A Faster Algorithm for Computing the Principal Sequence of Partitions of a Graph.
394 - 412.
We consider the following problem: given an undirected weighted graph G=(V,E,c) with nonnegative weights, minimize function c(delta(I ))-lambda|I | for all values of parameter lambda. Here I is a partition of the set of nodes, the first term is the cost of edges whose endpoints belong to different components of the partition, and |I | is the number of components. The current best known algorithm for this problem has complexity O(|V|(2)) maximum flow computations. We improve it to |V| parametric maximum flow computations. We observe that the complexity can be improved further for families of graphs which admit a good separator, e.g. for planar graphs.
|Title:||A Faster Algorithm for Computing the Principal Sequence of Partitions of a Graph|
|Keywords:||Principal sequence of partitions, Network attack, Network strength, Minimum cut/maximum flow, Parametric algorithm, PARAMETRIC MAXIMUM FLOW, NETWORK, REINFORCEMENT, POLYMATROIDS, STRENGTH, TREES|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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