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arXiv 1703.09421cs.DS
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旋转边匹配问题

Edge-matching Problems with Rotations

Martin Ebbesen, Paul Fischer, Carsten Witt

摘要:

边匹配问题,也称为边匹配难题,是对具有邻域条件的布局问题的抽象。带有彩色边缘的作品必须放置在一块板上,使相邻的边缘具有相同的颜色。这个问题最近随着(现已终止的)Eternity~II谜题和新的复杂性结果而引起了人们的兴趣。在本文中,我们考虑了一些设置不同的大小的难题和操纵允许的作品。我们调查的影响,允许旋转的件上的问题的复杂性,一个方面,到目前为止,只有轻微处理。我们证明了一些问题有多项式时间算法,而另一些问题是NP完全的。特别是,我们表明,允许旋转的单行难题,使问题NP难。硬度结果的校样使用了大量的颜色。这是必不可少的,因为我们还表明,这个问题(和另一个相关的)是固定参数的易处理的,其中相关的参数是颜色的数量。

英文摘要:

Edge-matching problems, also called edge matching puzzles, are abstractions of placement problems with neighborhood conditions. Pieces with colored edges have to be placed on a board such that adjacent edges have the same color. The problem has gained interest recently with the (now terminated) Eternity~II puzzle, and new complexity results. In this paper we consider a number of settings which differ in size of the puzzles and the manipulations allowed on the pieces. We investigate the effect of allowing rotations of the pieces on the complexity of the problem, an aspect that is only marginally treated so far. We show that some problems have polynomial time algorithms while others are NP-complete. Especially we show that allowing rotations in one-row puzzles makes the problem NP-hard. The proofs of the hardness result uses a large number of colors. This is essential because we also show that this problem (and another related one) is fixed-parameter tractable, where the relevant parameter is the number of colors.

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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