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A Faster Tree-Decomposition Based Algorithm for Counting Linear Extensions

Authors Kustaa Kangas, Mikko Koivisto, Sami Salonen

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Author Details

Kustaa Kangas
  • Department of Computer Science, Aalto University, Espoo, Finland
Mikko Koivisto
  • Department of Computer Science, University of Helsinki, Helsinki, Finland
Sami Salonen
  • Department of Computer Science, University of Helsinki, Helsinki, Finland

Funding

This work was partially supported by the Academy of Finland, Grant 276864, "Supple Exponential Algorithms."

Cite AsGet BibTex

Kustaa Kangas, Mikko Koivisto, and Sami Salonen. A Faster Tree-Decomposition Based Algorithm for Counting Linear Extensions. In 13th International Symposium on Parameterized and Exact Computation (IPEC 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 115, pp. 5:1-5:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)
https://doi.org/10.4230/LIPIcs.IPEC.2018.5

Abstract

We consider the problem of counting the linear extensions of an n-element poset whose cover graph has treewidth at most t. We show that the problem can be solved in time O~(n^{t+3}), where O~ suppresses logarithmic factors. Our algorithm is based on fast multiplication of multivariate polynomials, and so differs radically from a previous O~(n^{t+4})-time inclusion - exclusion algorithm. We also investigate the algorithm from a practical point of view. We observe that the running time is not well characterized by the parameters n and t alone, fixing of which leaves large variance in running times due to uncontrolled features of the selected optimal-width tree decomposition. For selecting an efficient tree decomposition we adopt the method of empirical hardness models, and show that it typically enables picking a tree decomposition that is significantly more efficient than a random optimal-width tree decomposition.

Subject Classification

ACM Subject Classification
  • Theory of computation → Algorithm design techniques
  • Theory of computation → Parameterized complexity and exact algorithms
Keywords
  • Algorithm selection
  • empirical hardness
  • linear extension
  • multiplication of polynomials
  • tree decomposition

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