commit 95accd44e0c22624d279fa1ef155f93460230761
parent 5523e6dd2ef81bc0c640df1bc6089e6ac3d1d2ea
Author: Lukas Henkel <lh@entf.net>
Date: Tue, 13 Dec 2022 22:34:15 +0100
Day 13 task 1
Diffstat:
4 files changed, 561 insertions(+), 3 deletions(-)
diff --git a/adventofcode2022.asd b/adventofcode2022.asd
@@ -5,7 +5,11 @@
:licence "AGPLv3"
:serial t
:pathname "src"
- :depends-on ("trivia" "str" "queues" "queues.simple-queue")
+ :depends-on ("trivia"
+ "str"
+ "queues"
+ "queues.simple-queue"
+ "binding-arrows")
:components ((:file "main")
(:file "day01")
(:file "day02")
@@ -18,7 +22,8 @@
(:file "day09")
(:file "day10")
(:file "day11")
- (:file "day12")))
+ (:file "day12")
+ (:file "day13")))
(defsystem "adventofcode2022/test"
:description "My solutions to the advent of code 2022"
@@ -40,4 +45,5 @@
(:file "day09")
(:file "day10")
(:file "day11")
- (:file "day12")))
+ (:file "day12")
+ (:file "day13")))
diff --git a/input/day13.txt b/input/day13.txt
@@ -0,0 +1,449 @@
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+[[9,[9,8,[],[6,0,5],3],7],[10,5,5],[6,1,3,[8,0,2],2],[[[4,0,6]],[8,0],6,[[]]]]
+
+[[8],[]]
+[[3],[0,7,[[6,0,0,10],9,[],9,2]],[[10,3,7,[6]]]]
diff --git a/src/day13.lisp b/src/day13.lisp
@@ -0,0 +1,54 @@
+(defpackage #:adventofcode2022/day13
+ (:use #:cl #:adventofcode2022 #:binding-arrows))
+(in-package #:adventofcode2022/day13)
+
+(defun compare-lists (a b)
+ (declare (optimize (debug 3)))
+ (cond
+ ((and (null a) (null b))
+ :continue)
+ ((null a)
+ t)
+ ((null b)
+ nil)
+ ((and (vectorp a) (not (vectorp b)))
+ (compare-lists a (vector b)))
+ ((and (not (vectorp a)) (vectorp b))
+ (compare-lists (vector a) b))
+ ((and (numberp a) (numberp b))
+ (if (= a b)
+ :continue
+ (< a b)))
+ (t (loop for ia from 0
+ for ib from 0
+ for va = (if (< ia (length a)) (aref a ia) nil)
+ for vb = (if (< ib (length b)) (aref b ib) nil)
+ for res = (compare-lists va vb)
+ when (not (eq res :continue))
+ return res
+ end
+ when (and (null va) (null vb))
+ return :continue
+ end
+ finally (return t)))))
+
+(defun task1 (inputs)
+ (loop with inputs = (remove-if #'null inputs)
+ for a = (pop inputs)
+ for b = (pop inputs)
+ for i from 1
+ while a
+ when (compare-lists a b)
+ sum i))
+
+(define-day 13
+ (:translate-input (lambda (line)
+ (if (= (length line) 0)
+ nil
+ (->> line
+ (str:replace-all "[" "#(")
+ (str:replace-all "]" ")")
+ (str:replace-all "," " ")
+ (read-from-string)))))
+ #'task1
+ nil)
diff --git a/t/day13.lisp b/t/day13.lisp
@@ -0,0 +1,49 @@
+(in-package #:adventofcode2022/test)
+
+(defconstant +testdata-day13+ "[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]")
+
+(def-test day13-compare-lists ()
+ (is-true (adventofcode2022/day13::compare-lists
+ #(1 1 3 1 1)
+ #(1 1 5 1 1)))
+ (is-true (not (adventofcode2022/day13::compare-lists
+ #(#(#() #(3 2 10)))
+ #(#(#() 2 #() 1 #(4 1)) #(3 #(#(8 4 0 7 8) 4 2))
+ #(#(9 #(2 1 8 2) #(6 0 3 1 1)) 4) #(10 2 2)))))
+ (is-true (adventofcode2022/day13::compare-lists
+ #(#() #(#(0 2 #(8) #(10 7) #(2 8 9 6)) 2 9 7) #(#(#()))
+ #(10 4 0 #(8 #(10 7 0 3) #(6 5) #(4 1 2 4)))
+ #(10 4 #(7 5 #(10 4) 5) #(#(6 4 0) 7) 7))
+ #(#() #(7 #(#(7 6)))
+ #(8 #(10 #(2 6) #(9 7 0 5 10))
+ #(#(8)))
+ #(#(#() 9 0 #(3 5 8) 9) 5)
+ #(2 9)))))
+
+(def-test day13-task1 ()
+ (is-true
+ (= 13
+ (run-task 13 1
+ (make-string-input-stream +testdata-day13+)))))
