2 files changed, 1080 insertions, 0 deletions
diff --git a/AoC2023/day07/input b/AoC2023/day07/input
new file mode 100644
index 0000000..7d03f8f
--- /dev/null
+++ b/AoC2023/day07/input
@@ -0,0 +1,1000 @@
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diff --git a/AoC2023/day07/solver.lisp b/AoC2023/day07/solver.lisp
new file mode 100644
index 0000000..3a1fe8a
--- /dev/null
+++ b/AoC2023/day07/solver.lisp
@@ -0,0 +1,80 @@
+(ql:quickload '(fiveam arrows trivia str))
+(defpackage #:day07
+  (:use #:cl)
+  (:local-nicknames (#:f #:fiveam)))
+
+(in-package :day07)
+
+(defparameter eg-input "32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483")
+
+(defun occurences (str)
+  (let ((bag (make-hash-table)))
+    (loop
+      for le across str
+      do (incf (gethash le bag 0)))
+    (sort (alexandria:hash-table-values bag) #'>)))
+
+(defun hand-type (str)
+  (trivia:match (occurences str)
+    ((list 5) 5)
+    ((list 4 1) 4)
+    ((list 3 2) 3)
+    ((list 3 1 1) 2)
+    ((list 2 2 1) 1)
+    ((list 2 1 1 1) 0)
+    ((list 1 1 1 1 1) -1)))
+
+(defun card-strength (card)
+  (position card "23456789TJQKA"))
+
+(defun card-< (a b)
+  (< (card-strength a) (card-strength b)))
+
+(defun hand-< (a b)
+  (let ((a-t (hand-type a))
+        (b-t (hand-type b)))
+    (cond
+      ((< a-t b-t))
+      ((= a-t b-t)
+       (loop for l across a
+             for s across b
+             unless (eq l s)
+               return (card-< l s))))))
+
+(f:test partial
+  (f:is
+   (equal '(3 1 1)
+          (occurences "QJQAQ")))
+  (f:is (hand-< "2AAAA" "33332"))
+  (f:is (hand-< "77788" "77888"))
+  (f:is (hand-< "77788" "77778")))
+
+(defun parse-input (str)
+  (let ((data (arrows:->>
+               (ppcre:split "\\s" str)
+               (remove-if #'str:empty?))))
+    (loop for (hand bid) on data by #'cddr
+          collect (cons hand (parse-integer bid)))))
+
+(defun total-win (sorted-hands)
+  (loop for (hand . bid) in sorted-hands
+        for c from 1
+        sum (* c bid)))
+
+(defun solver1 (lines)
+  (arrows:->
+   (parse-input lines)
+   (sort #'hand-< :key #'car)
+   (total-win)))
+(f:test solutions
+  (f:is
+   (= 6440
+      (solver1 eg-input)))
+  (f:is
+   (= 253205868
+      (solver1
+       (uiop:read-file-string "input")))))