diff options
Diffstat (limited to 'racket/aoc2015/day-04/day-04.rkt')
| -rw-r--r-- | racket/aoc2015/day-04/day-04.rkt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/racket/aoc2015/day-04/day-04.rkt b/racket/aoc2015/day-04/day-04.rkt new file mode 100644 index 0000000..2c16043 --- /dev/null +++ b/racket/aoc2015/day-04/day-04.rkt @@ -0,0 +1,18 @@ +#lang racket +(require "../../jj-aoc.rkt" + threading + file/md5) + +(define secret-key (~> (open-day 4 2015) port->string string-trim)) + +(define (find-n-zeroes n) + (for/first ([i (in-naturals)] + #:when + (~>> i (~a secret-key) md5 bytes->string/utf-8 (string-prefix? _ (make-string n #\0)))) + i)) + +;; part 1 +(time (find-n-zeroes 5)) + +;; part 2 +(time (find-n-zeroes 6)) |