1 files changed, 0 insertions, 43 deletions
diff --git a/2021/day-17/day-17.rkt b/2021/day-17/day-17.rkt
deleted file mode 100644
index 7de44a0..0000000
--- a/2021/day-17/day-17.rkt
+++ /dev/null
@@ -1,43 +0,0 @@
-#lang racket
-(require "../../jj-aoc.rkt"
-         threading)
-
-(define-values (x-min x-max y-min y-max)
-  (~> (open-day 17 2021)
-      port->string
-      (regexp-match #px"target area: x=(.*)\\.\\.(.*), y=(.*)\\.\\.(.*)\n" _)
-      rest
-      (map string->number _)
-      (apply values _)))
-
-(define (hit? x y)
-  (and (x . >= . x-min) (x . <= . x-max) (y . >= . y-min) (y . <= . y-max)))
-
-(define (miss? x y)
-  (or (y . < . y-min) (x . > . x-max)))
-
-(define (drag dx i)
-  (max (- dx i) 0))
-(define (gravity dy i)
-  (- dy i))
-
-(define (find-trajectory-apex dx dy)
-  (for/fold ([x 0] [y 0] [y-apex 0] [result #f] #:result (list y-apex result))
-            ([i (in-naturals)] #:break result)
-    (cond
-      [(hit? x y) (values dx dy y-apex 'hit)]
-      [(miss? x y) (values x y 'miss 'miss)]
-      [else (values (+ x (drag dx i)) (+ y (gravity dy i)) (if (y . > . y-apex) y y-apex) #f)])))
-
-(define on-target
-  (for*/list ([dx (in-inclusive-range 1 x-max)]
-              [dy (in-inclusive-range y-min (abs (* 2 y-max)))]
-              [velocity (in-value (find-trajectory-apex dx dy))]
-              #:when (equal? (second velocity) 'hit))
-    (list dx dy (first velocity))))
-
-;; part 1
-(~>> on-target (argmax third) third)
-
-;; part 2
-(length on-target)