Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Vertex cover might be hard to approximate to within 2-ε
Journal of Computer and System Sciences
FUN'07 Proceedings of the 4th international conference on Fun with algorithms
Algorithms and complexity of generalized river crossing problems
FUN'12 Proceedings of the 6th international conference on Fun with Algorithms
Transportation under nasty side constraints
MFCS'12 Proceedings of the 37th international conference on Mathematical Foundations of Computer Science
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We consider a planning problem that generalizes Alcuin's river crossing problem to scenarios with arbitrary conflict graphs. This generalization leads to the so-called Alcuin number of the underlying conflict graph. We derive a variety of combinatorial, structural, algorithmical, and complexity theoretical results around the Alcuin number. Our technical main result is an NP-certificate for the Alcuin number. It turns out that the Alcuin number of a graph is closely related to the size of a minimum vertex cover in the graph, and we unravel several surprising connections between these two graph parameters. We provide hardness results and a fixed parameter tractability result for computing the Alcuin number. Furthermore we demonstrate that the Alcuin number of chordal graphs, bipartite graphs, and planar graphs is substantially easier to analyze than the Alcuin number of general graphs.