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Deepening the (Parameterized) Complexity Analysis of Incremental Stable Matching Problems

Authors Niclas Boehmer, Klaus Heeger, Rolf Niedermeier

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Niclas Boehmer
  • Algorithmics and Computational Complexity, Faculty IV, TU Berlin, Germany
Klaus Heeger
  • Algorithmics and Computational Complexity, Faculty IV, TU Berlin, Germany
Rolf Niedermeier
  • Algorithmics and Computational Complexity, Faculty IV, TU Berlin, Germany

Acknowledgements

NB was supported by the DFG project MaMu (NI 369/19) and by the DFG project ComSoc-MPMS (NI 369/22). KH was supported by the DFG Research Training Group 2434 "Facets of Complexity" and by the DFG project FPTinP (NI 369/16).

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Niclas Boehmer, Klaus Heeger, and Rolf Niedermeier. Deepening the (Parameterized) Complexity Analysis of Incremental Stable Matching Problems. In 47th International Symposium on Mathematical Foundations of Computer Science (MFCS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 241, pp. 21:1-21:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)
https://doi.org/10.4230/LIPIcs.MFCS.2022.21

Abstract

When computing stable matchings, it is usually assumed that the preferences of the agents in the matching market are fixed. However, in many realistic scenarios, preferences change over time. Consequently, an initially stable matching may become unstable. Then, a natural goal is to find a matching which is stable with respect to the modified preferences and as close as possible to the initial one. For Stable Marriage/Roommates, this problem was formally defined as Incremental Stable Marriage/Roommates by Bredereck et al. [AAAI '20]. As they showed that Incremental Stable Roommates and Incremental Stable Marriage with Ties are NP-hard, we focus on the parameterized complexity of these problems. We answer two open questions of Bredereck et al. [AAAI '20]: We show that Incremental Stable Roommates is W[1]-hard parameterized by the number of changes in the preferences, yet admits an intricate XP-algorithm, and we show that Incremental Stable Marriage with Ties is W[1]-hard parameterized by the number of ties. Furthermore, we analyze the influence of the degree of "similarity" between the agents' preference lists, identifying several polynomial-time solvable and fixed-parameter tractable cases, but also proving that Incremental Stable Roommates and Incremental Stable Marriage with Ties parameterized by the number of different preference lists are W[1]-hard.

Subject Classification

ACM Subject Classification
  • Theory of computation → W hierarchy
  • Theory of computation → Fixed parameter tractability
  • Theory of computation → Design and analysis of algorithms
  • Theory of computation → Algorithmic game theory
Keywords
  • Stable Marriage
  • Stable Roommates
  • adapting to changing preferences
  • NP-hardness
  • W[1]-hardness
  • XP
  • FPT
  • master lists
  • incremental algorithms

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