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arXiv 1208.2329cs.DScs.DM
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计算完美匹配的一个新方向

A New Direction for Counting Perfect Matchings

Taisuke Izumi, Tadashi Wadayama

摘要:

本文提出了一种新的精确计算完美匹配的算法,它既不依赖于容斥原理,也不依赖于树分解。对于$2n$节点和$Δn$边的任意二分图,使得$Δ\geq 3$,我们的算法在$O^{\ast}(2^{(1 - 1/O(Δ\log Δ))n})$时间和指数空间上运行。与以往的算法相比,该算法在性能下降到$Δ$的增加是相当缓慢的意义上,实现了一个更好的时间界。我们的算法的主要思想是一个新的减少的问题,计算输入图的切重分布。这种简化的主要成分是从初等编码理论中推导出的MacWilliams恒等式。我们的整个算法的设计相结合,减少与非平凡的快速算法计算的削减重量分布。据我们所知,本文提出的方法是新的,可能是独立的利益。

英文摘要:

In this paper, we present a new exact algorithm for counting perfect matchings, which relies on neither inclusion-exclusion principle nor tree-decompositions. For any bipartite graph of $2n$ nodes and $Δn$ edges such that $Δ\geq 3$, our algorithm runs with $O^{\ast}(2^{(1 - 1/O(Δ\log Δ))n})$ time and exponential space. Compared to the previous algorithms, it achieves a better time bound in the sense that the performance degradation to the increase of $Δ$ is quite slower. The main idea of our algorithm is a new reduction to the problem of computing the cut-weight distribution of the input graph. The primary ingredient of this reduction is MacWilliams Identity derived from elementary coding theory. The whole of our algorithm is designed by combining that reduction with a non-trivial fast algorithm computing the cut-weight distribution. To the best of our knowledge, the approach posed in this paper is new and may be of independent interest.

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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