142 lines
4.2 KiB
Mathematica
142 lines
4.2 KiB
Mathematica
:- module day11.
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:- interface.
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:- import_module basics.
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:- pred run(part::in, lines::in, answer::out) is cc_multi.
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:- implementation.
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:- import_module int.
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:- import_module string.
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:- import_module list.
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:- type item == int.
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:- type op ---> add(int); mul(int); square.
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:- type test == int.
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:- type monkey --->
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m(items :: list(item),
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op :: op, test :: test,
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if_true :: int, if_false :: int,
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inspected :: int).
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:- func inspected(monkey) = int.
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:- func test(monkey) = int.
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:- type monkeys == list(monkey).
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:- type divmod ---> dm(d :: int, m :: int).
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:- func op(op, item) = item.
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op(add(M), N) = M + N.
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op(mul(M), N) = M * N.
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op(square, N) = N * N.
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:- func op(op, divmod, item) = item.
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op(O, dm(D, M), N) = op(O, N) `div` D `mod` M.
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:- pred test(test::in, item::in) is semidet.
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test(M, N) :- N mod M = 0.
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:- import_module parsing_utils.
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eof(Src) --> not next_char(Src, _).
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:- pred kw(src::in, string::in, ps::in, ps::out) is semidet.
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kw(Src, Kw) --> ikeyword("abcdefghijklmnopqrstuvwxyz", Kw, Src, _).
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:- pred kws(src::in, list(string)::in, ps::in, ps::out) is semidet.
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kws(_, []) --> [].
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kws(Src, [Kw | Kws]) --> kw(Src, Kw), kws(Src, Kws).
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colon(Src) --> punct(":", Src, _).
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comma(Src) --> punct(",", Src, _).
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equal(Src) --> punct("=", Src, _).
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plus(Src) --> punct("+", Src, _).
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star(Src) --> punct("*", Src, _).
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:- pred monkeys(src::in, monkeys::out, ps::in, ps::out) is semidet.
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monkeys(Src, Ms) --> one_or_more(monkey, Src, Ms), eof(Src).
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:- pred monkey(src::in, monkey::out, ps::in, ps::out) is semidet.
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monkey(Src, m(reverse(I), O, P, T, F, 0)) -->
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kw(Src, "monkey"), int_literal_as_string(Src, _), colon(Src),
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kws(Src, ["starting", "items"]), colon(Src), items(Src, I),
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kw(Src, "operation"), colon(Src),
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kw(Src, "new"), equal(Src), op(Src, O),
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kw(Src, "test"), colon(Src), test(Src, P),
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kws(Src, ["if", "true"]), colon(Src), act(Src, T),
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kws(Src, ["if", "false"]), colon(Src), act(Src, F).
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:- pred items(src::in, list(item)::out, ps::in, ps::out) is semidet.
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items(Src, Is) --> comma_separated_list(int_literal, Src, Is).
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:- pred op(src::in, op::out, ps::in, ps::out) is semidet.
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op(Src, Op) -->
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kw(Src, "old"),
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(if star(Src) then
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(if int_literal(Src, N) then {Op = mul(N)}
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else kw(Src, "old"), {Op = square})
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else plus(Src), int_literal(Src, N), {Op = add(N)}).
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:- pred test(src::in, test::out, ps::in, ps::out) is semidet.
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test(Src, N) --> kws(Src, ["divisible", "by"]), int_literal(Src, N).
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:- pred act(src::in, int::out, ps::in, ps::out) is semidet.
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act(Src, N) --> kws(Src, ["throw", "to", "monkey"]), int_literal(Src, N).
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:- pred give(item::in, int::in, monkeys::in, monkeys::out) is det.
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give(_, _, [], _) :- die("list too short").
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give(I, N, [!.M | !.Ms], [!:M | !:Ms]) :-
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if N = 0 then !M^items := [I | !.M^items]
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else give(I, N - 1, !Ms).
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:- pred get(int::in, monkey::out, monkeys::in, monkeys::out) is semidet.
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get(N, X, [!.M | !.Ms], [!:M | !:Ms]) :-
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if N = 0 then
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X = !.M,
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!M^inspected := !.M^inspected + length(!.M^items),
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!M^items := []
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else
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get(N - 1, X, !Ms).
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:- pred step(divmod::in, monkey::in, int::in, monkeys::in, monkeys::out) is det.
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step(DM, M, I, !Ms) :-
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I2 = op(M^op, DM, I),
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(if test(M^test, I2) then
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give(I2, M^if_true, !Ms)
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else
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give(I2, M^if_false, !Ms)).
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:- pred turn(divmod::in, int::in, monkeys::in, monkeys::out) is semidet.
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turn(DM, I, !Ms) :-
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get(I, M, !Ms),
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foldr(step(DM, M), M^items, !Ms).
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:- pred round(divmod::in, int::in, monkeys::in, monkeys::out) is det.
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round(DM, I, !Ms) :-
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if turn(DM, I, !Ms) then round(DM, I + 1, !Ms) else true.
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:- pred round(divmod::in, monkeys::in, monkeys::out) is det.
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round(DM, !Ms) :- round(DM, 0, !Ms).
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:- pred rounds(divmod::in, int::in, monkeys::in, monkeys::out) is det.
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rounds(DM, N, !Ms) :-
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if N = 0 then true else
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round(DM, !Ms),
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rounds(DM, N - 1, !Ms).
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:- pred rounds(part::in, monkeys::in, monkeys::out) is det.
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rounds(Part, !Ms) :-
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DM = dm(part(Part, 3, 1), prod(map(test, !.Ms))),
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rounds(DM, part(Part, 20, 10_000), !Ms).
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run(Part, Lines, Out) :-
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parse(join_list("\n", Lines), one_or_more(monkey), Res),
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(if Res = ok(Monkeys) then
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rounds(Part, Monkeys, Final),
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Out = int(prod(take_upto(2, rev_sort(map(inspected, Final)))))
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else
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Out = 'new other'(Res)).
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