Tabu Search
An alternating heuristic for medianoid and centroid problems in the plane
Computers and Operations Research
A feasibility pump heuristic for general mixed-integer problems
Discrete Optimization
Particle swarm optimization with two swarms for the discrete (r|p)-centroid problem
EUROCAST'11 Proceedings of the 13th international conference on Computer Aided Systems Theory - Volume Part I
Local search algorithms for the problem of competitive location of enterprises
Automation and Remote Control
Branch-and-bound algorithm for a competitive facility location problem
Computers and Operations Research
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In the discrete (r |p)-centroid problem two decision makers, a leader and a follower, compete to attract clients from a given market. The leader opens p facilities, anticipating that the follower will react to the decision by opening his own r facilities. The decision makers try to maximize their own profits. This Stackelberg game is $\Sigma_2^P$-hard. So, we develop a hybrid memetic algorithm for it. A probabilistic tabu search heuristic is applied for improving the offspring. To obtain an upper bound, we reformulate the problem as a mixed integer program with an exponential number of constraints and variables. Selecting some of them, we get the desired upper bound. To find optimal solutions, we iteratively modify the subset of the constraints and variables. This approach is tested on the benchmarks from the library Discrete Location Problems. The optimal solutions are found for r=p=5, 100 clients, and 100 facilities.