我在 Prolog 中实现了 Einstein Riddle,我试图找出谁在家里养了一条鱼。
我在此代码中找不到错误,并且跟踪选项无助于解决此问题;)
规则:
- 挪威人住在第一所房子里
- 英国人住在一座红房子里。
- 温室直接位于白宫的左侧。
- 丹麦人喝茶。
- 轻度吸烟者住在猫的饲养者旁边。
- 黄色房子的居民抽着雪茄。
- 德国人抽水烟。
- 中心房屋的居民喝牛奶。
- 轻度吸烟者有一个喝水的邻居。
- 没有过滤嘴的香烟会繁殖鸟类。
- 瑞典人饲养的狗。
- 挪威人住在蓝屋旁边。
- 饲养马的人住在黄色房子旁边。
- 抽薄荷醇喝啤酒。
- 他们在温室里喝咖啡。
这是我的代码:
on_the_left(X, Y, N) :-
Y is X - 1,
\+ Y < 1,
\+ X > N.
next_to(X, Y, N) :-
( Y is X + 1;
Y is X - 1),
\+ X > N,
\+ Y > N,
\+ X < 1,
\+ Y < 1.
fish(Who) :-
Houses = [
house(1, _Color1, _From1, _Animal1, _Drink1, _Smoke1),
house(2, _Color2, _From2, _Animal2, _Drink2, _Smoke2),
house(3, _Color3, _From3, _Animal3, _Drink3, _Smoke3),
house(4, _Color4, _From4, _Animal4, _Drink4, _Smoke4),
house(5, _Color5, _From5, _Animal5, _Drink5, _Smoke5) ],
N is 5,
%-- hint 1
member(house(1, _, norway, _, _, _), Houses),
%-- hint 2
member(house(_, red, england, _, _, _), Houses),
%-- hint 3 - on_the_left
member(house(GREEN, green, _, _, _, _), Houses),
member(house(WHITE, white, _, _, _, _), Houses),
on_the_left(GREEN, WHITE, N),
%-- hint 4
member(house(_, _, denmark, _, tea, _), Houses),
%-- hint 5 - next_to
member(house(LIGHT, _, _, _, _, light), Houses),
member(house(CAT, _, _, cat, _, light), Houses),
next_to(LIGHT, CAT, N),
%-- hint 6
member(house(_, yellow, _, _, _, cigar), Houses),
%-- hint 7
member(house(_, _, germany, _, _, waterpipe), Houses),
%-- hint 8
member(house(3, _, _, _, milk, _), Houses),
%-- hint 9 - next_to
member(house(WATER, _, _, _, water, _), Houses),
next_to(LIGHT, WATER, N),
%-- hint 10
member(house(_, _, _, bird, _, nofilter), Houses),
%-- hint 11
member(house(_, _, sweden, dog, _, _), Houses),
%-- hint 12 - next_to
member(house(NORWAY, _, norway, _, _, _), Houses),
member(house(BLUE, blue, _, _, _, _), Houses),
next_to(NORWAY, BLUE, N),
%-- hint 13 - next_to
member(house(HORSE, _, _, horse, _, _), Houses),
next_to(HORSE, GREEN, N),
%-- hint 14
member(house(_, _, _, _, beer, menthol), Houses),
%-- hint 15
member(house(_, green, _, _, coffee, _), Houses),
%-- FINAL QUESTION - WHO LET THE FISH OUT?
member(house(_, _, _, fish, _, _), Houses),
member(house(_, _, Who, fish, _, _), Houses).
我尝试了很多组合,但是:
?- 鱼(谁)。
错误的。
编辑:
代码现在可以工作,我改变了什么:
1* 来自:
%-- hint 5 - next_to
member(house(LIGHT, _, _, _, _, light), Houses),
member(house(CAT, _, _, cat, _, light), Houses),
至:
%-- hint 5 - next_to
member(house(LIGHT, _, _, _, _, light), Houses),
member(house(CAT, _, _, cat, _, _), Houses),
2* 来自:
%-- hint 13 - next_to
member(house(HORSE, _, _, horse, _, _), Houses),
next_to(HORSE, GREEN, N),
至:
%-- hint 13 - next_to
member(house(YELLOW, yellow, _, _, _, _), Houses),
member(house(HORSE, _, _, horse, _, _), Houses),
next_to(HORSE, YELLOW, N),
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