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The computational complexity of the parallel knock-out problem.

Broersma, H. and Johnson, M. and Paulusma, Daniel and Stewart, I. A. (2008) 'The computational complexity of the parallel knock-out problem.', Theoretical computer science., 393 (1-3). pp. 182-195.


We consider computational complexity questions related to parallel knock-out schemes for graphs. In such schemes, in each round, each remaining vertex of a given graph eliminates exactly one of its neighbours. We show that the problem of whether, for a given bipartite graph, such a scheme can be found that eliminates every vertex is NP-complete. Moreover, we show that, for all fixed positive integers k≥2, the problem of whether a given bipartite graph admits a scheme in which all vertices are eliminated in at most (exactly) k rounds is NP-complete. For graphs with bounded tree-width, however, both of these problems are shown to be solvable in polynomial time. We also show that r-regular graphs with r≥1, factor-critical graphs and 1-tough graphs admit a scheme in which all vertices are eliminated in one round.

Item Type:Article
Keywords:Parallel knock-out schemes, Computational complexity, NP-completeness, Bounded tree-width, Monadic second-order logic.
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Record Created:18 Jun 2008
Last Modified:02 Apr 2013 16:51

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