commit f79571f7ca069e3ac1deb706941bfd32e705a34f
parent 569b1ebc8e00e62547e3ab388d3668368f86823c
Author: Lukas Henkel <lh@entf.net>
Date: Fri, 22 Dec 2023 15:59:27 +0100
Day 22 task 1
Diffstat:
| A | input/22.txt | | | 1280 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/day-22.lisp | | | 111 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | t/day-22.lisp | | | 15 | +++++++++++++++ |
3 files changed, 1406 insertions(+), 0 deletions(-)
diff --git a/input/22.txt b/input/22.txt
@@ -0,0 +1,1280 @@
+7,0,231~7,2,231
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+4,0,101~6,0,101
+5,4,301~7,4,301
+2,4,174~4,4,174
+5,0,176~7,0,176
+0,7,294~0,9,294
+1,2,138~1,4,138
+0,5,80~0,7,80
+1,2,311~3,2,311
+0,4,98~0,7,98
+0,0,44~2,0,44
+2,1,283~2,2,283
+2,8,66~5,8,66
+5,0,3~5,2,3
+7,5,121~7,8,121
+9,3,100~9,5,100
+7,0,68~8,0,68
+3,6,251~4,6,251
+1,3,143~1,6,143
+6,5,258~7,5,258
+4,0,236~7,0,236
+4,6,81~7,6,81
+1,4,201~1,8,201
+4,7,179~6,7,179
+1,5,271~4,5,271
+9,1,44~9,1,46
+2,1,239~5,1,239
+3,6,111~5,6,111
+7,6,74~7,8,74
+0,2,181~0,3,181
+7,3,152~9,3,152
+6,0,143~6,2,143
+2,2,91~2,4,91
+8,5,30~9,5,30
+1,1,191~1,3,191
+2,5,28~5,5,28
+5,3,302~5,6,302
+9,1,245~9,3,245
+8,2,98~8,4,98
+7,3,227~7,4,227
+2,6,114~3,6,114
+4,0,173~7,0,173
+4,8,87~6,8,87
+0,5,94~0,5,96
+3,4,97~3,6,97
+6,5,2~6,5,5
+0,8,268~3,8,268
+1,0,304~1,1,304
+5,7,157~8,7,157
+2,3,186~5,3,186
+4,0,40~4,0,40
+0,5,270~0,8,270
+1,2,56~5,2,56
+1,5,59~1,7,59
+6,4,216~6,4,218
+4,0,251~7,0,251
+2,3,81~2,5,81
+1,1,193~1,1,193
+3,5,208~5,5,208
+3,3,210~4,3,210
+6,0,145~7,0,145
+6,4,68~9,4,68
+8,7,102~8,9,102
+7,4,267~8,4,267
+2,2,144~2,4,144
+3,1,127~3,3,127
+5,4,256~5,5,256
+8,8,210~8,9,210
+3,6,172~3,9,172
+1,6,239~4,6,239
+4,5,168~4,8,168
+0,0,280~4,0,280
+3,9,293~5,9,293
+3,0,81~5,0,81
+7,8,220~7,8,222
+4,3,132~4,6,132
+8,0,172~8,1,172
+5,9,203~8,9,203
+1,5,246~3,5,246
+0,8,88~4,8,88
+8,3,140~8,6,140
+2,1,219~2,4,219
+2,7,195~4,7,195
+6,3,273~8,3,273
+2,1,236~4,1,236
+6,5,289~6,7,289
+0,3,222~0,5,222
+5,3,170~5,3,170
+4,5,235~7,5,235
+1,8,3~1,8,5
+3,4,184~3,4,186
+3,4,278~3,6,278
+9,2,47~9,2,49
+2,3,215~2,5,215
+5,2,8~8,2,8
+2,4,22~2,4,25
+9,1,208~9,4,208
+0,3,11~2,3,11
+3,1,313~3,1,315
+6,0,58~6,1,58
+6,3,12~9,3,12
+6,8,224~9,8,224
+5,6,101~7,6,101
+0,2,317~1,2,317
+9,7,303~9,9,303
+1,1,109~1,2,109
+4,0,179~6,0,179
+7,5,57~7,8,57
+4,4,293~4,6,293
+1,8,12~3,8,12
+3,7,278~3,9,278
+0,1,231~0,3,231
+7,0,308~7,1,308
+6,1,267~6,4,267
+4,3,156~4,6,156
+7,1,179~9,1,179
+4,1,154~6,1,154
+1,8,18~2,8,18
+9,2,17~9,4,17
+8,3,94~8,5,94
+7,7,27~9,7,27
+2,3,27~2,6,27
+0,2,139~1,2,139
+0,3,323~2,3,323
+0,7,140~2,7,140
+7,0,27~7,2,27
+7,0,146~9,0,146
+5,1,65~5,4,65
+5,0,249~5,3,249
+9,5,109~9,7,109
+7,5,144~7,8,144
+7,3,199~7,4,199
diff --git a/src/day-22.lisp b/src/day-22.lisp
@@ -0,0 +1,111 @@
+(defpackage #:aoc/day-22
+ (:use #:cl #:aoc/utils)
+ (:export #:day-22))
+(in-package #:aoc/day-22)
+
+(defclass sand-block ()
+ ((p-1
+ :initarg :p-1
+ :reader sand-block-p-1)
+ (p-2
+ :initarg :p-2
+ :reader sand-block-p-2)))
+
+(defun make-sand-block (p-1 p-2)
+ (make-instance 'sand-block :p-1 p-1 :p-2 p-2))
+
+(defmethod print-object ((block sand-block) stream)
+ (print-unreadable-object (block stream :type t)
+ (with-slots (p-1 p-2)
+ block
+ (format stream "~A ~A" p-1 p-2))))
+
+(defmethod sand-block-bottom-z ((block sand-block))
+ (with-slots (p-1)
+ block
+ (third p-1)))
+
+(defmethod (setf sand-block-bottom-z) (new-z (block sand-block))
+ (with-slots (p-1)
+ block
+ (setf (third p-1) new-z)))
+
+(defmethod sand-block-top-z ((block sand-block))
+ (with-slots (p-2)
+ block
+ (third p-2)))
+
+(defmethod (setf sand-block-top-z) (new-z (block sand-block))
+ (with-slots (p-2)
+ block
+ (setf (third p-2) new-z)))
+
+(defun parse-line (line)
+ (loop with p-1 = (list 0 0 0)
+ with p-2 = (list 0 0 0)
+ for current-index in (list 0 1 2
+ 0 1 2)
+ for obj in (list p-1 p-1 p-1
+ p-2 p-2 p-2)
+ for pos from 0 below (length line)
+ do (multiple-value-bind (n end)
+ (parse-integer line :start pos :junk-allowed t)
+ (setf (nth current-index obj) n)
+ (setf pos end))
+ finally (return (make-sand-block p-1 p-2))))
+
+(defun parse-input (input)
+ (loop for line = (read-line input nil)
+ while line
+ collect (parse-line line)))
+
+(defun collides-p (block-1 block-2)
+ (labels ((intersects-p (from-1 to-1 from-2 to-2)
+ (and (<= from-1 to-2)
+ (<= from-2 to-1))))
+ (let ((b1-p1 (sand-block-p-1 block-1))
+ (b1-p2 (sand-block-p-2 block-1))
+ (b2-p1 (sand-block-p-1 block-2))
+ (b2-p2 (sand-block-p-2 block-2)))
+ (and (intersects-p (first b1-p1) (first b1-p2) (first b2-p1) (first b2-p2))
+ (intersects-p (second b1-p1) (second b1-p2) (second b2-p1) (second b2-p2))))))
+
+(defun find-collision (block others)
+ (first (sort (loop for other in others
+ when (collides-p block other)
+ collect other)
+ #'>
+ :key #'sand-block-top-z)))
+
+(defun apply-gravity (blocks)
+ (loop for i from 0
+ for block in blocks
+ for others = (nreverse (subseq blocks 0 i))
+ for collision = (find-collision block others)
+ for new-z = (or (and collision
+ (1+ (sand-block-top-z collision)))
+ 1)
+ do (decf (sand-block-top-z block)
+ (- (sand-block-bottom-z block) new-z))
+ do (setf (sand-block-bottom-z block) new-z)
+ finally (return blocks)))
+
+(defun task-1 (blocks)
+ (loop with safe-to-disintegrate = (make-hash-table)
+ for (block . others) on blocks
+ for resting-z = (1- (sand-block-bottom-z block))
+ for resting-on = (loop for other in others
+ when (and (= (sand-block-top-z other) resting-z)
+ (collides-p block other))
+ collect other)
+ when (= (length resting-on) 1)
+ do (setf (gethash (first resting-on) safe-to-disintegrate) t)
+ finally (return (loop for block in blocks
+ when (not (gethash block safe-to-disintegrate))
+ sum 1))))
+
+(defun day-22 (input)
+ (let* ((blocks (parse-input input))
+ (blocks (sort blocks #'< :key #'sand-block-bottom-z))
+ (blocks (apply-gravity blocks)))
+ (task-1 (nreverse blocks))))
diff --git a/t/day-22.lisp b/t/day-22.lisp
@@ -0,0 +1,15 @@
+(defpackage #:aoc-test/day-22
+ (:use #:cl #:lisp-unit2))
+(in-package #:aoc-test/day-22)
+
+(define-test test-day-22
+ ()
+ (multiple-value-bind (task-1)
+ (aoc:run-day 22 "1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9")
+ (assert= 5 task-1)))
