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The Hamiltonian p-median problem: Polyhedral results and branch-and-cut algorithms

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  • Barbato, Michele
  • Gouveia, Luís

Abstract

In this paper we study the Hamiltonian p-median problem, in which we are given an edge-weighted graph and we are asked to determine p vertex-disjoint cycles spanning all vertices of the graph and having minimum total weight. We introduce two new families of valid inequalities for a formulation of the problem in the space of edge variables. Each one of the families forbids solutions to the 2-factor relaxation of the problem that have less than p cycles. The inequalities in one of the families are associated with large cycles of the underlying graph and generalize known inequalities associated with Hamiltonian cycles. The other family involves inequalities for the case with p=n/3, associated with edge cuts and multi-cuts whose shores have specific cardinalities. We identify inequalities from both families that define facets of the polytope associated with the problem. We design branch-and-cut algorithms based on these families of inequalities and on inequalities associated with 2-opt moves removing sub-optimal solutions. Computational experiments on benchmark instances show that the proposed algorithms exhibit a comparable performance with respect to existing exact methods from the literature. Moreover the algorithms solve to optimality new instances with up to 400 vertices.

Suggested Citation

  • Barbato, Michele & Gouveia, Luís, 2024. "The Hamiltonian p-median problem: Polyhedral results and branch-and-cut algorithms," European Journal of Operational Research, Elsevier, vol. 316(2), pages 473-487.
  • Handle: RePEc:eee:ejores:v:316:y:2024:i:2:p:473-487
    DOI: 10.1016/j.ejor.2024.02.032
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    References listed on IDEAS

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    2. Branco, I. M. & Coelho, J. D., 1990. "The hamiltonian p-median problem," European Journal of Operational Research, Elsevier, vol. 47(1), pages 86-95, July.
    3. Ahmed M. Marzouk & Erick Moreno-Centeno & Halit Üster, 2016. "A Branch-and-Price Algorithm for Solving the Hamiltonian p -Median Problem," INFORMS Journal on Computing, INFORMS, vol. 28(4), pages 674-686, November.
    4. Erdoğan, Güneş & Laporte, Gilbert & Rodríguez Chía, Antonio M., 2016. "Exact and heuristic algorithms for the Hamiltonian p-median problem," European Journal of Operational Research, Elsevier, vol. 253(2), pages 280-289.
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