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#lang racket
(require "../../jj-aoc.rkt"
threading)
(define strs (port->lines (open-day 5 2015)))
;; part 1
(define (at-least-three-vowels? str)
(~>> str
(regexp-replace* #px"[^aeiou]" _ "")
string-length
(<= 3)))
(define (at-least-one-pair? str)
(regexp-match? #px"(.)\\1{1,}" str))
(define (no-forbidden-pairs? str)
(~>> (list "ab" "cd" "pq" "xy")
(ormap (λ~>> (string-contains? str)))
not))
(define (nice? str)
(~>> (list at-least-three-vowels?
at-least-one-pair?
no-forbidden-pairs?)
(andmap (λ (f) (f str)))))
(count nice? strs)
;; part 2
(define (repeating-pair? str)
(regexp-match? #px"(..).*\\1" str))
(define (symmetry? str)
(regexp-match? #px"(.).\\1" str))
(define (new-nice? str)
(~>> (list repeating-pair? symmetry?)
(andmap (λ (f) (f str)))))
(count new-nice? strs)
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