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Partitioning a graph into balanced connected classes: Formulations, separation and experiments

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  • Miyazawa, Flávio K.
  • Moura, Phablo F.S.
  • Ota, Matheus J.
  • Wakabayashi, Yoshiko

Abstract

This work addresses the balanced connectedk-partition problem (BCPk), which is formally defined as follows. Given a connected graph G=(V,E) with nonnegative weights on the vertices, find a partition {Vi}i=1k of V such that each class Vi induces a connected subgraph of G, and the weight of a class with the minimum weight is as large as possible. This problem, known to be NP-hard, has been largely investigated under different approaches and perspectives: exact algorithms, approximation algorithms for some values of k or special classes of graphs, and inapproximability results. On the practical side, BCPk is used to model many applications arising in image processing, cluster analysis, operating systems and robotics. We propose three linear programming formulations for BCPk. The first one contains only binary variables and a potentially large number of constraints that can be separated in polynomial time in the corresponding linear relaxation. We introduce new valid inequalities and design polynomial-time separation algorithms for them. The other two formulations are based on flows and have a polynomial number of constraints and variables. Our computational experiments show that the exact algorithms based on the proposed formulations outperform the other exact approaches presented in the literature.

Suggested Citation

  • Miyazawa, Flávio K. & Moura, Phablo F.S. & Ota, Matheus J. & Wakabayashi, Yoshiko, 2021. "Partitioning a graph into balanced connected classes: Formulations, separation and experiments," European Journal of Operational Research, Elsevier, vol. 293(3), pages 826-836.
    • Handle: RePEc:eee:ejores:v:293:y:2021:i:3:p:826-836
    DOI: 10.1016/j.ejor.2020.12.059
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    3. Guangting Chen & Yong Chen & Zhi-Zhong Chen & Guohui Lin & Tian Liu & An Zhang, 0. "Approximation algorithms for the maximally balanced connected graph tripartition problem," Journal of Combinatorial Optimization, Springer, vol. 0, pages 1-21.
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