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-rw-r--r--aoc2023-other/day-02/day-02.rkt35
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diff --git a/aoc2023-other/day-02/day-02.rkt b/aoc2023-other/day-02/day-02.rkt
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--- a/aoc2023-other/day-02/day-02.rkt
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-#lang racket
-
-(require advent-of-code)
-
-(struct roll (id red green blue))
-
-(define all-games
- (for/list ([raw-game (in-list (port->lines (open-aoc-input (find-session) 2023 2)))]
- #:do [(define game (string-trim raw-game "Game "))
- (match-define (list id trials) (string-split game ": "))])
- (for/list ([trial (in-list (string-split trials "; "))])
- (for/fold ([acc (roll (string->number id) 0 0 0)])
- ([color (in-list (string-split trial ", "))])
- (match (string-split color)
- [(list (app string->number n) "red") (struct-copy roll acc [red n])]
- [(list (app string->number n) "green") (struct-copy roll acc [green n])]
- [(list (app string->number n) "blue") (struct-copy roll acc [blue n])])))))
-
-;; part 1
-(for/sum ([game (in-list all-games)]
- #:when (andmap (λ (g) (and ((roll-red g) . <= . 12)
- ((roll-green g) . <= . 13)
- ((roll-blue g) . <= . 14)))
- game))
- (roll-id (first game)))
-
-;; part 2
-(for/sum ([game (in-list all-games)])
- (define max-cubes
- (for/fold ([acc (roll #f 0 0 0)]) ([r (in-list game)])
- (roll #f
- (max (roll-red acc) (roll-red r))
- (max (roll-green acc) (roll-green r))
- (max (roll-blue acc) (roll-blue r)))))
- (* (roll-red max-cubes) (roll-green max-cubes) (roll-blue max-cubes)))