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| author | H.J <thechairman@thechairman.info> | 2024-10-09 11:36:55 -0400 |
|---|---|---|
| committer | H.J <thechairman@thechairman.info> | 2024-10-09 11:36:55 -0400 |
| commit | 8777ff071f7bb37631baa7b6717ad29961e50911 (patch) | |
| tree | 6d59c4ed58e454b960339c3d1151f0a879e8d7cb /racket/aoc2020/day-03/day-03.rkt | |
| parent | 6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff) | |
| download | gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.tar.gz gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.zip | |
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Diffstat (limited to 'racket/aoc2020/day-03/day-03.rkt')
| -rw-r--r-- | racket/aoc2020/day-03/day-03.rkt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/racket/aoc2020/day-03/day-03.rkt b/racket/aoc2020/day-03/day-03.rkt new file mode 100644 index 0000000..ee9edcf --- /dev/null +++ b/racket/aoc2020/day-03/day-03.rkt @@ -0,0 +1,16 @@ +#lang racket +(require "../../jj-aoc.rkt" + threading) + +(define (check-for-trees run rise) + (for*/sum ([(row i) (in-indexed (port->lines (open-day 3 2020)))] + #:when (= 0 (modulo i rise)) + [possible-tree (in-value (sequence-ref (in-cycle row) (* (/ run rise) i)))] + #:when (and (char=? possible-tree #\#))) + 1)) + +;; part 1 +(check-for-trees 3 1) + +;; part 2 +(~>> '((1 1) (3 1) (5 1) (7 1) (1 2)) (map (curry apply check-for-trees)) (apply *)) |