32 lines
925 B
Mathematica
32 lines
925 B
Mathematica
:- module day1.
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:- interface.
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:- import_module basics.
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:- import_module list.
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:- import_module univ.
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:- pred run(part::in, list(string)::in, univ::out) is cc_multi.
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:- implementation.
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:- import_module std_util.
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:- import_module maybe.
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:- import_module string.
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:- import_module int.
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:- pragma no_determinism_warning(run/3).
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run(one, Lines, univ(det_head(go(Lines)))).
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run(two, Lines, univ(sum(take_upto(3, go(Lines))))).
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:- func go(list(string)) = list(int).
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go(Lines) =
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sort(converse(ordering), map(sum, gather(map(to_int_may, Lines)))).
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:- func gather(list(maybe(T))) = list(list(T)).
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gather(Xs) = Ys :- gather(Xs, Ys).
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:- pred gather(list(maybe(T))::in, list(list(T))::out(non_empty_list)) is det.
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gather([], [[]]).
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gather([no | Xs], [[] | Yss]) :- gather(Xs, Yss).
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gather([yes(Y) | Xs], [[Y | Ys] | Yss]) :- gather(Xs, [Ys | Yss]).
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:- func sum(list(int)) = int.
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sum(Xs) = foldl(plus, Xs, 0).
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