Improved and Derandomized Approximations for Two-Criteria Metric Traveling Salesman
Improved and Derandomized Approximations for Two-Criteria Metric Traveling Salesman
复制标题
二标准度量旅行商的改进和去随机近似
DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
M. Witek
中科院分区:
文献类型:
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作者:
Christian Glaßer;Christian Reitwießner;M. Witek
We improve and derandomize the best known approximation algorithm for the twocriteria metric traveling salesman problem (2-TSP). More precisely, we construct a deterministic 2-approximation which answers an open question by Manthey. Moreover, we show that 2-TSP is randomized (3=2 + "; 2)-approximable, and we give the rst randomized approximations for the two-criteria traveling salesman path problems 2-TSPP, 2-TSPPs, and 2-TSPPst. We further provide arguments that indicate the hardness of improving our randomized approximation algorithms in the sense that such improvements force us to improve the best known approximations for TSP, TSPPs, and TSPPst (Christodes