30 lines
831 B
Prolog
30 lines
831 B
Prolog
|
|
% Prolog Sudoku Solver (C) 2007 Markus Triska (triska@gmx.at)
|
|
% Public domain code.
|
|
|
|
:- use_module(library(clpfd)).
|
|
|
|
% Pss is a list of lists representing the game board.
|
|
|
|
sudoku(Pss) :-
|
|
flatten(Pss, Ps),
|
|
maplist(all_in(1..9), Ps),
|
|
maplist(all_different, Pss),
|
|
Pss = [R1,R2,R3,R4,R5,R6,R7,R8,R9],
|
|
columns(R1, R2, R3, R4, R5, R6, R7, R8, R9),
|
|
blocks(R1, R2, R3), blocks(R4, R5, R6), blocks(R7, R8, R9),
|
|
label(Ps).
|
|
|
|
columns([], [], [], [], [], [], [], [], []).
|
|
columns([A|As],[B|Bs],[C|Cs],[D|Ds],[E|Es],[F|Fs],[G|Gs],[H|Hs],[I|Is]) :-
|
|
all_different([A,B,C,D,E,F,G,H,I]),
|
|
columns(As, Bs, Cs, Ds, Es, Fs, Gs, Hs, Is).
|
|
|
|
blocks([], [], []).
|
|
blocks([X1,X2,X3|R1], [X4,X5,X6|R2], [X7,X8,X9|R3]) :-
|
|
all_different([X1,X2,X3,X4,X5,X6,X7,X8,X9]),
|
|
blocks(R1, R2, R3).
|
|
|
|
all_in(D, Pos) :-
|
|
Pos in D.
|