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73 lines
3.8 KiB
Racket
73 lines
3.8 KiB
Racket
8 years ago
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#lang typed/racket
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(require typed/rackunit)
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(provide (all-defined-out))
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(: str->ingredient-hash (-> String (HashTable String (Listof Integer))))
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(define (str->ingredient-hash str)
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(for/hash : (HashTable String (Listof Integer))
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([ln (in-list (string-split (string-replace str "," " ") "\n"))])
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(match-define (list ingredient-name characteristic-string)
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(string-split ln ":"))
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(values ingredient-name
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(filter exact-integer? ;;bg;number?
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(map string->number
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(string-split characteristic-string))))))
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(: make-recipes (-> Integer Integer (Listof (Listof Integer))))
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(define (make-recipes how-many-ingredients total-tsps)
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(cond
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[(= 0 how-many-ingredients) empty]
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[(= 1 how-many-ingredients) (list (list total-tsps))]
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[else
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(append*
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(for/list ([first-amount (in-range (add1 total-tsps))])
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: (Listof (Listof (Listof Integer)))
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(map (λ ([x : (Listof Integer)]) (cons first-amount x)) ;(curry cons first-amount)
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(make-recipes (sub1 how-many-ingredients)
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(- total-tsps first-amount)))))]))
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(: q1 (-> String Integer))
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(define (q1 input-str)
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(define ingredient-hash (str->ingredient-hash input-str))
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(define ingredients (hash-keys ingredient-hash))
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(define how-many-characteristics (length (car (hash-values ingredient-hash))))
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(define tsps 100)
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(define scores
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(for/list ([recipe (in-list (make-recipes (length ingredients) tsps))])
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: (Listof Integer)
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(for/product : Integer ([char-idx (in-range (sub1 how-many-characteristics))])
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(max 0 (for/sum : Integer
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([tsp-quantity (in-list recipe)]
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[ingredient (in-list ingredients)])
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(* tsp-quantity
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(list-ref (hash-ref ingredient-hash ingredient) char-idx)))))))
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(apply max scores))
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(: q2 (-> String Integer))
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(define (q2 input-str)
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(define ingredient-hash (str->ingredient-hash input-str))
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(define ingredients (hash-keys ingredient-hash))
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(define how-many-characteristics (length (car (hash-values ingredient-hash))))
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(define tsps 100)
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(: recipe->calories (-> (Listof Integer) Integer))
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(define (recipe->calories recipe)
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(for/sum : Integer ([tsp-quantity (in-list recipe)]
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[ingredient (in-list ingredients)])
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(* tsp-quantity (last (hash-ref ingredient-hash ingredient (λ () (error 'bg)))))))
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(define scores
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(for/list : (Listof Integer) ([recipe (in-list (make-recipes (length ingredients) tsps))]
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#:when (= 500 (recipe->calories recipe)))
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(for/product : Integer ([char-idx (in-range (sub1 how-many-characteristics))])
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(max 0 (for/sum : Integer ([tsp-quantity (in-list recipe)]
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[ingredient (in-list ingredients)])
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(* tsp-quantity
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(list-ref (hash-ref ingredient-hash ingredient) char-idx)))))))
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(apply max scores))
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(module+ test
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(define input-str (file->string "../day15-input.txt"))
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(check-equal? (q1 input-str) 18965440)
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(check-equal? (q2 input-str) 15862900))
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