Counting Matchings of Size k Is W[1]-Hard

Counting Matchings of Size k Is W[1]-Hard
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DOI:
10.1007/978-3-642-39206-1_30
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发表时间:
2013-07
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通讯作者:
Radu Curticapean
Radu Curticapean
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其他
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作者:
Radu Curticapean

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我们证明了以下参数化计数问题的[1]-硬度:给定一个简单的无向图g和一个参数k∈n,计算sizekinG的匹配个数。从[1]中我们知道,给定一个边加权图g,很难在匹配inGisW[1]上计算一个特定的加权和。在本文中,我们展示了一个不需要权重的缩减。这解决了[5]中的一个开放问题,并在[5]的稀缺问题列表中增加了一个自然参数化计数问题。由于这个问题的经典版本得到了很好的研究,我们相信我们的结果有助于未来对其他问题的w[1]-硬度证明。
We proveW[1]-hardness of the following parameterized counting problem: Given a simple undirected graphGand a parameterk∈ ℕ, compute the number of matchings of sizekinG.It is known from [1] that, given an edge-weighted graphG, computing a particular weighted sum over the matchings inGisW[1]-hard. In the present paper, we exhibit a reduction that does not require weights.This solves an open problem from [5] and adds a natural parameterized counting problem to the scarce list ofW[1]-hard problems. Since the classical version of this problem is well-studied, we believe that our result facilitates futureW[1]-hardness proofs for other problems.