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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影响因子:
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通讯作者:
Radu Curticapean
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文献类型:
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作者:
Radu Curticapean
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.