By Hang T. Lau

As a result of its portability and platform-independence, Java is the best laptop programming language to exploit whilst engaged on graph algorithms and different mathematical programming difficulties. accumulating the most renowned graph algorithms and optimization strategies, A Java Library of Graph Algorithms and Optimization offers the resource code for a library of Java courses that may be used to resolve difficulties in graph thought and combinatorial optimization. Self-contained and mostly self sufficient, every one subject begins with an issue description and an overview of the answer approach, by means of its parameter record specification, resource code, and a try out instance that illustrates using the code. The publication starts with a bankruptcy on random graph iteration that examines bipartite, standard, hooked up, Hamilton, and isomorphic graphs in addition to spanning, categorized, and unlabeled rooted bushes. It then discusses connectivity approaches, by way of a paths and cycles bankruptcy that includes the chinese language postman and touring salesman difficulties, Euler and Hamilton cycles, and shortest paths. the writer proceeds to explain try out methods regarding planarity and graph isomorphism. next chapters take care of graph coloring, graph matching, community movement, and packing and overlaying, together with the task, bottleneck project, quadratic task, a number of knapsack, set overlaying, and set partitioning difficulties. the ultimate chapters discover linear, integer, and quadratic programming. The appendices offer references that supply additional information of the algorithms and contain the definitions of many graph concept phrases utilized in the publication.

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**Example text**

The node i of the first random graph corresponds to the node perm[i] in the second graph. Procedure parameters: int randomIsomorphicGraphs (n, m, seed, simple, directed, firsti, firstj, secondi, secondj, map) randomIsomorphicGraph: int; exit: the method returns the following error code: 0: solution found with normal execution 1: value of m is too large, should be at most n∗(n−1)/2 for simple undirected graph, and n∗(n−1) for simple directed graph. n: int; entry: number of nodes of each graph. Nodes of each graph are labeled from 1 to n.

Nodei, nodej: int[m+1]; exit: the i-th edge is from node nodei[i] to node nodej[i], for i = 1,2,…,m. The Hamilton cycle is given by the first n elements of these two arrays. weight: int[m+1]; exit: weight[i] is the weight of the i-th edge, for i = 1,2,…,m; if weighted = false then this array is ignored. nextDouble() * (maxweight + 1 - minweight)); } } return 0; } Example: Generate a random simple Hamilton graph of 7 nodes and 10 edges with edge weights in the range of [90, 99]. 10 Random Maximum Flow Network The following procedure [JK91] generates a random simple weighted directed graph of n nodes in which node 1 (the source) has no incoming edges and node n (the sink) has no outgoing edges.

The k-th edge of the first graph is from node firsti[k] to node firstj[k], for k = 1,2,…,m. int[m+1]; the k-th edge of the second graph is from node secondi[k] to node secondj[k], for k = 1,2,…,m. int[n+1]; exit: in the graph isomorphism, node i of the first graph is renamed to node map[i] in the second graph, for i=1,2,…,n. = 0) return k; // generate a random permutation randomPermutation(n,ran,map); // rename the vertices to obtain the isomorphic graph for (int i=1; i<=m; i++) { secondi[i] = map[firsti[i]]; secondj[i] = map[firstj[i]]; } return k; } Example: Generate a pair of random isomorphic graphs with 5 nodes and 7 edges.