TPR-4x4x4-Solver

4x4x4 Solver = Three-Phase-Reduction Solver + 3x3x3 Solver

Usage

• sh make.sh # generate threephase.jar
• java -cp .:threephase.jar:twophase.jar test N # solving N random-state scrambled cubes.

Solve a specific cube from the command line

• java -cp .:threephase.jar:twophase.jar solver UUURUUUFUUUFUUUFRRRBRRRBRRRBRRRBRRRDFFFDFFFDFFFDDDDBDDDBDDDBDDDLFFFFLLLLLLLLLLLLULLLUBBBUBBBUBBB

Performance

• Command: "java -cp .:threephase.jar:twophase.jar test 2000"
• GUI demo: "java -cp .:threephase.jar:twophase.jar ui.MainProgram"
• Processor: Intel Core i7 2670QM
• Average solution length: 44.39 moves(face turn metric).
• Average solving time: 250 ms.
• Memory: <= 30M with min2phase package.
• Initialization time: 6s~7s
• Solution Length Distribution:
• 40 5
• 41 32
• 42 99
• 43 275
• 44 590
• 45 658
• 46 309
• 47 32

Note

• At its first executing, about 20M's tables will be generated and written to disk (md5(threephase.data) = 0ee2f10d29af8ada724a1426275512c5).

Algorithm

• Tsai's 8-step 4x4x4 algorithm
• The solver merges Tsai's step3 and step4 into one step and use min2phase package to replace Tsai's step5-8

TODO

• Speeding up initialization.
• Solution format.
• Many bugs which might cause ArrayIndexOutOfBoundsException.

License GPLv3

Copyright (C) 2023  Shuang Chen

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

License MIT

Copyright (c) 2023 Chen Shuang

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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