کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
436400 | 689998 | 2014 | 5 صفحه PDF | دانلود رایگان |
• We propose the minimum weight connected k -subgraph cover problem (MWVCCkMWVCCk).
• We give a (k−1k−1)-approximation for MWVCCkMWVCCk when the girth is at least k.
• An example is given showing that the analysis of our algorithm is tight.
A subset F of vertices is called a connected k -subgraph cover (VCCkVCCk) if every connected subgraph on k vertices contains at least one vertex from F. The minimum weight connected k -subgraph cover problem (MWVCCkMWVCCk) has its background in the field of security and supervisory control. It is a generalization of the minimum weight vertex cover problem, and is related with the minimum weight k -path cover problem (MWVCPkMWVCPk) which requires that every path on k vertices has at least one vertex from F. A k-approximation algorithm can be easily obtained by LP rounding method. Assuming that the girth of the graph is at least k , we reduce the approximation ratio to k−1k−1, which is tight for our algorithm.
Journal: Theoretical Computer Science - Volume 535, 22 May 2014, Pages 54–58