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Sudoku solution from Seven Languages in Seven Weeks, SWI-Prolog version
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%% https://www.swi-prolog.org/man/clpfd.html | |
:- use_module(library(clpfd)). | |
%% --- | |
%% Excerpted from "Seven Languages in Seven Weeks", | |
%% published by The Pragmatic Bookshelf. | |
%% Copyrights apply to this code. It may not be used to create training material, | |
%% courses, books, articles, and the like. Contact us if you are in doubt. | |
%% We make no guarantees that this code is fit for any purpose. | |
%% Visit http://www.pragmaticprogrammer.com/titles/btlang for more book information. | |
%% --- | |
valid([]). | |
valid([Head|Tail]) :- | |
%fd_all_different(Head), | |
all_distinct(Head), | |
valid(Tail). | |
sudoku(Puzzle, Solution) :- | |
Solution = Puzzle, | |
Puzzle = [S11, S12, S13, S14, | |
S21, S22, S23, S24, | |
S31, S32, S33, S34, | |
S41, S42, S43, S44], | |
%fd_domain(Solution, 1, 4), | |
Solution ins 1..4, | |
Row1 = [S11, S12, S13, S14], | |
Row2 = [S21, S22, S23, S24], | |
Row3 = [S31, S32, S33, S34], | |
Row4 = [S41, S42, S43, S44], | |
Col1 = [S11, S21, S31, S41], | |
Col2 = [S12, S22, S32, S42], | |
Col3 = [S13, S23, S33, S43], | |
Col4 = [S14, S24, S34, S44], | |
Square1 = [S11, S12, S21, S22], | |
Square2 = [S13, S14, S23, S24], | |
Square3 = [S31, S32, S41, S42], | |
Square4 = [S33, S34, S43, S44], | |
valid([Row1, Row2, Row3, Row4, | |
Col1, Col2, Col3, Col4, | |
Square1, Square2, Square3, Square4]). |
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