sorting by language

1 files changed, 0 insertions, 32 deletions

diff --git a/aoc2020/day-13/day-13.rkt b/aoc2020/day-13/day-13.rkt
deleted file mode 100644
index b53f045..0000000
--- a/aoc2020/day-13/day-13.rkt
+++ /dev/null
@@ -1,32 +0,0 @@
-#lang racket
-
-(require advent-of-code
-         (only-in relation ->number)
-         threading)
-
-(define (process-ids str)
-  (~> str (string-split ",") (filter-map (λ (s) (string->number s 10 'number-or-false)) _)))
-
-(match-define (regexp #px"(\\d+)\n(.+)" (list _ (app ->number timestamp) raw-bus-ids))
-  (fetch-aoc-input (find-session) 2020 13))
-
-(define bus-ids (process-ids raw-bus-ids))
-
-;; part 1
-(for/first ([minute (in-naturals timestamp)]
-            #:do [(define departing-bus
-                    (for/first ([b bus-ids] #:when (= 0 (remainder minute b)))
-                      b))]
-            #:when departing-bus)
-  (* departing-bus (- minute timestamp)))
-
-;; part 2
-(for/fold ([step 1] [current-timestamp 1] #:result current-timestamp)
-          ([b* (in-list (string-split (string-trim raw-bus-ids) ","))]
-           [offset (in-naturals)]
-           #:unless (equal? b* "x")
-           #:do [(define bus (->number b*))])
-  (values
-   (* step bus)
-   (for/first ([n (in-range current-timestamp +inf.0 step)] #:when (= 0 (remainder (+ n offset) bus)))
-     n)))