Initial commit

2020/day24/day24.rkt

@@ -0,0 +1,80 @@
+#lang racket
+
+(module+ test
+  (require rackunit))
+
+(define (read-input filename)
+  (map string->tile (file->lines filename)))
+
+(define (string->tile str)
+  (path->tile (map string->symbol (regexp-match* #rx"(e|w|se|sw|ne|nw)" str))))
+
+(define (path->tile path)
+  (define-values (q r)
+    (for/fold ([q 0]
+               [r 0])
+              ([s (in-list path)])
+      (match s
+        ['e (values (add1 q) r)]
+        ['ne (values (add1 q) (sub1 r))]
+        ['nw (values q (sub1 r))]
+        ['w (values (sub1 q) r)]
+        ['sw (values (sub1 q) (add1 r))]
+        ['se (values q (add1 r))])))
+  (list q r))
+
+(define (initial-grid tiles)
+  (define grid (make-hash))
+  (for ([tile (in-list tiles)])
+    (hash-update! grid tile not #f))
+  grid)
+
+(define (count-alive grid)
+  (for/sum ([(k v) (in-hash grid)]
+            #:when v)
+    1))
+
+(define (part1 filename)
+  (define tiles (read-input filename))
+  (count-alive (initial-grid tiles)))
+
+(module+ test
+  (check-equal? (part1 "test") 10))
+
+(module+ main
+  (displayln (part1 "input")))
+
+(define (count-alive-neighbours grid tile)
+  (define q (car tile))
+  (define r (cadr tile))
+  (for*/sum ([i (in-range -1 2)]
+             [j (in-range -1 2)]
+             #:unless (= 0 i j)
+             #:unless (= 2 (abs (+ i j)))
+             #:when (hash-ref grid (list (+ q i) (+ r j)) #f))
+    1))
+
+(define (step grid)
+  (define size (+ 2 (apply max (flatten (hash-keys grid)))))
+  (for*/hash ([q (in-range (- size) size)]
+              [r (in-range (- size) size)])
+    (define color (hash-ref grid (list q r) #f))
+    (define n (count-alive-neighbours grid (list q r)))
+    (values (list q r)
+            (cond
+              [(and color (or (= 0 n) (> n 2))) #f]
+              [(and (not color) (= 2 n)) #t]
+              [else color]))))
+
+(define (part2 filename)
+  (define tiles (read-input filename))
+  (count-alive
+   (for/fold ([grid (initial-grid tiles)])
+             ([i (in-range 100)])
+     (step grid))))
+
+(module+ test
+  (check-equal? (part2 "test") 2208))
+
+(module+ main
+  (displayln (part2 "input")))

2020/day24/input

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2020/day24/test

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