45 lines
991 B
Perl
45 lines
991 B
Perl
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numbers_strings([], []).
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numbers_strings([A|As], [B|Bs]) :-
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number_string(A, B),
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numbers_strings(As, Bs).
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read_file(Stream, X) :-
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\+ at_end_of_stream(Stream),
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read_line_to_codes(Stream, C),
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string_chars(S, C),
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split_string(S, ",", "", Y),
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numbers_strings(X, Y),
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at_end_of_stream(Stream).
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main :-
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open('../input/06', read, Stream),
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read_file(Stream, Lines), !,
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close(Stream),
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iterate_n(256, Lines, Res),
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length(Res, N),
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print(N).
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tick_existing([], [], 0).
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tick_existing([0|Xs], [6|Ys], New) :-
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tick_existing(Xs, Ys, New1),
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New is New1 + 1.
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tick_existing([X|Xs], [Y|Ys], New) :-
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X > 0,
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tick_existing(Xs, Ys, New),
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Y is X - 1.
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spawn_n(0, []).
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spawn_n(N, [8|Ys]) :-
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N1 is N - 1,
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spawn_n(N1, Ys).
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iterate(X, Y) :-
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tick_existing(X, Y0, New), !,
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spawn_n(New, Y1),
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append(Y0, Y1, Y), !.
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iterate_n(0, X, X).
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iterate_n(N, X, Y) :-
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N1 is N - 1,
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iterate(X, Y0), !,
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iterate_n(N1, Y0, Y), !.
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