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count(List, X, Count) :- count_sub(List, X, 0, Count). | |
count_sub([], _, N, N). | |
count_sub([Head | Xs], X, N, Count) :- | |
(Head == X -> N1 is N + 1; N1 is N), | |
count_sub(Xs, X, N1, Count). | |
% トランプの数は1〜13まで。 | |
card(X) :- between(1, 13, X). | |
% さやかのヒントにあてはまる。 | |
is_satisfy_sayaka_said(CardA, CardB) :- | |
card(CardA), | |
card(CardB), | |
CardA =\= 1, | |
CardB =\= 1, | |
CardA =\= CardB, | |
CardB mod CardA =:= 0. | |
% 相手の数字を確定できる。 | |
can_guess(WinnerCard, AllCandidates) :- | |
flatten(AllCandidates, AllCandidateCards), | |
card(WinnerCard), | |
count(AllCandidateCards, WinnerCard, 1). | |
% どちらのカードからも、相手の数字を確定できない。 | |
cannot_eiter_guess(CardA, CardB, AllCandidates) :- | |
card(CardA), card(CardB), | |
not(can_guess(CardA, AllCandidates)), | |
not(can_guess(CardB, AllCandidates)). | |
% カードの組は、解候補に含まれる。 | |
is_candidate(CardA, CardB, AllCandidates) :- | |
member([CardA, CardB], AllCandidates); | |
member([CardB, CardA], AllCandidates). | |
% 以下の条件を満たす解である。 | |
% (1) さやかのヒントにあてはまる | |
% (2) どちらも相手の数字を確定できない | |
% (3) (2)を知ると、どちらかが相手の数字を確定できる | |
is_answer(WinnerCard, LoserCard) :- | |
findall([CardA, CardB], ( | |
is_satisfy_sayaka_said(CardA, CardB) | |
), CandidatesSatisfySayakaSaid), | |
findall([CardA, CardB], ( | |
% (1) | |
is_satisfy_sayaka_said(CardA, CardB), | |
% (2) | |
cannot_eiter_guess(CardA, CardB, CandidatesSatisfySayakaSaid) | |
), CandidatesWhenEitherCannotGuess), | |
% (3) | |
can_guess(WinnerCard, CandidatesWhenEitherCannotGuess), | |
is_candidate(WinnerCard, LoserCard, CandidatesWhenEitherCannotGuess). | |
% Result %%%%%%%%%%%%%%%%%%%%%%%%%%% | |
% | |
% ?- is_answer(CardA, CardB, Minami). | |
% CardA = Minami, Minami = 10, | |
% CardB = 2 ; | |
% false. |
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