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K-Best Solutions of MSO Problems on Tree-Decomposable Graphs

Authors David Eppstein, Denis Kurz

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David Eppstein
Denis Kurz

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David Eppstein and Denis Kurz. K-Best Solutions of MSO Problems on Tree-Decomposable Graphs. In 12th International Symposium on Parameterized and Exact Computation (IPEC 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 89, pp. 16:1-16:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)
https://doi.org/10.4230/LIPIcs.IPEC.2017.16

Abstract

We show that, for any graph optimization problem in which the feasible solutions can be expressed by a formula in monadic second-order logic describing sets of vertices or edges and in which the goal is to minimize the sum of the weights in the selected sets, we can find the k best solution values for n-vertex graphs of bounded treewidth in time O(n + k log n). In particular, this applies to finding the k shortest simple paths between given vertices in directed graphs of bounded treewidth, giving an exponential speedup in the per-path cost over previous algorithms.
Keywords
  • graph algorithm
  • k-best
  • monadic second-order logic
  • treewidth

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