61 lines
2.1 KiB
Prolog
61 lines
2.1 KiB
Prolog
answer(Answer) :-
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input(Input),
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convert_input(Input, Hands, Bets),
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convlist(score, Hands, Scores),
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zip(Scores, Bets, ScoresBets),
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sort(ScoresBets, SortedScoreBetsInv),
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reverse(SortedScoreBetsInv, SortedScoreBets),
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payout(SortedScoreBets, _, Answer).
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% payout([Hand-Bet], _, Payout) computes total payout from [Hand-Bet] map.
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payout([], 0, 0).
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payout([_-Bet | Cdr], Rank, Payout) :-
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payout(Cdr, LastRank, LastPayout),
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Rank is LastRank + 1,
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Payout is LastPayout + Rank*Bet.
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% score(Hand, Score) gets the score for one hand, that can be directly compared.
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score([A, B, C, D, E], Score) :-
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type([A, B, C, D, E], Type),
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Score is E + 15*D + (15**2)*C + (15**3)*B + (15**4)*A + (15**5)*Type.
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% type(Hand, Type) get the type rank for one hand, ordered.
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type(Hand, Type) :- sort(0, @=<, Hand, Sorted), sorted_type(Sorted, Type).
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sorted_type([X, X, X, X, X], 7) :- !.
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sorted_type([X, X, X, X, _], 6) :- !.
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sorted_type([_, X, X, X, X], 6) :- !.
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sorted_type([Y, Y, X, X, X], 5) :- !.
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sorted_type([X, X, X, Y, Y], 5) :- !.
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sorted_type([X, X, X, _, _], 4) :- !.
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sorted_type([_, X, X, X, _], 4) :- !.
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sorted_type([_, _, X, X, X], 4) :- !.
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sorted_type([X, X, Y, Y, _], 3) :- !.
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sorted_type([X, X, _, Y, Y], 3) :- !.
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sorted_type([_, X, X, Y, Y], 3) :- !.
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sorted_type([X, X, _, _, _], 2) :- !.
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sorted_type([_, X, X, _, _], 2) :- !.
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sorted_type([_, _, X, X, _], 2) :- !.
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sorted_type([_, _, _, X, X], 2) :- !.
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sorted_type([_, _, _, _, _], 1).
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% convert_input(InputList, Cards, Bets)
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convert_input([], [], []).
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convert_input([[Cards, Bet] | Cdr],
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[[C1, C2, C3, C4, C5] | HandCdr],
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[Bet | BetCdr]) :-
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string_to_list(Cards, [A1, A2, A3, A4, A5]),
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card(A1, C1), card(A2, C2), card(A3, C3), card(A4, C4), card(A5, C5),
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convert_input(Cdr, HandCdr, BetCdr).
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% card(Ascii, Value) converts between card ascii value and internal values
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card(84, 10).
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card(74, 11).
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card(81, 12).
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card(75, 13).
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card(65, 14).
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card(Char, Card) :- Char >= 48, Char =< 57, Card is Char - 48.
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% zip 2 lists into a map
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zip([], [], []).
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zip([A | ACdr], [B | BCdr], [A-B | ABCdr]) :- zip(ACdr, BCdr, ABCdr).
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