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- W7858725 abstract "Edge-matching problems, also called 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. We moreover show that many commonly considered puzzles can be emulated by simple puzzles with quadratic pieces, so that one can restrict oneself to investigating those." @default.
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- W7858725 date "2011-01-01" @default.
- W7858725 modified "2023-09-23" @default.
- W7858725 title "Edge-Matching Problems with Rotations" @default.
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- W7858725 doi "https://doi.org/10.1007/978-3-642-22953-4_10" @default.
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