Abstract
The Stop Number Minimization Problem arises in the management of a dial-a-ride system with small autonomous electric vehicles. In such a system, clients request for a ride from an origin point to a destination point, and a fleet of capacitated vehicles must satisfy all requests. The goal is to minimize the number of pick-up/drop-off operations. In [18], a special case was conjectured to be NP-Hard. In this paper we give a positive answer to this conjecture for any fixed capacity greater than or equal to 2. Moreover, we introduce a set of non-trivial instances that can be solved in polynomial time for capacity equal to 2, but is NP-Hard for higher capacities. We also present a new family of valid inequalities that are facet-defining for a large set of instances. Based on these inequalities, we derive a new efficient branch-and-cut algorithm.
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We want to thank the laboratory of excellence IMobS3 for its financial support.
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Baïou, M., Colares, R., Kerivin, H. (2018). The Stop Number Minimization Problem: Complexity and Polyhedral Analysis. In: Lee, J., Rinaldi, G., Mahjoub, A. (eds) Combinatorial Optimization. ISCO 2018. Lecture Notes in Computer Science(), vol 10856. Springer, Cham. https://doi.org/10.1007/978-3-319-96151-4_6
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