論文

査読有り
2016年4月

On a generalization of "Eight Blocks to Madness" puzzle

DISCRETE MATHEMATICS
  • Kazuya Haraguchi

339
4
開始ページ
1400
終了ページ
1409
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.disc.2015.12.014
出版者・発行元
ELSEVIER SCIENCE BV

We consider a puzzle such that a set of colored cubes is given as an instance. Each cube has unit length on each edge and its surface is colored so that what we call the Surface Color Condition is satisfied. Given a palette of six colors, the condition requires that each face should have exactly one color and all faces should have different colors from each other. The puzzle asks to compose a 2 x 2 x 2 cube that satisfies the Surface Color Condition from eight suitable cubes in the instance. Note that cubes and solutions have 30 varieties respectively. In this paper, we give answers to three problems on the puzzle: (i) For every subset of the 30 solutions, is there an instance that has the subset exactly as its solution set? (ii) Create a maximum sized infeasible instance (i.e., one having no solution). (iii) Create a minimum sized universal instance (i.e., one having all 30 solutions). We solve the problems with the help of a computer search. We show that the answer to (i) is no. For (ii) and (iii), we show examples of the required instances, where their sizes are 23 and 12, respectively. The answer to (ii) solves one of the open problems that were raised in Berkove et al. (2008). (C) 2015 Elsevier B.V. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/j.disc.2015.12.014
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000369467500026&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.disc.2015.12.014
  • ISSN : 0012-365X
  • eISSN : 1872-681X
  • Web of Science ID : WOS:000369467500026

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