ago wrote:
[Something I mostly agree with]
According to Anton the number of possible solutions can be reduced
using 1) number swapping, 2) mirroring, 3) blocks/rows/columns
swapping. All those operations create equivalent matrices. For a 9X9
grid, this should give a reduction factor =
Anton,
Do you think it is possible to reduce the set of all possible solutions
to a small enough set? I personally doubt it, but IF that was the case
an efficient solver could be easily created.
In reducing the set of all solutions for instance you could always swap
the numbers (3rd axis) so
Your reduction-first approach makes short work of
them, though. On the other hand, my version probably didn't take as long
to write!
Well, I started from the reduction-only algorithm so by the time I
implemented the brute force solver I already had the code. Anyway the
full code is just above
ago wrote:
Do you think it is possible to reduce the set of all possible solutions
to a small enough set? I personally doubt it, but IF that was the case
an efficient solver could be easily created.
No I don't think so, but it's a great idea :-) . Iff we would have some
ultimate symmetry
Do you think it is possible to reduce the set of all possible solutions
to a small enough set? I personally doubt it, but IF that was the case
an efficient solver could be easily created.
To expand on the concept, assume for the argument sake that the
universe of possible solutions can be
ago wrote:
But to inflate my ego beyond the known universe, here is my solver
(that solves the avove mentioned grid reasonably fast). I suppose the
only difference is that is uses 3, rather than 2, rules to simplify
before starting tree-like search.
Thanks for the nice problem and the nice
But to inflate my ego beyond the known universe, here is my solver
(that solves the avove mentioned grid reasonably fast). I suppose the
only difference is that is uses 3, rather than 2, rules to simplify
before starting tree-like search.
Thanks for the nice problem and the nice post.
The
ago wrote:
You can see my amended code in the link above.
Thanks, I will look into it sometime. At the moment I'm at a library
computer, which severely limits my Python options. Meanwhile I have
been thinking about the sudoku problem, maybe it will prompt you, me or
someone else to make some
ago wrote:
Inspired by some recent readings on LinuxJournal and an ASPN recipe, I
decided to revamp my old python hack... The new code is a combination
of (2) reduction methods and brute force and it is quite faster than
the
ASPN program. If anyone is interested I attached the code in
ago wrote:
Inspired by some recent readings on LinuxJournal and an ASPN recipe, I
decided to revamp my old python hack... The new code is a combination
of (2) reduction methods and brute force and it is quite faster than
the
ASPN program. If anyone is interested I attached the code in
There is more in this thread:
http://groups.google.com/group/comp.lang.python/browse_frm/thread/479c1dc768f740a3/9252dab14e8ecabb?q=sudokurnum=2#9252dab14e8ecabb
Enjoy,
Bas
--
http://mail.python.org/mailman/listinfo/python-list
Inspired by some recent readings on LinuxJournal and an ASPN recipe, I
decided to revamp my old python hack... The new code is a combination
of (2) reduction methods and brute force and it is quite faster than
the
ASPN program. If anyone is interested I attached the code in
Hi,Funny that this just came up in Linux Format, the winner entry was:http://rightside.fissure.org/sudoku/ Won first in the Linux Format Bounty (
http://www.linuxformat.co.uk/bounty).
Congrats to David McLeish.-- enter shameless plug and self promotion --You can digg the page here submitted by
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