1 files changed, 0 insertions, 57 deletions
diff --git a/2022/day-18/day-18.rkt b/2022/day-18/day-18.rkt
deleted file mode 100644
index 157784d..0000000
--- a/2022/day-18/day-18.rkt
+++ /dev/null
@@ -1,57 +0,0 @@
-#lang racket
-
-(require advent-of-code
-         relation
-         threading
-         graph)
-
-(define positions (~> (fetch-aoc-input (find-session) 2022 18 #:cache #true) (string-split "\n")))
-
-(struct posn (x y z) #:transparent)
-
-(define cubes
-  (for/list ([cube (in-list positions)])
-    (match (string-split cube ",")
-      [(list (app ->number x) (app ->number y) (app ->number z)) (posn x y z)])))
-
-(define cubes-set (list->set cubes))
-
-(define (neighbors p)
-  (match-define (posn x y z) p)
-  (for*/list ([dx '(-1 0 1)]
-              [dy '(-1 0 1)]
-              [dz '(-1 0 1)]
-              #:when (= 1 (+ (abs dx) (abs dy) (abs dz))))
-    (posn (+ x dx) (+ y dy) (+ z dz))))
-
-;; part 1
-
-(for*/sum ([cube (in-set cubes-set)]
-           [neighbor (in-list (neighbors cube))]
-           #:unless (set-member? cubes-set neighbor))
-  1)
-
-;; part 2
-(define max-x (~> cubes (apply max _ #:key posn-x) posn-x (+ 2)))
-(define max-y (~> cubes (apply max _ #:key posn-y) posn-y (+ 2)))
-(define max-z (~> cubes (apply max _ #:key posn-z) posn-z (+ 2)))
-
-(define air-set
-  (for*/set ([x (in-inclusive-range -1 max-x)]
-             [y (in-inclusive-range -1 max-y)]
-             [z (in-inclusive-range -1 max-z)]
-             #:do [(define p (posn x y z))]
-             #:unless (set-member? cubes-set p))
-    p))
-
-(define air-graph
-  (for*/lists (ps #:result (undirected-graph ps))
-              ([a (in-set air-set)]
-               [neighbor (in-list (neighbors a))]
-               #:when (set-member? air-set neighbor))
-    (list a neighbor)))
-
-(for*/sum ([air (in-set (~> air-graph cc (sort > #:key length _) car))]
-           [neighbor (in-list (neighbors air))]
-           #:when (set-member? cubes-set neighbor))
-  1)