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arXiv 2102.08905cs.DScs.DM
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图上Gerrymandering的复杂性:路和树

The Complexity of Gerrymandering Over Graphs: Paths and Trees

Matthias Bentert, Tomohiro Koana, Rolf Niedermeier

摘要:

粗略地说,gerrymandering是有系统地操纵选区边界,使一个特定的(政治)政党赢得尽可能多的地区。虽然通常从地理的角度进行研究,解决社交网络结构,但Cohen-Zemach等人最近发起了对图上的选区划分的研究[AAMAS 2018]。解决了Ito等人的三个开放问题。[AAMAS 2019],我们对限制于路径和树的NP-hard问题Gerrymandering over Graphs的计算复杂性进行了分类。我们的结果,这主要是负面的性质(即,最坏情况下的硬度),特别是产生两个复杂的二分法的树木。例如,这个问题对于两方是多项式时间可解的,但对于三方则是弱NP-困难的。此外,我们表明,即使当输入图是一个路径的问题仍然是NP-困难的。

英文摘要:

Roughly speaking, gerrymandering is the systematic manipulation of the boundaries of electoral districts to make a specific (political) party win as many districts as possible. While typically studied from a geographical point of view, addressing social network structures, the investigation of gerrymandering over graphs was recently initiated by Cohen-Zemach et al. [AAMAS 2018]. Settling three open questions of Ito et al. [AAMAS 2019], we classify the computational complexity of the NP-hard problem Gerrymandering over Graphs when restricted to paths and trees. Our results, which are mostly of negative nature (that is, worst-case hardness), in particular yield two complexity dichotomies for trees. For instance, the problem is polynomial-time solvable for two parties but becomes weakly NP-hard for three. Moreover, we show that the problem remains NP-hard even when the input graph is a path.

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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