From d8d4346d392acbc148cb564f021cc77363638441 Mon Sep 17 00:00:00 2001
From: rhiannon morris <rhi@rhiannon.website>
Date: Thu, 7 Dec 2023 19:00:36 +0100
Subject: [PATCH] day7.1

---
 day7.pl | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 day7.pl

diff --git a/day7.pl b/day7.pl
new file mode 100644
index 0000000..4b595de
--- /dev/null
+++ b/day7.pl
@@ -0,0 +1,71 @@
+:- use_module(library(dcg/basics)).
+:- use_module(library(pio)).
+
+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).
+
+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).
+
+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).
+
+
+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).
+
+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]}.
+bid(N)        --> digits(Ds), {number_chars(N, Ds)}.
+spaces        --> " ", (spaces ; []).
+line(Cs-B)    --> cards(Cs), spaces, bid(B).
+lines([])     --> "\n" ; [].
+lines([L|Ls]) --> line(L), "\n", lines(Ls).
+
+
+part1(File) :-
+  phrase_from_file(lines(Ls), File),
+  % length(Ls, N), writeln(N),
+  predsort(compare_hand, Ls, Sorted),
+  total(Sorted, R),
+  writeln(R), !.
+
+
+% vim: set ft=prolog :