Abstract
In this paper, we study the complexity and the approximation of the k most vital edges (nodes) and min edge (node) blocker versions for the minimum spanning tree problem (MST). We show that the k most vital edges MST problem is NP-hard even for complete graphs with weights 0 or 1 and 3-approximable for graphs with weights 0 or 1. We also prove that the k most vital nodes MST problem is not approximable within a factor n 1−ϵ, for any ϵ>0, unless NP=ZPP, even for complete graphs of order n with weights 0 or 1. Furthermore, we show that the min edge blocker MST problem is NP-hard even for complete graphs with weights 0 or 1 and that the min node blocker MST problem is NP-hard to approximate within a factor 1.36 even for graphs with weights 0 or 1.



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Bazgan, C., Toubaline, S. & Vanderpooten, D. Critical edges/nodes for the minimum spanning tree problem: complexity and approximation. J Comb Optim 26, 178–189 (2013). https://doi.org/10.1007/s10878-011-9449-4
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DOI: https://doi.org/10.1007/s10878-011-9449-4