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Final_Q2.pl
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Final_Q2.pl
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create_Board(Rows,Columns,First_BombA,First_BombB,Second_BombA,Second_BombB,R) :-
Size is Columns * Rows,
length(List,Size),
maplist(=(1), List),
First_Bomb is ((First_BombA-1)*Columns) + (First_BombB-1),
update_index(First_Bomb,List,0,NewList),
Second_Bomb is ((Second_BombA-1)*Columns) + (Second_BombB-1),
update_index(Second_Bomb,NewList,0,FinalList),
set_global_value(Columns),
set_global_List(FinalList),
set_global_Array([]),
search([[FinalList,null,0,x,0]], [],R).
is_goal(State,Flag):-
move(State,Next,1),
Flag = 1 ,!.
is_goal(State,Flag):-
Flag = 0.
max_list([X], X).
max_list([X | Xs], Max) :-
max_list(Xs, T),
(X > T -> Max = X ; Max = T).
check_number(Num, Result) :-
get_global_Array(Array),
max_list(Array,Max),
(Num =:= Max ->
Result is 1
;
Result is 0
).
search(Open, Closed,R):-
getBestState(Open, [CurrentState,Parent,G,H,F], _), % Step 1
is_goal(CurrentState,Flag),
Flag = 0,
check_number(H,Result),
Result =1,
R = CurrentState.
search(Open, Closed,R):-
getBestState(Open, CurrentNode, TmpOpen),
getAllValidChildren(CurrentNode,TmpOpen,Closed,Children), % Step3
addChildren(Children, TmpOpen, NewOpen), % Step 4
append(Closed, [CurrentNode], NewClosed), % Step 5.1
search(NewOpen, NewClosed,R). % Step 5.2
getAllValidChildren(Node, Open, Closed, Children):-
findall(Next, getNextState(Node, Open, Closed, Next), Children).
getNextState([State,_,G,_,_],Open,Closed,[Next,State,NewG,NewH,NewF]):-
move(State, Next, MoveCost),
isOkay(Next),
get_global_List(FinalList),
calculateH(Next,FinalList,NewH),
NewG is G + MoveCost,
NewF is NewG + NewH,
not(member([Next,_,_,_,_], Open)),
not(member([Next,_,_,_,_], Closed)).
addChildren(Children, Open, NewOpen):-
append(Open, Children, NewOpen).
getBestState(Open, BestChild, Rest):-
findMax(Open, BestChild),
delete(Open, BestChild, Rest).
findMax([X], X):- !.
findMax([Head|T], Max):-
findMax(T, TmpMax),
Head = [_,_,_,HeadH,HeadF],
TmpMax = [_,_,_,TmpH,TmpF],
(TmpF >HeadF -> Max = TmpMax ; Max = Head),
get_global_Array(Array),
set_global_Array([TmpH|Array]).
memberButBetter(Next, List, NewF):-
findall(F, member([Next,_,_,_,F], List), Numbers),
max_list(Numbers, MaxOldF),
MaxOldF < NewF.
printSolution([State, null, G, H, F],_):-
write([State, G, H, F]), nl.
printSolution([State, Parent, G, H, F], Closed):-
member([Parent, GrandParent, PrevG, Ph, Pf], Closed),
printSolution([Parent, GrandParent, PrevG, Ph, Pf], Closed),
write([State, G, H, F]), nl.
move(FinalList, Next,1):-
horizontal(FinalList, Next).
move(FinalList, Next,1):-
vertical(FinalList, Next).
%[1,2,3,4,5]
%[2,[1,2,3,4,5],10,l=[1|R]]
%[1,[2,3,4,5],10,l=[2|R]]
update_index(0, [_|T], X, [X|T]).
update_index(I, [H|T], X, [H|R]) :-
I > 0,
J is I - 1,
update_index(J, T, X, R).
vertical(FinalList, Next):-
nth0(EmptyTileIndex, FinalList, 1),
nth0(BombIndex, FinalList, 0),
NewIndex is EmptyTileIndex + 1,
%(-)check that newindex is empty.
nth0(NewIndex, FinalList, R),
not(R = 0),
not(R = 2),
not(R = 6),
get_global_value(Value),
not(0 is NewIndex mod Value),
update_index(EmptyTileIndex,FinalList,6,List1),
update_index(NewIndex,List1,6,Next).
horizontal(FinalList, Next):-
nth0(EmptyTileIndex, FinalList, 1),
nth0(BombIndex, FinalList, 0),
get_global_value(Value),
%(-)check that newindex is empty.
NewIndex is EmptyTileIndex + Value,
nth0(NewIndex, FinalList, R),
not(R = 0),
not(R = 2),
not(R = 6),
update_index(EmptyTileIndex,FinalList,2,List1),
update_index(NewIndex,List1,2,Next).
calculateH([], [], 0):- !.
calculateH([Head|T1], [Head|T2], Hvalue):-
!,calculateH(T1, T2, Hvalue).
calculateH([_|T1], [_|T2], Hvalue):-
calculateH(T1, T2, Count),
Hvalue is Count + 1.
isOkay(_):- true.
% Define a predicate to set the global value
set_global_value(Value) :-
retractall(global_value(_)),
assertz(global_value(Value)).
% Define a predicate to get the global value
get_global_value(Value) :-
global_value(Value).
set_global_List(List) :-
retractall(global_List(_)),
assertz(global_List(List)).
get_global_List(List) :-
global_List(List).
set_global_Array(Array) :-
retractall(global_Array(_)),
assertz(global_Array(Array)).
get_global_Array(Array) :-
global_Array(Array).