New PDF release: Algorithms in C, Part 5: Graph Algorithms

By Robert Sedgewick

ISBN-10: 0201316633

ISBN-13: 9780201316636

Graph algorithms are serious for a number of functions, reminiscent of community connectivity, circuit layout, scheduling, transaction processing, and source allocation. This paintings offers many algorithms and their factors. additionally it is specific figures, with accompanying statement.

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Additional resources for Algorithms in C, Part 5: Graph Algorithms

Example text

For example, for a given problem, we might develop 2 one algorithm that takes about V steps and another that takes about E lg E steps. These formulas tell us that the second algorithm would be better for sparse graphs, whereas the first would be preferred for dense graphs. For example, a dense graph with millions of 2 edges might have only thousands of vertices: in this case V and E would be comparable 2 in value, and the V algorithm would be 20 times faster than the E lg E algorithm. On the other hand, a sparse graph with millions of edges also has millions of vertices, so the E lg 2 E algorithm could be millions of times faster than the V algorithm.

In Chapter 22, we do consider implementations of a similar structure that plays an essential role in the powerful general algorithms that we consider in that chapter. For clarity in describing and developing implementations of algorithms of interest, we use the simplest appropriate representation. Generally, we strive to make a link or an auxiliary array in a piece of code directly relevant to the task at hand. Many programmers practice this kind of minimalism as a matter of course, knowing that maintaining the integrity of a data structure with multiple disparate components can be a challenging task, indeed.

6. 6). 6). Note: Remember the possibility of duplicates. 6). 6. 10? 6 that keeps the adjacency lists in sorted order of vertex index. Describe a situation where this approach would be useful. 1) that removes self-loops and parallel edges. 6) that uses time proportional to E and extra space proportional to V. 33 to also remove degree-0 (isolated) vertices. Note: To remove vertices, you need to rename the other vertices and rebuild the data structures—you should do so just once. 6) that collapses paths that consist solely of degree-2 vertices.

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Algorithms in C, Part 5: Graph Algorithms by Robert Sedgewick


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