Inverse median problems

  • Authors:
  • Rainer E. Burkard;Carmen Pleschiutschnig;Jianzhong Zhang

  • Affiliations:
  • Institute of Optimization, Dynamical Systems and Discrete Mathematics, Graz University of Technology, Steyrergasse 30, A-8010 Graz, Austria;Institute of Optimization, Dynamical Systems and Discrete Mathematics, Graz University of Technology, Steyrergasse 30, A-8010 Graz, Austria;Department of Mathematics, City University of Hong Kong, Hong Kong

  • Venue:
  • Discrete Optimization
  • Year:
  • 2004

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Abstract

The inverse p-median problem consists in changing the weights of the customers of a p-median location problem at minimum cost such that a set of p prespecified suppliers becomes the p-median. The cost is proportional to the increase or decrease of the corresponding weight. We show that the discrete version of an inverse p-median problem can be formulated as a linear program. Therefore, it is polynomially solvable for fixed p even in the case of mixed positive and negative customer weights. In the case of trees with nonnegative vertex weights, the inverse 1-median problem is solvable in a greedy-like fashion. In the plane, the inverse 1-median problem can be solved in O(nlogn) time, provided the distances are measured in l"1- or l"~-norm, but this is not any more true in R^3 endowed with the Manhattan metric.