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authorH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
committerH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
commit8777ff071f7bb37631baa7b6717ad29961e50911 (patch)
tree6d59c4ed58e454b960339c3d1151f0a879e8d7cb /aoc2022/day-14/day-14.rkt
parent6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff)
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-rw-r--r--aoc2022/day-14/day-14.rkt51
1 files changed, 0 insertions, 51 deletions
diff --git a/aoc2022/day-14/day-14.rkt b/aoc2022/day-14/day-14.rkt
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--- a/aoc2022/day-14/day-14.rkt
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@@ -1,51 +0,0 @@
-#lang racket
-
-(require advent-of-code
- threading
- algorithms)
-
-(define data (fetch-aoc-input (find-session) 2022 14 #:cache #true))
-
-(define (trace-line-between-points p1 p2)
- (match* (p1 p2)
- [((list x y1) (list x y2)) (map (λ (y) (cons x y)) (inclusive-range (min y1 y2) (max y1 y2)))]
- [((list x1 y) (list x2 y)) (map (λ (x) (cons x y)) (inclusive-range (min x1 x2) (max x1 x2)))]))
-
-(define (find-points-in-structure str)
- (define endpoints
- (for/list ([coord-pair (in-list (string-split str " -> "))])
- (for/list ([coord (in-list (string-split coord-pair ","))])
- (string->number coord))))
- (~>> endpoints (adjacent-map trace-line-between-points) (apply append) (list->set)))
-
-(define blocked-locations
- (~> data (string-split "\n") (map find-points-in-structure _) (apply set-union _)))
-
-(define max-vertical-distance (~>> blocked-locations (set->list) (argmax cdr) cdr add1))
-
-(define (open? pts p)
- (not (set-member? pts p)))
-
-;; part 1
-(define (trace-grain pts path #:at-limit do-at-limit)
- (match-define (list* (and p (cons x y)) _) path)
- (match-define (list dest-1 dest-2 dest-3) (map (λ (d) (cons (+ x d) (add1 y))) '(0 -1 1)))
- (cond
- [(>= y max-vertical-distance) (values (do-at-limit pts p) path)]
- [(open? pts dest-1) (trace-grain pts (cons dest-1 path) #:at-limit do-at-limit)]
- [(open? pts dest-2) (trace-grain pts (cons dest-2 path) #:at-limit do-at-limit)]
- [(open? pts dest-3) (trace-grain pts (cons dest-3 path) #:at-limit do-at-limit)]
- [else (values (set-add pts (car path)) path)]))
-
-(time (for/fold ([pts blocked-locations] [path (list (cons 500 0))] [grains 0] #:result grains)
- ([_ (in-naturals 1)])
- (define-values (pts* path*) (trace-grain pts path #:at-limit (const 'break)))
- #:break (equal? pts* 'break)
- (values pts* (cdr path*) (add1 grains))))
-
-;; part 2
-(time (for/fold ([pts blocked-locations] [path (list (cons 500 0))] [grains 0] #:result grains)
- ([_ (in-naturals 1)])
- #:break (not (open? pts (cons 500 0)))
- (define-values (pts* path*) (trace-grain pts path #:at-limit set-add))
- (values pts* (cdr path*) (add1 grains))))