commit f4702ab909eae61b66c4164fb82c26bdb4f78337
parent 5ebe82fbf80d12d57735a7ddd314db7ecc3e132f
Author: Lukas Henkel <lh@entf.net>
Date: Tue, 3 Dec 2024 06:13:33 +0100
Day 3
Diffstat:
3 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/input/3.txt b/input/3.txt
@@ -0,0 +1,6 @@
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diff --git a/src/day-3.lisp b/src/day-3.lisp
@@ -0,0 +1,23 @@
+(defpackage #:aoc/day-3
+ (:use #:cl #:aoc/utils)
+ (:export #:day-3))
+(in-package #:aoc/day-3)
+
+(defun day-3 (input)
+ (let ((input-string (read-stream-content-into-string input))
+ (mul-enabled t)
+ (task-1 0)
+ (task-2 0))
+ (ppcre:do-scans (start end reg-starts reg-ends "(mul\\(\\d+,\\d+\\))|((do|don't)\\(\\))" input-string)
+ (case (aref input-string start)
+ (#\d
+ (setf mul-enabled (char/= (aref input-string (+ start 2)) #\n)))
+ (#\m
+ (multiple-value-bind (num-1 end)
+ (parse-integer input-string :start (+ start 4) :junk-allowed t)
+ (let* ((num-2 (parse-integer input-string :start (1+ end) :junk-allowed t))
+ (result (* num-1 num-2)))
+ (incf task-1 result)
+ (when mul-enabled
+ (incf task-2 result)))))))
+ (values task-1 task-2)))
diff --git a/t/day-3.lisp b/t/day-3.lisp
@@ -0,0 +1,7 @@
+(defpackage #:aoc-test/day-3
+ (:use #:cl #:lisp-unit2))
+(in-package #:aoc-test/day-3)
+
+(define-test test-day-3
+ ()
+ )
+\ No newline at end of file
