Computer Science – Discrete Mathematics
Scientific paper
2010-06-17
Computer Science
Discrete Mathematics
27 pages, extended version of a conference paper which appeared in the Proceedings of the 16th Annual International Computing
Scientific paper
The rotor router model is a popular deterministic analogue of a random walk on a graph. Instead of moving to a random neighbor, the neighbors are served in a fixed order. We examine how fast this "deterministic random walk" covers all vertices (or all edges). We present general techniques to derive upper bounds for the vertex and edge cover time and derive matching lower bounds for several important graph classes. Depending on the topology, the deterministic random walk can be asymptotically faster, slower or equally fast as the classic random walk. We also examine the short term behavior of deterministic random walks, that is, the time to visit a fixed small number of vertices or edges.
Friedrich Tobias
Sauerwald Thomas
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