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arXiv 0905.0283cs.DS
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星域的最优嵌入

Optimal Embedding Into Star Metrics

David Eppstein, Kevin A. Wortman

摘要:

我们对以下问题提出了一个O(n^3 log^2 n)时间算法:给定一个有限度量空间X,创建一个星型拓扑网络,以X的点作为它的叶子,使得星型中的距离至少与X中的距离一样大,具有最小的膨胀。作为我们算法的一部分,我们在同一时间范围内解决了参数负循环检测问题:给定一个有向图,其边权重是参数lambda的递增线性函数,找到lambda的最小值,使得该图不包含负权重循环。

英文摘要:

We present an O(n^3 log^2 n)-time algorithm for the following problem: given a finite metric space X, create a star-topology network with the points of X as its leaves, such that the distances in the star are at least as large as in X, with minimum dilation. As part of our algorithm, we solve in the same time bound the parametric negative cycle detection problem: given a directed graph with edge weights that are increasing linear functions of a parameter lambda, find the smallest value of lambda such that the graph contains no negative-weight cycles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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