day 2: 2 shonk 2 furious
This commit is contained in:
parent
b55369a332
commit
76cd3ad58e
|
@ -0,0 +1,31 @@
|
|||
#lang racket
|
||||
|
||||
(require "scripts/aoc.rkt")
|
||||
|
||||
;; solution for day 2
|
||||
|
||||
(define (password-valid-part1? lmin lmax char password)
|
||||
(<= lmin (count (curry char=? char) (string->list password)) lmax))
|
||||
|
||||
(define (password-valid-part2? a b char password)
|
||||
(define pwd-chars (string->list password))
|
||||
(xor (char=? (string-ref password (sub1 a)) char)
|
||||
(char=? (string-ref password (sub1 b)) char)))
|
||||
|
||||
(define (calculate valid-proc input)
|
||||
(for/sum ([line (in-list input)])
|
||||
(match line
|
||||
[(pregexp #px"^([0-9]+)\\-([0-9]+) (.): (.*?)$" (list _ lmin lmax char password))
|
||||
(if (valid-proc (string->number lmin) (string->number lmax)
|
||||
(string-ref char 0) password) 1 0)]
|
||||
[_ (error "failed to parse" line)])))
|
||||
|
||||
(module+ main
|
||||
(define input (file->lines "inputs/2"))
|
||||
;; part 1
|
||||
(answer 2 1 (calculate password-valid-part1? input))
|
||||
|
||||
;; part 2
|
||||
(answer 2 2 (calculate password-valid-part2? input))
|
||||
|
||||
(displayln "meow"))
|
Loading…
Reference in New Issue