Day 04.

input/04-example.txt

@@ -0,0 +1,17 @@
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+
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+
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+ 2  0 12  3  7

input/04-order.txt

@@ -0,0 +1 @@
+6,69,28,50,36,84,49,13,48,90,1,33,71,0,94,59,53,58,60,96,30,34,29,91,11,41,77,95,17,80,85,93,7,9,74,89,18,25,26,8,87,38,68,5,12,43,27,46,62,73,16,55,22,4,65,76,54,52,83,10,21,67,15,47,45,40,35,66,79,51,75,39,64,24,37,72,3,44,82,32,78,63,57,2,86,31,19,92,14,97,20,56,88,81,70,61,42,99,23,98

input/04.txt

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lib.rkt

@@ -93,6 +93,10 @@
                                        (cadar replaces))
                        (rest replaces))))
 
+;; string-words : string? -> (listof string?)
+(define (string-words str)
+  (string-split str #rx" +"))
+
 ;; string-lines : string? -> (listof string?)
 (define (string-lines str)
   (string-split str "\n"))

src/04.rkt

@@ -0,0 +1,62 @@
+#lang curly-fn racket
+
+(require "../lib.rkt")
+
+(define order
+  (~> (problem-input 4 "-order")
+      first
+      (string-split ",")
+      (map string->number _)))
+
+(define boards
+  (~> (problem-input-grouped 4)
+      (map string-lines _)
+      (map #{map string-words %} _)
+      (map #{map #{map string->number %} %} _)))
+
+(define (winner? board)
+  (or (ormap #{andmap false? %} board)
+      (ormap #{andmap (λ (row) (false? (list-ref row %))) board} (range 5))))
+
+(define (blot board n)
+  (for/list ([row board])
+    (for/list ([m row])
+      (if (equal? n m)
+          #f m))))
+
+(define (score board)
+  (sum (filter number? (apply append board))))
+
+(define-values (winner n)
+  (for/fold ([boards boards]
+             [winner #f]
+             [winning #f]
+             #:result (values winner winning))
+            ([n order]
+             #:break winner)
+    (define boards*
+      (for/list ([board boards])
+        (blot board n)))
+    (define winner
+      (findf winner? boards*))
+    (values boards* winner n)))
+
+(define-values (loser m)
+  (for/fold ([boards boards]
+             [losing #f]
+             #:result (values (first boards) losing))
+            ([m order]
+             #:break (and (singleton? boards)
+                          (winner? (first boards))))
+    (define boards*
+      (for/list ([board (filter (∘ not winner?) boards)])
+        (blot board m)))
+    (values boards* m)))
+
+(define part1
+  (* n (score winner)))
+
+(define part2
+  (* m (score loser)))
+
+(show-solution part1 part2)