prep for 2023, renaming for consistency

1 files changed, 0 insertions, 39 deletions

diff --git a/2019/day-04/day-04.rkt b/2019/day-04/day-04.rkt
deleted file mode 100644
index 9518779..0000000
--- a/2019/day-04/day-04.rkt
+++ /dev/null
@@ -1,39 +0,0 @@
-#lang racket
-
-(define (number->digits n [acc '()])
-  (cond
-    [(< n 10) (cons n acc)]
-    [else (number->digits (quotient n 10) (cons (remainder n 10) acc))]))
-
-(define (always-increasing? xs)
-  (match xs
-    [(list _) #t]
-    [(list* a b _) #:when (<= a b) (always-increasing? (cdr xs))]
-    [_ #f]))
-
-(define (adjacent-pair? xs)
-  (match xs
-    [(list _) #f]
-    [(list* a a _) a]
-    [_ (adjacent-pair? (cdr xs))]))
-
-;; part 1
-(for/sum ([password (inclusive-range 125730 579381)]
-          #:do [(define digits (number->digits password))]
-          #:when ((conjoin always-increasing? adjacent-pair?) digits))
-  1)
-
-;; part 2
-(define (not-in-adjacent-triplet? xs)
-  (match xs
-    [(list a a c _ _ _) #:when (not (= a c)) #t]
-    [(list b a a c _ _) #:when (not (or (= a b) (= a c))) #t]
-    [(list _ b a a c _) #:when (not (or (= a b) (= a c))) #t]
-    [(list _ _ b a a c) #:when (not (or (= a b) (= a c))) #t]
-    [(list _ _ _ b a a) #:when (not (= a b)) #t]
-    [_ #f]))
-
-(for/sum ([password (inclusive-range 125730 579381)]
-          #:do [(define digits (number->digits password))]
-          #:when ((conjoin always-increasing? adjacent-pair? not-in-adjacent-triplet?) digits))
-  1)
\ No newline at end of file