93 lines
2.5 KiB
Perl
93 lines
2.5 KiB
Perl
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remove_last(A, C) :-
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reverse(A, [_|B]),
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reverse(B, C).
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strings_chars([], []).
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strings_chars([A|As], [B|Bs]) :-
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string_chars(A, B),
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strings_chars(As, Bs).
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read_file(Stream, []) :-
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at_end_of_stream(Stream).
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read_file(Stream, [X|Xs]) :-
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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, "|", "", [A, B]),
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split_string(A, " ", "", A0),
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split_string(B, " ", "", [_|B0]),
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remove_last(A0, A1),
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strings_chars(A1, A2),
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strings_chars(B0, B1),
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X = [A2, B1],
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% X = S,
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read_file(Stream, Xs).
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main :-
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open('../input/08', read, Stream),
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read_file(Stream, Lines), !,
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close(Stream),
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solve_all(Lines, Ans),
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print(Ans).
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solve_all([], 0).
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solve_all([L|Ls], S) :-
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solve(L, A),
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solve_all(Ls, S0),
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S is S0 + A.
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dig_dec(A, N) :-
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dig_dec(A, 0, N).
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dig_dec([], N, N).
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dig_dec([A|As], N, C) :-
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C0 is N * 10 + A,
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dig_dec(As, C0, C).
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letter(a).
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letter(b).
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letter(c).
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letter(d).
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letter(e).
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letter(f).
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letter(g).
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solve([Q, W], X) :-
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letter(A), letter(B), letter(C), letter(D), letter(E), letter(F), letter(G),
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A \= B, A \= C, A \= D, A \= E, A \= F, A \= G,
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B \= C, B \= D, B \= E, B \= F, B \= G,
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C \= D, C \= E, C \= F, C \= G,
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D \= E, D \= F, D \= G,
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E \= F, E \= G,
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F \= G,
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length(A1, 2), length(A7, 3), length(A4, 4), length(A2, 5), length(A3, 5), length(A5, 5), length(A0, 6), length(A6, 6), length(A9, 6), length(A8, 7),
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permutation([A0, A1, A2, A3, A4, A5, A6, A7, A8, A9], Q),
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permutation([C, F], A1),
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permutation([A, C, F], A7),
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permutation([B, C, D, F], A4),
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permutation([A, B, C, D, E, F, G], A8),
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permutation([A, B, D, F, G], A5),
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permutation([A, C, D, F, G], A3),
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permutation([A, C, D, E, G], A2),
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permutation([A, B, C, E, F, G], A0),
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permutation([A, B, D, E, F, G], A6),
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permutation([A, B, C, D, F, G], A9), !,
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decode_all(W, Y, [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9]),
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dig_dec(Y, X).
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decode_all([], [], _).
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decode_all([Q|Qs], [W|Ws], A) :-
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decode(Q, W, A),
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decode_all(Qs, Ws, A).
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decode(Q, W, [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9]) :-
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((permutation(A0, Q), W is 0);
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(permutation(A1, Q), W is 1);
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(permutation(A2, Q), W is 2);
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(permutation(A3, Q), W is 3);
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(permutation(A4, Q), W is 4);
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(permutation(A5, Q), W is 5);
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(permutation(A6, Q), W is 6);
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(permutation(A7, Q), W is 7);
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(permutation(A8, Q), W is 8);
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(permutation(A9, Q), W is 9)), !.
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