Abstract
In this article, we investigate the dynamic (multi-period) facility location problem with potentially unserved clients or outliers. We propose a 3-approximation primal-dual algorithm based on an integer linear program formulation of the problem. We further improve the approximation ratio to 2 by combining the cost scaling and greedy improvement techniques.

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Acknowledgements
The research of the second author is supported by NSFC (No. 11531014). The third author’s research is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Grant 283106.
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This paper has been presented in the 10th International Conference on Optimization Techniques and Applications (ICOTA 10).
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Jiang, Y., Xu, D., Du, D. et al. An approximation algorithm for the dynamic facility location problem with outliers. Optim Lett 13, 561–571 (2019). https://doi.org/10.1007/s11590-017-1153-6
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DOI: https://doi.org/10.1007/s11590-017-1153-6