f5e660b9a3
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1114 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
80 lines
1.8 KiB
Plaintext
80 lines
1.8 KiB
Plaintext
|
|
:- object(bridge,
|
|
instantiates(heuristic_state_space)).
|
|
|
|
|
|
:- info([
|
|
version is 1.1,
|
|
author is 'Paulo Moura',
|
|
date is 2004/8/15,
|
|
comment is 'Bridge puzzle.']).
|
|
|
|
|
|
:- uses(list, [append/3]).
|
|
:- uses(numberlist, [min/2, max/2]).
|
|
:- uses(set, [insert/3, insert_all/3, select/3]).
|
|
|
|
|
|
initial_state(start, ([], right, [1,3,6,8,12])).
|
|
|
|
|
|
goal_state(end, ([1,3,6,8,12], left, [])).
|
|
|
|
|
|
next_state((Left1, left, Right1), (Left2, right, Right2), Slower) :- % two persons
|
|
append(List, [Person1| Persons], Left1),
|
|
select(Person2, Persons, Others),
|
|
append(List, Others, Left2),
|
|
insert_all([Person1, Person2], Right1, Right2),
|
|
(Person1 > Person2 ->
|
|
Slower = Person1
|
|
;
|
|
Slower = Person2).
|
|
|
|
next_state((Left1, right, Right1), (Left2, left, Right2), Slower) :- % two persons
|
|
append(List, [Person1| Persons], Right1),
|
|
select(Person2, Persons, Others),
|
|
append(List, Others, Right2),
|
|
insert_all([Person1, Person2], Left1, Left2),
|
|
(Person1 > Person2 ->
|
|
Slower = Person1
|
|
;
|
|
Slower = Person2).
|
|
|
|
next_state((Left1, left, Right1), (Left2, right, Right2), Person) :- % one person
|
|
select(Person, Left1, Left2),
|
|
insert(Right1, Person, Right2).
|
|
|
|
next_state((Left1, right, Right1), (Left2, left, Right2), Person) :- % one person
|
|
select(Person, Right1, Right2),
|
|
insert(Left1, Person, Left2).
|
|
|
|
|
|
heuristic((Left, Lamp, Right), Heuristic) :-
|
|
Lamp = left ->
|
|
list::min(Left, Heuristic)
|
|
;
|
|
list::max(Right, Max),
|
|
list::min(Right, Min),
|
|
Heuristic is Max + Min.
|
|
|
|
|
|
print_state((Left, Lamp, Right)) :-
|
|
write_list(Left),
|
|
(Lamp = left ->
|
|
write(' lamp _|____________|_ ')
|
|
;
|
|
write(' _|____________|_ lamp ')),
|
|
write_list(Right),
|
|
nl.
|
|
|
|
|
|
write_list([]).
|
|
|
|
write_list([Head| Tail]) :-
|
|
write(Head), write(' '),
|
|
write_list(Tail).
|
|
|
|
|
|
:- end_object.
|