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- W2000872069 abstract "Graph colorability (COL), is a typical constraint satisfaction problem to which phase transition phenomena (PTs), are important in the computational complexity of combinatorial search algorithms. PTs are significant and subtle because, in the PT region, extraordinarily hard problem instances are found, which may require exponential-order computational time to solve. To clarify PT mechanism, many studies have been undertaken to produce very hard instances, many of which were based on generate-and-test approaches. We propose a rather systematic or constructive algorithm that repeats the embedding of 4-critical graphs to arbitrarily generate large extraordinarily hard 3-colorability instances. We demonstrated experimentally that the computational cost to solve our generated instances is of an exponential order of the number of vertices by using a few actual coloring algorithms and constraint satisfaction algorithms." @default.
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- W2000872069 date "2008-01-01" @default.
- W2000872069 modified "2023-09-25" @default.
- W2000872069 title "Constructive generation of very hard 3-colorability instances" @default.
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- W2000872069 doi "https://doi.org/10.1016/j.dam.2006.07.015" @default.
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