By Gabriel Valiente

ISBN-10: 3642078095

ISBN-13: 9783642078095

ISBN-10: 366204921X

ISBN-13: 9783662049211

Graph algorithms is a well-established topic in arithmetic and machine technological know-how. past classical software fields, like approximation, combinatorial optimization, images, and operations examine, graph algorithms have lately attracted elevated recognition from computational molecular biology and computational chemistry. situated round the basic factor of graph isomorphism, this article is going past classical graph difficulties of shortest paths, spanning bushes, flows in networks, and matchings in bipartite graphs. complicated algorithmic effects and strategies of useful relevance are awarded in a coherent and consolidated method. This ebook introduces graph algorithms on an intuitive foundation by way of an in depth exposition in a literate programming variety, with correctness proofs in addition to worst-case analyses. additionally, complete C++ implementations of all algorithms provided are given utilizing the LEDA library of effective info buildings and algorithms. a variety of illustrations, examples, and routines, and a complete bibliography aid scholars and pros in utilizing the ebook as a textual content and resource of reference

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3 Implementation Correctness The main goal of literate programming is producing programs that are easy to understand and maintain, and literate programming can be argued to help producing more robust and reliable programs. Exposing actual program code, though, also opens up the possibility to include result checking within the program code itself. A program correctness checker is an algorithm that, given a program and a problem instance on which the program is executed, certifies whether the output of the program on that particular problem instance is correct.

Bibliographic Notes A more detailed exposition of the graph-theoretical notions reviewed in this chapter can be found in [23, 37,49, 50, 63, 68, 139, 152, 175, 253,269, 330]. Ordered or embedded graphs are the subject of topological graph theory. See, for instance, [249, 138, 365], and also [236, Chap. 8]. General references to algorithms and data structures include [2, 31, 83, 193, 194, 195, 290, 363], and further references to combinatorial and graph algorithms include [69, 78, 107, 127, 130, 203,232,236,229,255,271,304,321,336,367].

52. Exception handling is a standard mechanism to report error conditions. Depending on the particular application, though, some alternative approach may be more appropriate, and some corrective action may even be undertaken upon detecting an error. 30 1. Introduction Every decidable problem admits a correctness checker, although polynomial-time result checking algorithms for intractable problems are neither known nor believed to exist. Nevertheless, result checking of some intractable problems becomes tractable with the help of additional information in the form of correctness certificates, also called certification trails.

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