commit 4ee26699aff8490850abfcac0eb2c98203ba1f45
parent 52531e8425521cbc2d23fe5871045f138c6315d3
Author: Lukas Henkel <lh@entf.net>
Date: Wed, 14 Dec 2022 07:08:48 +0100
Day 14 task 1
Diffstat:
4 files changed, 240 insertions(+), 2 deletions(-)
diff --git a/adventofcode2022.asd b/adventofcode2022.asd
@@ -23,7 +23,8 @@
(:file "day10")
(:file "day11")
(:file "day12")
- (:file "day13")))
+ (:file "day13")
+ (:file "day14")))
(defsystem "adventofcode2022/test"
:description "My solutions to the advent of code 2022"
@@ -46,4 +47,5 @@
(:file "day10")
(:file "day11")
(:file "day12")
- (:file "day13")))
+ (:file "day13")
+ (:file "day14")))
diff --git a/input/day14.txt b/input/day14.txt
@@ -0,0 +1,149 @@
+475,52 -> 475,50 -> 475,52 -> 477,52 -> 477,46 -> 477,52 -> 479,52 -> 479,49 -> 479,52 -> 481,52 -> 481,49 -> 481,52 -> 483,52 -> 483,42 -> 483,52 -> 485,52 -> 485,47 -> 485,52
+410,118 -> 410,108 -> 410,118 -> 412,118 -> 412,114 -> 412,118 -> 414,118 -> 414,115 -> 414,118 -> 416,118 -> 416,108 -> 416,118 -> 418,118 -> 418,112 -> 418,118 -> 420,118 -> 420,116 -> 420,118 -> 422,118 -> 422,116 -> 422,118 -> 424,118 -> 424,108 -> 424,118
+410,118 -> 410,108 -> 410,118 -> 412,118 -> 412,114 -> 412,118 -> 414,118 -> 414,115 -> 414,118 -> 416,118 -> 416,108 -> 416,118 -> 418,118 -> 418,112 -> 418,118 -> 420,118 -> 420,116 -> 420,118 -> 422,118 -> 422,116 -> 422,118 -> 424,118 -> 424,108 -> 424,118
+494,23 -> 494,26 -> 486,26 -> 486,29 -> 502,29 -> 502,26 -> 496,26 -> 496,23
+456,66 -> 456,70 -> 455,70 -> 455,77 -> 466,77 -> 466,70 -> 462,70 -> 462,66
+446,83 -> 450,83
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+466,59 -> 470,59
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+449,79 -> 449,80 -> 463,80
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+449,85 -> 453,85
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+460,63 -> 464,63
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+484,63 -> 488,63
+497,13 -> 497,16 -> 496,16 -> 496,20 -> 508,20 -> 508,16 -> 503,16 -> 503,13
diff --git a/src/day14.lisp b/src/day14.lisp
@@ -0,0 +1,76 @@
+(defpackage #:adventofcode2022/day14
+ (:use #:cl #:adventofcode2022))
+(in-package #:adventofcode2022/day14)
+
+(defun make-map (inputs)
+ (loop with map = (make-hash-table :test 'equal)
+ with min-x = 500
+ with max-x = 500
+ with max-y = nil
+ for input in inputs
+ do (loop with last = (pop input)
+ for point in input
+ do (loop with axis = (if (= (car last) (car point)) #'cadr #'car)
+ with from = (funcall axis last)
+ with to = (funcall axis point)
+ with step-fun = (if (< from to) #'1+ #'1-)
+ for i = from then (funcall step-fun i)
+ for current-point = (if (eq axis #'car)
+ (list i (cadr last))
+ (list (car last) i))
+ when (or (null min-x) (< (car current-point) min-x))
+ do (setf min-x (car current-point))
+ when (or (null max-x) (> (car current-point) max-x))
+ do (setf max-x (car current-point))
+ when (or (null max-y) (> (cadr current-point) max-y))
+ do (setf max-y (cadr current-point))
+ do (setf (gethash current-point map) #\#)
+ while (not (= i to)))
+ do (setf last point))
+ finally (return (values map (list min-x 0) (list max-x max-y)))))
+
+(defun print-map (map min-point max-point)
+ (loop for y from (cadr min-point) to (cadr max-point)
+ do (loop for x from (car min-point) to (car max-point)
+ for cell = (gethash (list x y) map)
+ do (format t "~A" (if cell cell #\.)))
+ do (format t "~%")))
+
+(defun count-sand (map)
+ (loop for cell being the hash-value of map
+ when (char= cell #\o)
+ sum 1))
+
+(defun task1 (inputs)
+ (multiple-value-bind (map min-point max-point)
+ (make-map inputs)
+ (loop with x = 500
+ with y = 0
+ while (and (>= x (car min-point))
+ (<= x (car max-point))
+ (<= y (cadr max-point)))
+ for point = (list x y)
+ for down = (list x (1+ y))
+ for down-left = (list (1- x) (1+ y))
+ for down-right = (list (1+ x) (1+ y))
+ if (loop for next in (list down down-left down-right)
+ when (null (gethash next map))
+ do (setf x (car next))
+ and do (setf y (cadr next))
+ and do (return nil)
+ finally (return t))
+ do (setf x 500)
+ and do (setf y 0)
+ and do (setf (gethash point map) #\o)
+ ;;and do (print-map map min-point max-point)
+ )
+ (count-sand map)))
+
+(define-day 14
+ (:translate-input (lambda (line)
+ (mapcar (lambda (x)
+ (mapcar #'parse-integer
+ (uiop:split-string x :separator '(#\,))))
+ (str:split " -> " line))))
+ #'task1
+ nil)
diff --git a/t/day14.lisp b/t/day14.lisp
@@ -0,0 +1,11 @@
+(in-package #:adventofcode2022/test)
+
+(defconstant +testdata-day14+ "498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9")
+
+(def-test day14-task1 ()
+ (is-true
+ (= 24
+ (run-task 14 1
+ (make-string-input-stream +testdata-day14+)))))
+
