1 files changed, 0 insertions, 41 deletions
diff --git a/aoc2023-racket/day-15/day-15.rkt b/aoc2023-racket/day-15/day-15.rkt
deleted file mode 100644
index d049565..0000000
--- a/aoc2023-racket/day-15/day-15.rkt
+++ /dev/null
@@ -1,41 +0,0 @@
-#lang racket
-
-(require advent-of-code
-         threading)
-
-(define input
-  (~> (fetch-aoc-input (find-session) 2023 15 #:cache #true) string-trim (string-split ",")))
-
-(define (hash-algorithm str)
-  (for/fold ([acc 0]) ([c (in-string str)])
-    (~> c char->integer (+ acc) (* 17) (modulo _ 256))))
-
-;; part 1
-(for/sum ([code (in-list input)]) (hash-algorithm code))
-
-;; part 2
-(define (remove-lens boxes label)
-  (hash-update boxes
-               (hash-algorithm label)
-               (λ (lens-set) (remove label lens-set (λ (rem l) (equal? rem (car l)))))
-               '()))
-
-(define (insert-lens boxes label focal)
-  (define new-lens (cons label focal))
-  (hash-update boxes
-               (hash-algorithm label)
-               (λ (lens-set)
-                 (if (assoc label lens-set)
-                     (map (λ (pair) (if (equal? (car pair) label) new-lens pair)) lens-set)
-                     (append lens-set (list new-lens))))
-               (list new-lens)))
-
-(define (focusing-power boxes)
-  (for*/sum ([(box-number lenses) (in-hash boxes)] [(lens order) (in-indexed lenses)])
-    (* (add1 box-number) (add1 order) (cdr lens))))
-
-(for/fold ([boxes (hash)] #:result (focusing-power boxes)) ([code (in-list input)])
-  (match code
-    [(regexp #rx"(.*)=(.*)" (list _ label (app string->number focal)))
-     (insert-lens boxes label focal)]
-    [(regexp #rx"(.*)-" (list _ label)) (remove-lens boxes label)]))