Abstract
In this work, we consider the robust/soft-capacitated 2-level facility location problems. For the robust version, we propose a primal-dual based \((3+\epsilon )\)-approximation algorithm via construction of an adapted instance which explores some open facilities in the optimal solution. For the soft-capacitated version, we propose a \( (4+ 1/ (e-1) +\epsilon )\)-approximation algorithm via construction of the associated uncapacitated version whose connection cost is re-defined appropriately.





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Acknowledgements
The research of the first author is supported by Natural Science Foundation of China (No. 11501412) and Tianjin 131 innovative talent training project. The second author’s research is supported by Natural Science Foundation of China (No. 11371001). The third author’s research is supported by Higher Educational Science and Technology Program of Shandong Province (No. J15LN23). The fourth author’s research is supported by Natural Science Foundation of China (No. 61672323).
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Wu, C., Xu, D., Zhang, D. et al. Approximation algorithms for the robust/soft-capacitated 2-level facility location problems. J Glob Optim 70, 207–222 (2018). https://doi.org/10.1007/s10898-017-0566-1
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DOI: https://doi.org/10.1007/s10898-017-0566-1