136 lines
3.1 KiB
Perl
136 lines
3.1 KiB
Perl
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read_file(Stream, []) :-
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at_end_of_stream(Stream).
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read_file(Stream, [X|L]) :-
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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(X, C),
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read_file(Stream, L).
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split1([], [], []).
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split1([""|As], [], As). % starts with "" -> [], seq end
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split1([A|As], [A|Bs], X) :-
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A \= "",
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split1(As, Bs, X).
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split2([], []).
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split2([A|As], [B|Bs]) :-
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split1([A|As], B, C),
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split2(C, Bs).
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remove_x(_, [], []).
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remove_x(X, [X|As], Bs) :-
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remove_x(X, As, Bs).
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remove_x(X, [A|As], [A|Bs]) :-
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A \= X,
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remove_x(X, As, Bs).
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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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strings_board([], []).
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strings_board([A|As], [B|Bs]) :-
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split_string(A, " ", "", C),
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remove_x("", C, D),
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numbers_strings(B, D),
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strings_board(As, Bs).
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stringss_boards([], []).
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stringss_boards([A|As], [B|Bs]) :-
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strings_board(A, B),
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stringss_boards(As, Bs).
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parse_boards(L, A) :-
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split2(L, B),
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remove_x([], B, C),
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stringss_boards(C, A).
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parse_file([X|L], N, B) :-
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split_string(X, ",", "", A),
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numbers_strings(N, A),
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parse_boards(L, B).
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main :-
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open('../input/04', read, Stream),
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read_file(Stream, Lines), !,
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close(Stream),
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parse_file(Lines, A, B),
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step_first_board_win(A, B, C),
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print(C).
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mark_nums_row(_, [], []).
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mark_nums_row(N, [R|Rs], [1|Xs]) :-
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append([_, [R], _], N),
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mark_nums_row(N, Rs, Xs).
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mark_nums_row(N, [R|Rs], [0|Xs]) :-
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\+ append([_, [R], _], N),
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mark_nums_row(N, Rs, Xs).
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mark_nums_board(_, [], []).
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mark_nums_board(N, [B|Bs], [C|Cs]) :-
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mark_nums_row(N, B, C),
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mark_nums_board(N, Bs, Cs).
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rows_win([R|Rs]) :-
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(R = [1,1,1,1,1]; rows_win(Rs)).
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transpose([[]|_], []).
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transpose(A, [B|Bs]) :-
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first_column(A, B, C),
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transpose(C, Bs).
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first_column([], [], []).
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first_column([[B|C]|As], [B|Bs], [C|Cs]) :-
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first_column(As, Bs, Cs).
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marked_board_win(B) :-
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transpose(B, T),
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(rows_win(B); rows_win(T)).
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unmarked_row_sum([], [], 0).
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unmarked_row_sum([_|As], [1|Ms], C) :-
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unmarked_row_sum(As, Ms, C).
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unmarked_row_sum([A|As], [0|Ms], C) :-
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unmarked_row_sum(As, Ms, C1),
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C is A + C1.
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unmarked_board_sum([], [], 0).
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unmarked_board_sum([A|As], [B|Bs], C) :-
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unmarked_row_sum(A, B, C1),
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unmarked_board_sum(As, Bs, C2),
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C is C1 + C2.
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last_num([R], R).
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last_num([_|Rs], X) :-
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last_num(Rs, X).
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board_win(N, B, X) :-
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mark_nums_board(N, B, C),
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marked_board_win(C),
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unmarked_board_sum(B, C, Z),
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last_num(N, Y),
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X is Y * Z.
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first_board_win(N, [B|_], C) :-
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board_win(N, B, C).
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first_board_win(N, [B|Bs], C) :-
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\+ board_win(N, B, _),
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first_board_win(N, Bs, C).
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step_first_board_win([A|As], [], B, C) :-
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step_first_board_win(As, [A], B, C).
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step_first_board_win([_|_], [N|Ns], B, C) :-
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first_board_win([N|Ns], B, C).
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step_first_board_win([A|As], [N|Ns], B, C) :-
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\+ first_board_win([N|Ns], B, _),
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append([N|Ns], [A], D),
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step_first_board_win(As, D, B, C).
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step_first_board_win([], N, B, C) :-
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first_board_win(N, B, C).
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step_first_board_win(N, B, C) :-
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step_first_board_win(N, [], B, C).
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