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| author | J.J <thechairman@thechairman.info> | 2023-11-30 17:10:00 -0500 |
|---|---|---|
| committer | J.J <thechairman@thechairman.info> | 2023-11-30 17:10:00 -0500 |
| commit | 8ab65dc2da1742eb86ec636c50c7018385b68167 (patch) | |
| tree | c4fd556aca9b867cfa1f2f174128c30857353884 /aoc2020/day-03 | |
| parent | fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 (diff) | |
| download | gleam_aoc-8ab65dc2da1742eb86ec636c50c7018385b68167.tar.gz gleam_aoc-8ab65dc2da1742eb86ec636c50c7018385b68167.zip | |
prep for 2023, renaming for consistency
Diffstat (limited to 'aoc2020/day-03')
| -rw-r--r-- | aoc2020/day-03/day-03.rkt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/aoc2020/day-03/day-03.rkt b/aoc2020/day-03/day-03.rkt new file mode 100644 index 0000000..ee9edcf --- /dev/null +++ b/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 *)) |