diff options
Diffstat (limited to '2015/day-02/day-02.rkt')
| -rw-r--r-- | 2015/day-02/day-02.rkt | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/2015/day-02/day-02.rkt b/2015/day-02/day-02.rkt new file mode 100644 index 0000000..870e380 --- /dev/null +++ b/2015/day-02/day-02.rkt @@ -0,0 +1,48 @@ +#lang racket +(require "../../jj-aoc.rkt" + threading + racket/struct) + +(struct present (l w h) #:transparent) + +(define presents + (for/list ([size-string (in-lines (open-day 2 2015))]) + (~> size-string + (string-split "x") + (map string->number _) + (apply present _)))) + +;; part 1 +(define (paper-area p) + (define main-area + (~> p + struct->list + (combinations 2) + (map (λ~> (apply * 2 _)) _) + (apply + _))) + (define slack-area + (~> p + struct->list + (sort <) + (take 2) + (apply * _))) + (+ main-area slack-area)) + +(for/sum ([p (in-list presents)]) (paper-area p)) + +;; part 2 +(define (ribbon-length p) + (define ribbon-around-box + (~> p + struct->list + (sort <) + (take 2) + (map (λ~> (* 2)) _) + (apply + _))) + (define ribbon-for-bow + (~> p + struct->list + (apply * _))) + (+ ribbon-around-box ribbon-for-bow)) + +(for/sum ([p (in-list presents)]) (ribbon-length p))
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