TPR-4x4x4-Solver

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TPR-4x4x4-Solver

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

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- MANIFEST.MF
- Center1.java
- Center2.java
- Center3.java
- CenterCube.java
- CornerCube.java
- Edge3.java
- EdgeCube.java
- FullCube.java
- MainProgram.java
- Moves.java
- Search.java
- solver.java
- test.java
- Tools.java
- Util.java
.gitignore
make.sh
README.md
twophase.jar

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TPR-4x4x4-Solver
================

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

- 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](http://cubezzz.dyndns.org/drupal/?q=node/view/73#comment-2588)
 - The solver merges Tsai's step3 and step4 into one step and use [min2phase package](https://github.com/ChenShuang/min2phase) to replace Tsai's step5-8

# TODO
 - Speeding up initialization.
 - Solution format.
 - Many bugs which might cause ArrayIndexOutOfBoundsException.

# License GPLv3

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

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
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.

TPR-4x4x4-Solver

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