rhi
/
aoc2023
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

day7.2

This commit is contained in:
rhiannon morris 2023-12-07 19:40:06 +01:00
parent d8d4346d39
commit ed05bffe65
1 changed files with 50 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
day7.pl
View File

@ -1,55 +1,51 @@
:- use_module(library(dcg/basics)).
:- use_module(library(pio)).
sorted_hand([X,X,X,X,X], five) :- !.
sorted_hand([X,X,X,X|_], four) :- !.
% 0 for the joker. the other clauses are just the hand shapes
% sorry about all the cuts
sorted_hand([0|Rest], H) :- sorted_hand(Rest, H0), promote(H0, H), !.
sorted_hand([X,X,X,X,X], five) :- !.
sorted_hand([X,X,X,X|_], four) :- !.
sorted_hand([X,X,X,Y,Y], full_house) :- !.
sorted_hand([X,X,Y,Y,Y], full_house) :- !.
sorted_hand([X,X,X|_], three) :- !.
sorted_hand([X,X|Rest], two_pairs) :- sorted_hand(Rest, pair), !.
sorted_hand([X,X|_], pair) :- !.
sorted_hand([_|Rest], H) :- sorted_hand(Rest, H), !.
sorted_hand(_, junk).
sorted_hand([X,X,X|_], three) :- !.
sorted_hand([X,X|Rest], two_pairs) :- sorted_hand(Rest, pair), !.
sorted_hand([X,X|_], pair) :- !.
sorted_hand([_|Rest], H) :- sorted_hand(Rest, H), !.
sorted_hand([], junk).
hand(Cards, H) :-
msort(Cards, S),
sorted_hand(S, H).
promote(junk, pair).
promote(pair, three).
promote(two_pairs, full_house).
promote(three, four).
promote(four, five).
rank(junk, 0).
rank(pair, 1).
rank(two_pairs, 2).
rank(three, 3).
hand(Cards, H) :- msort(Cards, S), sorted_hand(S, H).
rank(junk, 0).
rank(pair, 1).
rank(two_pairs, 2).
rank(three, 3).
rank(full_house, 4).
rank(four, 5). % lol
rank(five, 6).
rank(four, 5). % lol
rank(five, 6).
hand_rank(C, R) :- hand(C, H), rank(H, R).
compare_rank(X, C1, C2) :- hand_rank(C1, R1), hand_rank(C2, R2), compare(X, R1, R2).
compare_hand(X, C1-_, C2-_) :- compare_rank(X, C1, C2), X \= (=).
compare_hand(X, C1-_, C2-_) :- compare_rank(=, C1, C2), compare(X, C1, C2).
compare_hand(X, C1-_, C2-_) :-
compare_rank(X0, C1, C2),
(X0 = (=) -> compare(X, C1, C2) ; X = X0).
total(Xs, R) :- total(1, Xs, R).
total(_, [], 0).
total(I, [_-X|Xs], R) :-
I1 is I + 1,
total(I1, Xs, R0),
R is R0 + (I * X).
total(Xs, R) :- total(1, Xs, R).
value(C, N) :-
char_code(C, N0),
char_code('0', Z),
N is N0 - Z,
N >= 0, N =< 9.
value('T', 10).
value('J', 11).
value('Q', 12).
value('K', 13).
value('A', 14).
:- use_module(library(dcg/basics)).
card(V) --> [X], {char_code(C, X), value(C, V)}.
cards(Cs) --> card(A), card(B), card(C), card(D), card(E), {Cs = [A,B,C,D,E]}.
@ -59,13 +55,33 @@ line(Cs-B) --> cards(Cs), spaces, bid(B).
lines([]) --> "\n" ; [].
lines([L|Ls]) --> line(L), "\n", lines(Ls).
value('T', 10).
value('J', 11).
value('Q', 12).
value('K', 13).
value('A', 14).
value(C, N) :- char_code(C, N0), N is N0 - 0x30, N >= 0, N =< 9.
part1(File) :-
phrase_from_file(lines(Ls), File),
% length(Ls, N), writeln(N),
predsort(compare_hand, Ls, Sorted),
total(Sorted, R),
writeln(R), !.
joker(11, 0).
joker(X, X) :- X \= 11.
part1_to_part2(Xs-B, Ys-B) :- maplist(joker, Xs, Ys).
with_hand(Xs-B, H-Xs-B) :- hand(Xs, H).
part2(File) :-
phrase_from_file(lines(Ls0), File),
maplist(part1_to_part2, Ls0, Ls),
predsort(compare_hand, Ls, Sorted),
total(Sorted, R),
writeln(R), !.
% vim: set ft=prolog :
% vim what the fuck is "gringo"