The Complexity of König Subgraph Problems and Above‐Guarantee Vertex Cover

The Complexity of König Subgraph Problems and Above‐Guarantee Vertex Cover

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Article ID: iaor201110811
Volume: 61
Issue: 4
Start Page Number: 857
End Page Number: 881
Publication Date: Dec 2011
Journal: Algorithmica
Authors: , , , ,
Keywords: analysis of algorithms, complexity, graphical methods, NP-complete, vertex cover
Abstract:

A graph is König‐Egerváry if the size of a minimum vertex cover equals that of a maximum matching in the graph. These graphs have been studied extensively from a graph‐theoretic point of view. In this paper, we introduce and study the algorithmic complexity of finding König‐Egerváry subgraphs of a given graph. In particular, given a graph G and a nonnegative integer k, we are interested in the following questions:

  • does there exist a set of k vertices (edges) whose deletion makes the graph König‐Egerváry?
  • does there exist a set of k vertices (edges) that induce a König‐Egerváry subgraph?
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