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authorHunky Jimpjorps <thechairman@thechairman.info>2024-02-02 17:05:12 -0500
committerHunky Jimpjorps <thechairman@thechairman.info>2024-02-02 17:05:12 -0500
commit48e35ad3b0b0c62f936784e4aca70b17c3b0e3f9 (patch)
treef59a13e0b5e80ab925220b4488c6e36b1bec660a /aoc2023-other/day-02/day-02-parser.rkt
parent87e9ab25ff70e215b537939a4bc23ab101f41dbe (diff)
downloadgleam_aoc-48e35ad3b0b0c62f936784e4aca70b17c3b0e3f9.tar.gz
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diff --git a/aoc2023-other/day-02/day-02-parser.rkt b/aoc2023-other/day-02/day-02-parser.rkt
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-#lang racket
-
-(require racket/hash
- advent-of-code
- data/applicative
- data/either
- data/monad
- megaparsack
- megaparsack/text
- threading)
-
-(struct game (id r g b))
-
-(define cube/p
- (do [n <- integer/p]
- space/p
- [c <- (or/p (string/p "red")
- (string/p "blue")
- (string/p "green"))]
- (pure (cons c n))))
-
-(define draw/p
- (do [xs <- (many/p cube/p #:min 1 #:max 3 #:sep (string/p ", "))]
- (pure (apply hash (flatten xs)))))
-
-(define all-draws/p
- (do (string/p "Game ")
- [id <- integer/p]
- (string/p ": ")
- [all-draws <- (many/p draw/p #:min 1 #:sep (string/p "; "))]
- (define maxima
- (foldl (curry hash-union #:combine max)
- (hash "red" 0 "green" 0 "blue" 0)
- all-draws))
- (pure (game id
- (hash-ref maxima "red")
- (hash-ref maxima "green")
- (hash-ref maxima "blue")))))
-
-(define game-maxima
- (~>> (open-aoc-input (find-session) 2023 2)
- port->lines
- (map (λ~>> (parse-string all-draws/p)
- from-either))))
-
-;; part 1
-(for/sum ([m (in-list game-maxima)]
- #:unless (or (> (game-r m) 12)
- (> (game-g m) 13)
- (> (game-b m) 14)))
- (game-id m))
-
-;; part 2
-(for/sum ([m (in-list game-maxima)])
- (* (game-r m) (game-g m) (game-b m)))