# Looking for a Sudoku Algorithm to implement in Ruby

Hey,

Did anyone know of a Sudoku algorithm, which I can use to implement a
Ruby
solution?
Although I can solve Sudoku without much difficulty, I can’t say the
same
when I try to write a Ruby program to solve Soduku.

Thanks,

Victor

Victor R. wrote:

Did anyone know of a Sudoku algorithm, which I can use to implement a Ruby
solution?

You might want to have a look at Ruby Q. #43 (Sudoku Solver):
http://www.rubyquiz.com/quiz43.html

Alternatively you could also solve it using constraint programming with
Gecode/R: http://gecoder.rubyforge.org/examples/sudoku.html

Hi…

The following projects on codeproject may give you some ideas…

Thanks,
Hari

PS : This is my first post. Sorry if I should not post links to other
language articles. just wanted to help…

Thanks to everyone for your suggestions and recommendations.
I truly appreciate all your input.

Thanks again,

Victor

Looking for a Sudoku Algorithm to implement in Ruby
Posted by Victor R. (Guest) on 10.11.2007 17:51
Hey,

Did anyone know of a Sudoku algorithm, which I can use to implement a Ruby solution?
. . .

Here’s yet another one:

Sudoku solver in Ruby using SAT (Boolean satisfiability problem)

http://eli.thegreenplace.net/programs-and-code/

Cheers,

j.k.

On Nov 10, 10:50 am, Victor R. [email protected] wrote:

Hey,

Did anyone know of a Sudoku algorithm, which I can use to implement a Ruby
solution?

The Soduku puzzle can be solved in a few seconds by a very simple
backtracking algorithm:

current_cell = first_empty_cell

while true
if put_next_possible_number_in_current_cell
if all_cells_filled
print_solution
exit
else
current_cell = next_empty_cell
end
else if current_cell = first_empty_cell
raise Exception.new(“no solution”)
else
current_cell = previous_empty_cell
end