Rubikova kocka vždy vyriešiteľná na 20 ťahov, dokázali výpočtom na serveroch Google
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nice_
Od: matuli
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Pridané:
2010-08-12 15:24:07
How We Did It
How did we solve all 43,252,003,274,489,856,000 positions of the Cube?
* We partitioned the positions into 2,217,093,120 sets of 19,508,428,800 positions each.
* We reduced the count of sets we needed to solve to 55,882,296 using symmetry and set covering.
* We did not find optimal solutions to each position, but instead only solutions of length 20 or less.
* We wrote a program that solved a single set in about 20 seconds.
* We used about 35 CPU years to find solutions to all of the positions in each of the 55,882,296 sets.
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