Day 19.

input/19.txt

@@ -0,0 +1,627 @@
+50: 5 18 | 61 39
+79: 118 18 | 125 39
+102: 38 39 | 19 18
+114: 39 38 | 18 100
+119: 39 103
+40: 39 72 | 18 38
+10: 18 125 | 39 132
+44: 51 39 | 118 18
+18: "a"
+55: 18 33 | 39 4
+101: 18 100 | 39 100
+28: 110 39 | 96 18
+11: 42 31
+92: 26 39 | 110 18
+2: 18 93 | 39 44
+27: 73 18 | 135 39
+0: 8 11
+8: 42
+14: 18 18
+41: 109 39 | 58 18
+4: 64 39 | 100 18
+85: 65 18 | 27 39
+122: 39 39 | 18 66
+123: 103 39 | 72 18
+72: 18 39 | 66 18
+130: 18 132 | 39 125
+135: 39 74 | 18 32
+67: 18 54 | 39 20
+133: 39 105 | 18 128
+116: 71 18 | 14 39
+88: 18 84 | 39 124
+111: 100 39 | 100 18
+1: 38 18 | 122 39
+51: 18 39 | 18 18
+109: 16 39 | 87 18
+25: 18 56 | 39 97
+78: 18 35 | 39 41
+12: 18 43 | 39 101
+29: 39 37 | 18 10
+134: 18 122 | 39 71
+5: 39 72 | 18 14
+96: 18 125 | 39 14
+47: 39 121 | 18 15
+63: 13 18 | 1 39
+16: 14 18 | 72 39
+43: 100 18 | 38 39
+115: 18 100
+54: 51 66
+105: 39 51 | 18 132
+107: 82 39 | 50 18
+87: 122 39
+76: 14 18 | 48 39
+30: 39 64 | 18 100
+17: 104 39 | 107 18
+95: 39 47 | 18 63
+34: 134 39 | 130 18
+24: 19 18 | 122 39
+106: 39 100
+121: 38 18 | 71 39
+126: 75 39 | 43 18
+23: 18 48 | 39 125
+90: 18 127 | 39 20
+56: 62 39 | 30 18
+89: 49 18 | 22 39
+113: 87 39 | 59 18
+48: 39 39 | 18 39
+49: 72 39 | 125 18
+68: 18 3 | 39 80
+112: 69 18 | 17 39
+71: 66 66
+58: 114 39 | 111 18
+104: 18 90 | 39 2
+86: 39 91 | 18 9
+99: 18 100 | 39 71
+19: 18 18 | 39 66
+42: 18 83 | 39 112
+31: 85 18 | 94 39
+7: 4 39 | 24 18
+97: 57 39 | 117 18
+75: 100 39 | 122 18
+37: 100 18 | 103 39
+117: 39 14 | 18 100
+129: 103 18 | 125 39
+32: 36 18 | 40 39
+60: 48 39
+128: 18 14 | 39 19
+61: 100 39
+84: 98 39 | 76 18
+93: 39 71 | 18 51
+26: 18 72
+83: 18 131 | 39 78
+59: 18 125 | 39 48
+33: 18 71 | 39 48
+3: 18 99 | 39 23
+20: 39 122 | 18 72
+9: 39 133 | 18 108
+6: 75 18 | 123 39
+52: 39 81 | 18 67
+62: 18 125 | 39 72
+108: 18 13 | 39 120
+81: 18 79 | 39 129
+77: 92 18 | 6 39
+124: 119 18 | 60 39
+82: 116 18 | 10 39
+110: 71 39 | 48 18
+98: 132 18 | 14 39
+74: 18 70 | 39 115
+91: 39 21 | 18 12
+132: 18 18 | 39 18
+100: 39 18
+53: 18 29 | 39 34
+125: 39 39 | 18 18
+131: 39 77 | 18 46
+103: 66 39 | 39 18
+65: 53 18 | 52 39
+38: 39 39 | 39 18
+39: "b"
+21: 99 18 | 102 39
+36: 103 39 | 125 18
+73: 18 7 | 39 89
+118: 18 39
+57: 14 18 | 64 39
+35: 39 55 | 18 28
+66: 18 | 39
+94: 39 86 | 18 45
+80: 106 39 | 134 18
+127: 39 14 | 18 48
+64: 39 18 | 18 39
+69: 95 39 | 25 18
+45: 88 39 | 68 18
+15: 39 38 | 18 71
+70: 18 132 | 39 118
+13: 100 18 | 132 39
+46: 18 126 | 39 113
+120: 39 71 | 18 125
+22: 39 100 | 18 48
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src/19.rkt

@@ -0,0 +1,59 @@
+#lang curly-fn racket
+
+(require "../lib.rkt")
+
+(define (parse-rule rule)
+  (match rule
+    [(regexp #px"(\\d+): (.+)" (list _ rule alts))
+     (cons (string->number rule)
+           (~>> alts
+                (string-replace _ "|" ")(")
+                (format "((~a))")
+                open-input-string
+                read))]))
+
+(define-values (rules msgs)
+  (match-let ([(list rules msgs) (problem-input-grouped 19)])
+    (values (make-hash (map parse-rule (string-lines rules)))
+            (string-lines msgs))))
+
+(define (ruleset start)
+  (list->set
+   ;; loop: number? -> (listof string?)
+   (let loop ([rule start])
+     (apply append
+            (map #{match %
+                    [`(,l) #:when (string? l) %]
+                    [`(,rs ...) (map #{apply string-append %}
+                                     (apply cartesian-product
+                                            (map #{loop %} rs)))]}
+                 (hash-ref rules rule))))))
+
+(define rule42 (ruleset 42))
+(define rule31 (ruleset 31))
+(define len (string-length (set-first rule42)))
+
+(define (string-group len str)
+  (for/list ([group (/ (string-length str) len)])
+    (substring str (* group len) (* (add1 group) len))))
+
+(define (matches-rules-1 str)
+  (and (= (string-length str) (* 3 len))
+       (let ([strs (string-group len str)])
+         (and (set-member? rule42 (first strs))
+              (set-member? rule42 (second strs))
+              (set-member? rule31 (third strs))))))
+
+(define (matches-rules-2 str)
+  (and (zero? (remainder (string-length str) len))
+       (let* ([strs (string-group len str)]
+              [count (length strs)])
+         (for/or ([c (in-range (add1 (floor (/ count 2))) count)])
+           (and (andmap #{set-member? rule42 %} (take strs c))
+                (andmap #{set-member? rule31 %} (drop strs c)))))))
+
+(define-values (part1 part2)
+  (values (count #{matches-rules-1 %} msgs)
+          (count #{matches-rules-2 %} msgs)))
+
+(show-solution part1 part2)