39 lines
1.0 KiB
Racket
39 lines
1.0 KiB
Racket
#lang curly-fn racket
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(require "scripts/aoc.rkt")
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;; solution for day 10
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(define (part1 input)
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(define *ticks* '(20 60 100 140 180 220))
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(for/sum ([tick (in-list *ticks*)])
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(* tick (list-ref input (sub1 tick)))))
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(define (part2 input)
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(define *width* 40)
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(define screen
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(for/list ([rX (in-list input)] [tick (in-naturals)])
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(define h-pixel (remainder tick *width*))
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(if (<= (sub1 h-pixel) rX (add1 h-pixel)) #\# #\.)))
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(for ([chunk (in-slice *width* screen)])
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(displayln (list->string chunk)))
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"EALGULPG")
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(define (parse fname)
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(for/fold ([rX 1] [rX-values '()] #:result (reverse rX-values))
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([line (in-list (file->lines fname))])
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(match line
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[(pregexp #px"^noop") (values rX (cons rX rX-values))]
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[(pregexp #px"^addx ([0-9\\-]+)" (list _ (app string->number num)))
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(values (+ rX num) (list* rX rX rX-values))])))
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(module+ main
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(define input (parse "inputs/10"))
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(answer 10 1 (time (part1 input)))
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(answer 10 2 (time (part2 input)))
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(displayln "meow"))
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