# An exponential time 2-approximation algorithm for bandwidth [electronic resource].

- Published:
- Washington, D.C. : United States. Dept. of Energy, 2009.

Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Additional Creators:
- Los Alamos National Laboratory

United States. Department of Energy

United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov

- Summary:
- The bandwidth of a graph G on n vertices is the minimum b such that the vertices of G can be labeled from 1 to n such that the labels of every pair of adjacent vertices differ by at most b. In this paper, we present a 2-approximation algorithm for the Bandwidth problem that takes worst-case Ο(1.9797ⁿ) = Ο(3{sup 0.6217n}) time and uses polynomial space. This improves both the previous best 2- and 3-approximation algorithms of Cygan et al. which have an Ο*(3ⁿ) and Ο*(2ⁿ) worst-case time bounds, respectively. Our algorithm is based on constructing bucket decompositions of the input graph. A bucket decomposition partitions the vertex set of a graph into ordered sets (called buckets) of (almost) equal sizes such that all edges are either incident on vertices in the same bucket or on vertices in two consecutive buckets. The idea is to find the smallest bucket size for which there exists a bucket decomposition. The algorithm uses a simple divide-and-conquer strategy along with dynamic programming to achieve this improved time bound.
- Note:
- Published through SciTech Connect.

01/01/2009.

"la-ur-09-04594"

" la-ur-09-4594"

Fourth International Workshop on Parameterized and Exact Computation ; September 10, 2009 ; Copenhagen, Denmark.

Kasiviswanathan, Shiva; Furer, Martin; Gaspers, Serge. - Funding Information:
- AC52-06NA25396

View MARC record | catkey: 14653804