorithms of computational geometry, and therefore, we name the new algorithm vertex sort. It splits input array into three subarrays. Two of them are sorted already, and the third one is handled iteratively. A simple test decides whether to continue recursively with vertexsort or to employ quicksort in the second iteration. In this way, we achieve that the worst case time complexity does not exceed running times of quicksort, but the simplest case s are handled in linear time. Because ofthis desired property, we name the combined algorithm smart quicksort. We approve its efficiency by employing it in the well-known sweep-line based polygon triangulation algorithm. In the last part of the report, we introduce some ideas that should improve the algorithm in near future. A nonrecursive versionis proposed among all.
Author: David Podgorelec
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
Author: Clifford A. Shaffer
Publisher:
ISBN:
Category : Computers
Languages : en
Pages : 536
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Book Description
This practical text contains fairly "traditional" coverage of data structures with a clear and complete use of algorithm analysis, and some emphasis on file processing techniques as relevant to modern programmers. It fully integrates OO programming with these topics, as part of the detailed presentation of OO programming itself.Chapter topics include lists, stacks, and queues; binary and general trees; graphs; file processing and external sorting; searching; indexing; and limits to computation.For programmers who need a good reference on data structures.
Author: Clifford A. Shaffer
Publisher: Courier Corporation
ISBN: 0486173569
Category : Computers
Languages : en
Pages : 607
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Book Description
Comprehensive treatment focuses on creation of efficient data structures and algorithms and selection or design of data structure best suited to specific problems. This edition uses Java as the programming language.
Author: George T. Heineman
Publisher: "O'Reilly Media, Inc."
ISBN: 1449391133
Category : Computers
Languages : en
Pages : 366
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Book Description
Creating robust software requires the use of efficient algorithms, but programmers seldom think about them until a problem occurs. Algorithms in a Nutshell describes a large number of existing algorithms for solving a variety of problems, and helps you select and implement the right algorithm for your needs -- with just enough math to let you understand and analyze algorithm performance. With its focus on application, rather than theory, this book provides efficient code solutions in several programming languages that you can easily adapt to a specific project. Each major algorithm is presented in the style of a design pattern that includes information to help you understand why and when the algorithm is appropriate. With this book, you will: Solve a particular coding problem or improve on the performance of an existing solution Quickly locate algorithms that relate to the problems you want to solve, and determine why a particular algorithm is the right one to use Get algorithmic solutions in C, C++, Java, and Ruby with implementation tips Learn the expected performance of an algorithm, and the conditions it needs to perform at its best Discover the impact that similar design decisions have on different algorithms Learn advanced data structures to improve the efficiency of algorithms With Algorithms in a Nutshell, you'll learn how to improve the performance of key algorithms essential for the success of your software applications.
Author: Mark Allen Weiss
Publisher:
ISBN: 9780321189967
Category : C++ (Computer program language)
Languages : en
Pages : 588
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Book Description
In this second edition of his successful book, experienced teacher and author Mark Allen Weiss continues to refine and enhance his innovative approach to algorithms and data structures. Written for the advanced data structures course, this text highlights theoretical topics such as abstract data types and the efficiency of algorithms, as well as performance and running time. Before covering algorithms and data structures, the author provides a brief introduction to C++ for programmers unfamiliar with the language. Dr Weiss's clear writing style, logical organization of topics, and extensive use of figures and examples to demonstrate the successive stages of an algorithm make this an accessible, valuable text. New to this Edition *An appendix on the Standard Template Library (STL) *C++ code, tested on multiple platforms, that conforms to the ANSI ISO final draft standard 0201361221B04062001
Author: John L. Hennessy
Publisher: Elsevier
ISBN: 0080475027
Category : Computers
Languages : en
Pages : 705
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Book Description
The era of seemingly unlimited growth in processor performance is over: single chip architectures can no longer overcome the performance limitations imposed by the power they consume and the heat they generate. Today, Intel and other semiconductor firms are abandoning the single fast processor model in favor of multi-core microprocessors--chips that combine two or more processors in a single package. In the fourth edition of Computer Architecture, the authors focus on this historic shift, increasing their coverage of multiprocessors and exploring the most effective ways of achieving parallelism as the key to unlocking the power of multiple processor architectures. Additionally, the new edition has expanded and updated coverage of design topics beyond processor performance, including power, reliability, availability, and dependability. CD System Requirements PDF Viewer The CD material includes PDF documents that you can read with a PDF viewer such as Adobe, Acrobat or Adobe Reader. Recent versions of Adobe Reader for some platforms are included on the CD. HTML Browser The navigation framework on this CD is delivered in HTML and JavaScript. It is recommended that you install the latest version of your favorite HTML browser to view this CD. The content has been verified under Windows XP with the following browsers: Internet Explorer 6.0, Firefox 1.5; under Mac OS X (Panther) with the following browsers: Internet Explorer 5.2, Firefox 1.0.6, Safari 1.3; and under Mandriva Linux 2006 with the following browsers: Firefox 1.0.6, Konqueror 3.4.2, Mozilla 1.7.11. The content is designed to be viewed in a browser window that is at least 720 pixels wide. You may find the content does not display well if your display is not set to at least 1024x768 pixel resolution. Operating System This CD can be used under any operating system that includes an HTML browser and a PDF viewer. This includes Windows, Mac OS, and most Linux and Unix systems. Increased coverage on achieving parallelism with multiprocessors. Case studies of latest technology from industry including the Sun Niagara Multiprocessor, AMD Opteron, and Pentium 4. Three review appendices, included in the printed volume, review the basic and intermediate principles the main text relies upon. Eight reference appendices, collected on the CD, cover a range of topics including specific architectures, embedded systems, application specific processors--some guest authored by subject experts.
Author: Clifford A. Shaffer
Publisher: Courier Corporation
ISBN: 0486172627
Category : Computers
Languages : en
Pages : 626
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Book Description
Comprehensive treatment focuses on creation of efficient data structures and algorithms and selection or design of data structure best suited to specific problems. This edition uses C++ as the programming language.
Author: Robert Sedgewick
Publisher: Addison-Wesley Professional
ISBN: 9780768682335
Category : Algorithms
Languages : en
Pages : 0
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Book Description
Algorithms in C is a comprehensive repository of algorithms, complete with code. If you're in a pinch and need to code something up fast, this book is the place to look. Starting with basic data structures, Algorithms in C covers an enormous scope of information, with extensive treatment of searching and advanced data structures, sorting, string processing, computational geometry, graph problems, and mathematical algorithms. Although the manual often neglects to provide rigorous analysis, the text surrounding the algorithms provides clear and relevant insight into why the algorithms work.
Author: Goetz Graefe
Publisher: Now Publishers Inc
ISBN: 1601984820
Category : Computers
Languages : en
Pages : 216
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Book Description
Invented about 40 years ago and called ubiquitous less than 10 years later, B-tree indexes have been used in a wide variety of computing systems from handheld devices to mainframes and server farms. Over the years, many techniques have been added to the basic design in order to improve efficiency or to add functionality. Examples include separation of updates to structure or contents, utility operations such as non-logged yet transactional index creation, and robust query processing such as graceful degradation during index-to-index navigation. Modern B-Tree Techniques reviews the basics of B-trees and of B-tree indexes in databases, transactional techniques and query processing techniques related to B-trees, B-tree utilities essential for database operations, and many optimizations and improvements. It is intended both as a tutorial and as a reference, enabling researchers to compare index innovations with advanced B-tree techniques and enabling professionals to select features, functions, and tradeoffs most appropriate for their data management challenges.
