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Diffstat (limited to 'racket/aoc2015/day-01/day-01.rkt')
| -rw-r--r-- | racket/aoc2015/day-01/day-01.rkt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/racket/aoc2015/day-01/day-01.rkt b/racket/aoc2015/day-01/day-01.rkt new file mode 100644 index 0000000..efbd02a --- /dev/null +++ b/racket/aoc2015/day-01/day-01.rkt @@ -0,0 +1,16 @@ +#lang racket +(require "../../jj-aoc.rkt") + +;; part 1 +(for/fold ([current-floor 0]) ([l (in-input-port-chars (open-day 1 2015))] [i (in-naturals)]) + (match l + [#\( (add1 current-floor)] + [#\) (sub1 current-floor)])) + +;; part 2 +(for/fold ([current-floor 0] [last-index 0] #:result (add1 last-index)) + ([l (in-input-port-chars (open-day 1 2015))] [i (in-naturals)]) + #:break (= current-floor -1) + (match l + [#\( (values (add1 current-floor) i)] + [#\) (values (sub1 current-floor) i)])) |