129 lines
183 KiB
Prolog
129 lines
183 KiB
Prolog
:- table valid/1.
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:- table pipe_at/2.
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% :- table path/3.
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% :- table path/5.
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:- table vert/3. :- table horz/3. :- table el/3. :- table jay/3.
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:- table seven/3. :- table eff/3. :- table ess/3.
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answer(Answer) :-
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% pipe_at(From, ess),
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% once(path(From, Via, From)),
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% [From | Via] = [74-18, 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|
|
% length([From | Via], ViaLen),
|
|
% once((ess_adjacent(Curr), path(From, Curr, From, 1, ViaLen))),
|
|
% writef('%t -> %t\n', [From, Via]),
|
|
input(Map), length(Map, MapHeight), MapMax is MapHeight - 1,
|
|
findall(X, between(0, MapMax, X), Xs),
|
|
maplist([X, 0]>>(println(X)), Xs, _),
|
|
% Answer is ViaLen div 2
|
|
true .
|
|
|
|
println(X) :-
|
|
input([Line1 | _]), length(Line1, LineLen), LineMax is LineLen - 1,
|
|
findall(X-Y, between(0, LineMax, Y), Coords),
|
|
maplist([A, 0]>>((
|
|
[From | Via] = [74-18, 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99-13,100-13,100-14,99-14,98-14,98-15,99-15,100-15,101-15,101-16,102-16,103-16,103-17,103-18,103-19,103-20,103-21,103-22,103-23,103-24,103-25,103-26,103-27,103-28,102-28,102-27,102-26,102-25,102-24,102-23,102-22,101-22,101-21,102-21,102-20,101-20,101-19,102-19,102-18,101-18,101-17,100-17,100-18,100-19,99-19,99-18,99-17,99-16,98-16,98-17,97-17,97-16,97-15,97-14,97-13,97-12,96-12,96-13,96-14,96-15,96-16,96-17,96-18,97-18,98-18,98-19,98-20,98-21,99-21,99-20,100-20,100-21,100-22,99-22,98-22,98-23,99-23,100-23,101-23,101-24,100-24,99-24,99-25,100-25,101-25,101-26,100-26,99-26,99-27,100-27,101-27,101-28,100-28,100-29,100-30,101-30,101-29,102-29,103-29,103-30,102-30,102-31,103-31,103-32,102-32,102-33,103-33,103-34,103-35,102-35,102-36,103-36,103-37,102-37,102-38,102-39,102-40,102-41,101-41,101-40,101-39,100-39,100-38,101-38,101-37,100-37,100-36,101-36,101-35,100-35,100-34,101-34,101-33,100-33,100-32,101-32,101-31,100-31,99-31,99-30,99-29,99-28,98-28,98-27,98-26,98-25,98-24,97-24,97-25,97-26,97-27,97-28,97-29,98-29,98-30,97-30,97-31,98-31,98-32,99-32,99-33,99-34,99-35,99-36,98-36,98-35,98-34,98-33,97-33,97-32,96-32,96-33,96-34,97-34,97-35,97-36,97-37,98-37,98-38,99-38,99-39,98-39,98-40,99-40,100-40,100-41,99-41,98-41,98-42,98-43,99-43,99-44,98-44,98-45,97-45,96-45,96-44,97-44,97-43,97-42,97-41,97-40,96-40,96-41,96-42,95-42,95-43,95-44,95-45,94-45,94-46,94-47,94-48,94-49,93-49,93-48,93-47,93-46,93-45,93-44,94-44,94-43,93-43,93-42,94-42,94-41,95-41,95-40,95-39,96-39,97-39,97-38,96-38,96-37,95-37,95-36,96-36,96-35,95-35,95-34,94-34,94-35,94-36,94-37,94-38,94-39,94-40,93-40,93-39,93-38,93-37,93-36,93-35,92-35,92-34,93-34,93-33,94-33,95-33,95-32,94-32,93-32,93-31,94-31,95-31,96-31,96-30,95-30,95-29,95-28,96-28,96-27,95-27,95-26,95-25,96-25,96-24,95-24,94-24,94-25,94-26,94-27,94-28,94-29,94-30,93-30,93-29,93-28,93-27,92-27,91-27,91-26,92-26,92-25,93-25,93-24,93-23,94-23,95-23,95-22,96-22,96-23,97-23,97-22,97-21,96-21,95-21,95-20,96-20,97-20,97-19,96-19,95-19,95-18,94-18,94-19,94-20,94-21,94-22,93-22,93-21,93-20,93-19,93-18,93-17,94-17,95-17,95-16,95-15,95-14,95-13,94-13,94-12,93-12,93-11,94-11,95-11,95-10,94-10,93-10,93-9,93-8,92-8,92-9,91-9,91-10,92-10,92-11,92-12,92-13,93-13,93-14,94-14,94-15,94-16,93-16,93-15,92-15,92-14,91-14,91-13,90-13,90-12,91-12,91-11,90-11,90-10,90-9,90-8,89-8,89-9,89-10,89-11,88-11,88-10,88-9,87-9,86-9,86-10,87-10,87-11,86-11,86-12,87-12,88-12,89-12,89-13,89-14,90-14,90-15,91-15,91-16,92-16,92-17,91-17,90-17,90-16,89-16,88-16,88-15,88-14,88-13,87-13,87-14,87-15,87-16,87-17,88-17,89-17,89-18,90-18,90-19,91-19,91-18,92-18,92-19,92-20,91-20,91-21,92-21,92-22,92-23,92-24,91-24,91-25,90-25,90-24,90-23,91-23,91-22,90-22,90-21,89-21,89-20,88-20,88-19,88-18,87-18,86-18,86-17,86-16,86-15,86-14,86-13,85-13,85-12,85-11,85-10,85-9,84-9,84-10,84-11,84-12,84-13,83-13,82-13,82-14,83-14,84-14,85-14,85-15,84-15,83-15,83-16,84-16,85-16,85-17,85-18,85-19,86-19,87-19,87-20,86-20,85-20,84-20,84-19,84-18,84-17,83-17,83-18,82-18,82-17,81-17,81-16,82-16,82-15,81-15,81-14,80-14,80-15,80-16,80-17,80-18,81-18,81-19,82-19,83-19,83-20,82-20,81-20,80-20,80-21,81-21,82-21,83-21,84-21,85-21,86-21,87-21,88-21,88-22,89-22,89-23,88-23,87-23,87-22,86-22,85-22,84-22,83-22,83-23,84-23,85-23,86-23,86-24,87-24,88-24,89-24,89-25,88-25,87-25,87-26,88-26,89-26,90-26,90-27,89-27,89-28,90-28,91-28,92-28,92-29,92-30,92-31,91-31,91-30,91-29,90-29,89-29,88-29,88-28,88-27,87-27,86-27,86-26,85-26,85-27,85-28,86-28,87-28,87-29,87-30,88-30,89-30,90-30,90-31,89-31,88-31,88-32,89-32,90-32,91-32,92-32,92-33,91-33,91-34,91-35,90-35,90-34,90-33,89-33,89-34,89-35,89-36,90-36,91-36,92-36,92-37,91-37,90-37,90-38,91-38,91-39,92-39,92-40,92-41,92-42,92-43,91-43,91-42,90-42,90-41,91-41,91-40,90-40,90-39,89-39,89-38,89-37,88-37,88-36,88-35,88-34,88-33,87-33,87-34,87-35,87-36,87-37,87-38,88-38,88-39,87-39,87-40,88-40,89-40,89-41,88-41,87-41,87-42,88-42,89-42,89-43,88-43,88-44,89-44,89-45,90-45,91-45,91-44,92-44,92-45,92-46,91-46,90-46,90-47,91-47,91-48,92-48,92-49,91-49,91-50,92-50,93-50,93-51,93-52,92-52,92-51,91-51,91-52,90-52,90-51,90-50,90-49,90-48,89-48,89-49,89-50,89-51,89-52,89-53,90-53,91-53,92-53,93-53,93-54,92-54,91-54,90-54,90-55,89-55,89-54,88-54,88-55,88-56,89-56,89-57,89-58,88-58,88-57,87-57,87-56,87-55,87-54,86-54,86-55,86-56,86-57,86-58,86-59,85-59,85-58,85-57,85-56,84-56,83-56,83-57,84-57,84-58,83-58,83-59,82-59,82-58,81-58,81-59,80-59,80-60,79-60,79-59,79-58,80-58,80-57,81-57,82-57,82-56,81-56,80-56,80-55,81-55,82-55,83-55,84-55,85-55,85-54,85-53,85-52,85-51,86-51,86-52,86-53,87-53,88-53,88-52,88-51,87-51,87-50,88-50,88-49,87-49,86-49,86-48,87-48,88-48,88-47,89-47,89-46,88-46,88-45,87-45,87-46,87-47,86-47,86-46,85-46,85-47,85-48,84-48,84-49,85-49,85-50,84-50,84-51,83-51,83-52,84-52,84-53,83-53,83-54,82-54,82-53,81-53,81-54,80-54,80-53,79-53,79-54,79-55,78-55,78-56,79-56,79-57,78-57,78-58,78-59,77-59,77-58,77-57,77-56,77-55,76-55,76-54,77-54,78-54,78-53,77-53,77-52,78-52,79-52,80-52,81-52,82-52,82-51,81-51,80-51,79-51,79-50,78-50,78-49,79-49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|
|
member(A, [From | Via]) -> nth0_2(A, E), writef('%n', [E]); write('.'))),
|
|
Coords, _),
|
|
write('\n').
|
|
|
|
% path(From, Curr, To, Dist, Final) :-
|
|
% pipe_at(Curr, CurrPipe),
|
|
% writef('%t -> %t (%t)\n', [From, Curr, CurrPipe]),
|
|
% CurrG =.. [CurrPipe, Curr, From, Next], CurrG,
|
|
% ( Next = To
|
|
% -> Final = Dist
|
|
% ; NewDist is Dist + 1,
|
|
% path(Curr, Next, To, NewDist, Final)
|
|
% ).
|
|
|
|
path(From, [Via], To) :-
|
|
pipe_at(Via, ViaPipe),
|
|
ViaG =.. [ViaPipe, Via, From, To], ViaG.
|
|
path(From, [Via1, Via2 | Vias], To) :-
|
|
path(From, [Via1], Via2),
|
|
path(Via1, [Via2 | Vias], To).
|
|
|
|
dot(_, _, _) :- fail.
|
|
|
|
vert(X-Y, X1-Y, X2-Y) :-
|
|
pipe_at(X-Y, vert),
|
|
( X1 is X+1, X2 is X-1
|
|
; X1 is X-1, X2 is X+1),
|
|
valid(X1-Y), valid(X2-Y).
|
|
|
|
horz(X-Y, X-Y1, X-Y2) :-
|
|
pipe_at(X-Y, horz),
|
|
( Y1 is Y+1, Y2 is Y-1
|
|
; Y1 is Y-1, Y2 is Y+1),
|
|
valid(X-Y1), valid(X-Y2).
|
|
|
|
el(X-Y, X1-Y1, X2-Y2) :-
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|
pipe_at(X-Y, el),
|
|
( Y1 = Y, X1 is X-1, Y2 is Y+1, X2 = X
|
|
; X1 = X, Y1 is Y+1, X2 is X-1, Y2 = Y),
|
|
valid(X1-Y1), valid(X2-Y2).
|
|
|
|
jay(X-Y, X1-Y1, X2-Y2) :-
|
|
pipe_at(X-Y, jay),
|
|
( Y1 = Y, X1 is X-1, Y2 is Y-1, X2 = X
|
|
; X1 = X, Y1 is Y-1, X2 is X-1, Y2 = Y),
|
|
valid(X1-Y1), valid(X2-Y2).
|
|
|
|
seven(X-Y, X1-Y1, X2-Y2) :-
|
|
pipe_at(X-Y, seven),
|
|
( Y1 = Y, X1 is X+1, Y2 is Y-1, X2 = X
|
|
; X1 = X, Y1 is Y-1, X2 is X+1, Y2 = Y),
|
|
valid(X1-Y1), valid(X2-Y2).
|
|
|
|
eff(X-Y, X1-Y1, X2-Y2) :-
|
|
pipe_at(X-Y, eff),
|
|
( Y1 = Y, X1 is X+1, Y2 is Y+1, X2 = X
|
|
; X1 = X, Y1 is Y+1, X2 is X+1, Y2 = Y),
|
|
valid(X1-Y1), valid(X2-Y2).
|
|
|
|
ess(X-Y, X1-Y1, X2-Y2) :-
|
|
pipe_at(X-Y, ess),
|
|
findall(Coord, ess_adjacent(Coord), [X1-Y1, X2-Y2]).
|
|
|
|
ess_adjacent(X1-Y1) :-
|
|
pipe_at(X-Y, ess),
|
|
( X1 is X-1, Y1 = Y, pipe_at(X1-Y1, El), points_down(El)
|
|
; X1 = X, Y1 is Y+1, pipe_at(X1-Y1, El), points_left(El)
|
|
; X1 is X+1, Y1 = Y, pipe_at(X1-Y1, El), points_up(El)
|
|
; X1 = X, Y1 is Y-1, pipe_at(X1-Y1, El), points_right(El)),
|
|
valid(X1-Y1).
|
|
|
|
points_down(El) :- (El=ess; El=vert; El=seven; El=eff).
|
|
points_left(El) :- (El=ess; El=horz; El=jay; El=seven).
|
|
points_up(El) :- (El=ess; El=vert; El=el; El=jay).
|
|
points_right(El) :- (El=ess; El=horz; El=el; El=eff).
|
|
|
|
valid(X-Y) :-
|
|
input(Map), length(Map, NRows),
|
|
Map = [Row0 | _], length(Row0, NCols),
|
|
X >= 0, Y >= 0,
|
|
X < NRows, Y < NCols.
|
|
|
|
% Element is at (Row, Column) in the map.
|
|
pipe_at(Row-Column, Element) :-
|
|
input(Map),
|
|
nth0(Row, Map, SubList),
|
|
nth0(Column, SubList, Symbol),
|
|
symbol_predicate(Symbol, Element).
|
|
|
|
nth0_2(Row-Column, Element) :-
|
|
input(Map),
|
|
nth0(Row, Map, SubList),
|
|
nth0(Column, SubList, Element).
|
|
|
|
symbol_predicate("|", vert).
|
|
symbol_predicate("-", horz).
|
|
symbol_predicate("L", el).
|
|
symbol_predicate("J", jay).
|
|
symbol_predicate("7", seven).
|
|
symbol_predicate("F", eff).
|
|
symbol_predicate(".", dot).
|
|
symbol_predicate("S", ess).
|