From 9855cf3ac91351bf01d2cb535200a8992f4d4965 Mon Sep 17 00:00:00 2001
From: Peter Tillemans <pti@snamellit.com>
Date: Tue, 3 Dec 2024 08:13:45 +0100
Subject: [PATCH] solved day 3

---
 src/2024/day03.lisp         | 76 +++++++++++++++++++++++++++++++++++++
 tests/2024/day03-tests.lisp | 18 +++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 src/2024/day03.lisp
 create mode 100644 tests/2024/day03-tests.lisp

diff --git a/src/2024/day03.lisp b/src/2024/day03.lisp
new file mode 100644
index 0000000..f0d492c
--- /dev/null
+++ b/src/2024/day03.lisp
@@ -0,0 +1,76 @@
+(defpackage :aoc/2024/03
+  (:use :cl :aoc :alexandria)
+  (:export
+   #:sample-data
+   #:sample-data2
+   #:part1
+   #:part2
+   ))
+
+(in-package :aoc/2024/03)
+
+
+(defun parse-line (s)
+  (let ((multiplications '()))
+    (cl-ppcre:do-register-groups (a b c d)
+	("mul\\((\\d+),(\\d+)\\)|(do)\\(\\)|(don't)\\(\\)" s)
+      (push
+       (cond
+	 (a (list (parse-integer  a) (parse-integer b)))
+	 (c :do)
+	 (d :dont))
+       multiplications))
+    (reverse multiplications)))
+
+(defvar input-data '())
+(setf input-data (map 'list #'parse-line (test-input 2024 3)))
+
+(defvar sample-text "")
+(setf sample-text (aoc:split-lines "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"))
+
+(defvar sample-data '())
+(setf sample-data (map 'list #'parse-line sample-text))
+
+(defun add-multiply (data)
+  (first
+   (reduce
+    (lambda (acc x)
+      (let ((sum (first acc))
+	    (enable (second acc)))
+	(if (listp x)
+	    (list (+ sum  (if enable (* (first x) (second x)) 0)) enable)
+	    (list sum enable))))
+    data
+    :initial-value (list 0 t)
+    )))
+
+(defun part1 (data)
+  (format nil "~A" (add-multiply (reduce #'append data))))
+
+(defvar sample-text2 "")
+(setf sample-text2 (aoc:split-lines "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))"))
+
+(defvar sample-data2 '())
+(setf sample-data2 (map 'list #'parse-line sample-text2))
+
+(defun interprete (data)
+  (first
+   (reduce
+    (lambda (acc x)
+      (let ((sum (first acc))
+	    (enable (second acc)))
+	(cond
+	  ((eq x :do) (list sum t))
+	  ((eq x :dont) (list sum nil))
+	  ((listp x) (list (+ sum  (if enable (* (first x) (second x)) 0)) enable))
+	  (t (format nil "****ERROR**** Unexpected input: ~A~%" x)))))
+    data
+    :initial-value (list 0 t)
+    )))
+
+(defun part2 (data)
+  (format nil "~A" (interprete (reduce #'append data))))
+
+(defun solve-day ()
+  (format t "part1: ~A~%" (part1 input-data))
+  (format t "part2: ~A~%" (part2 input-data)))
diff --git a/tests/2024/day03-tests.lisp b/tests/2024/day03-tests.lisp
new file mode 100644
index 0000000..f350499
--- /dev/null
+++ b/tests/2024/day03-tests.lisp
@@ -0,0 +1,18 @@
+(defpackage :aoc/2024/03/tests
+  (:use :cl :aoc :aoc/tests :aoc/2024/tests :parachute :aoc/2024/03))
+
+(in-package :aoc/2024/03/tests)
+
+(define-test suite-2024-03
+					;:parent suite-2024
+  )
+
+(define-test+run test-part1
+  :parent suite-2024-03
+  (true (equalp "161" (part1 sample-data))))
+
+(define-test+run test-part2
+  :parent suite-2024-03
+  (true (equalp "48" (part2 sample-data2))))
+
+