diff options
Diffstat (limited to 'racket/aoc2018/day-01/day-01.rkt')
| -rw-r--r-- | racket/aoc2018/day-01/day-01.rkt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/racket/aoc2018/day-01/day-01.rkt b/racket/aoc2018/day-01/day-01.rkt new file mode 100644 index 0000000..b18f7c9 --- /dev/null +++ b/racket/aoc2018/day-01/day-01.rkt @@ -0,0 +1,16 @@ +#lang racket + +(require advent-of-code + threading) + +(define deltas + (~>> (open-aoc-input (find-session) 2018 1 #:cache #true) port->lines (map string->number))) + +;; part 1 +(for/sum ([delta deltas]) delta) + +;; part 2 +(for/fold ([seen (set)] [current-frequency 0] #:result current-frequency) ([delta (in-cycle deltas)]) + (define new-frequency (+ current-frequency delta)) + #:final (set-member? seen new-frequency) + (values (set-add seen new-frequency) new-frequency)) |