day 19

2020/19.rkt

@@ -0,0 +1,44 @@
+#lang br
+(require racket/file rackunit br/module)
+
+(begin-for-syntax
+  (require racket/match racket/string racket/file)
+  (define rules
+    (let* ([str (file->string "19.rktd")]
+           [str (car (string-split str "\n\n"))]
+           [strs (string-split str "\n")])
+      (sort strs string<?))))
+
+(define-syntax (make-parser-submodule stx)
+  (syntax-case stx ()
+    [(_ ID)
+     #`(module/lang
+        ID
+        #,(regexp-replace* #px"(\\d+)"
+                           (string-join (cons "#lang brag" rules) "\n") "rule\\1"))]))
+
+(make-parser-submodule parser1)
+(require (prefix-in parser1: 'parser1))
+
+(define samples
+  (string-split (cadr (string-split (file->string "19.rktd") "\n\n")) "\n"))
+
+(define (solve parser)
+  (for/sum ([sample samples])
+    (with-handlers ([exn:fail? (λ (exn) 0)])
+      (parser sample)
+      1)))
+
+(check-equal? (solve parser1:parse) 129)
+
+(begin-for-syntax
+  (set! rules
+        (for/list ([rule rules])
+          (match rule
+            ["8: 42" "8: 42 | 42 8"]
+            ["11: 42 31" "11: 42 31 | 42 11 31"]
+            [_ rule]))))
+
+(make-parser-submodule parser2)
+(require (prefix-in parser2: 'parser2))
+(check-equal? (solve parser2:parse) 243)

2020/19.rktd

@@ -0,0 +1,496 @@
+97: 138 57 | 12 83
+131: 20 83 | 74 57
+7: 57 110 | 83 51
+48: 17 83 | 56 57
+2: 83 57
+40: 57 101 | 83 93
+16: 12 83 | 47 57
+42: 15 83 | 66 57
+62: 83 134 | 57 18
+55: 124 57 | 45 83
+1: 57 116 | 83 93
+63: 83 1 | 57 32
+83: "a"
+72: 57 83 | 83 83
+18: 83 57 | 57 83
+67: 90 83 | 99 57
+91: 83 108 | 57 72
+8: 42
+116: 83 18 | 57 72
+41: 57 83
+130: 57 84 | 83 50
+26: 57 12 | 83 124
+103: 134 57 | 45 83
+39: 83 18 | 57 138
+46: 83 47 | 57 138
+129: 57 138 | 83 108
+58: 108 57 | 72 83
+138: 57 57 | 83 57
+49: 58 57 | 26 83
+133: 57 79 | 83 13
+125: 83 124 | 57 72
+123: 105 83 | 134 57
+128: 45 57 | 2 83
+24: 83 117 | 57 76
+86: 57 12 | 83 85
+76: 107 57 | 123 83
+70: 83 37 | 57 112
+51: 83 45 | 57 54
+37: 47 57 | 72 83
+9: 57 124 | 83 105
+61: 57 19 | 83 47
+75: 108 83 | 105 57
+120: 83 105 | 57 18
+124: 57 57 | 83 83
+4: 41 83 | 12 57
+0: 8 11
+27: 83 41
+89: 57 29 | 83 40
+111: 54 83 | 18 57
+12: 57 57
+53: 57 52 | 83 73
+90: 83 130 | 57 48
+59: 55 83 | 125 57
+21: 45 83 | 19 57
+30: 83 7 | 57 70
+88: 41 57 | 2 83
+71: 60 57 | 44 83
+74: 98 57 | 14 83
+87: 131 57 | 30 83
+73: 49 83 | 94 57
+82: 83 41 | 57 138
+35: 83 22 | 57 89
+136: 57 105 | 83 108
+94: 83 129 | 57 86
+65: 83 72 | 57 108
+105: 95 95
+77: 83 78 | 57 92
+19: 83 83
+92: 95 138
+104: 18 83 | 124 57
+43: 83 102 | 57 103
+99: 115 57 | 23 83
+135: 83 93 | 57 97
+23: 81 57 | 69 83
+115: 83 132 | 57 25
+110: 85 57 | 18 83
+52: 83 3 | 57 137
+3: 68 57 | 106 83
+15: 35 83 | 53 57
+106: 41 83 | 85 57
+60: 113 83 | 24 57
+93: 12 57
+66: 87 83 | 133 57
+34: 55 83 | 28 57
+80: 83 41 | 57 85
+28: 72 57 | 124 83
+45: 83 57 | 83 83
+38: 58 57 | 61 83
+25: 4 83 | 62 57
+14: 57 124 | 83 138
+29: 136 83 | 121 57
+64: 18 83 | 19 57
+81: 122 57 | 9 83
+137: 33 83 | 91 57
+118: 100 57 | 120 83
+98: 108 57 | 41 83
+114: 83 72 | 57 45
+132: 128 57 | 75 83
+107: 83 134 | 57 72
+50: 123 83 | 114 57
+78: 41 83 | 19 57
+79: 57 118 | 83 77
+32: 62 57 | 109 83
+10: 59 83 | 43 57
+119: 39 57 | 111 83
+36: 57 134 | 83 41
+6: 83 2 | 57 138
+69: 126 83 | 27 57
+57: "b"
+113: 5 83 | 38 57
+112: 138 83 | 105 57
+33: 108 83 | 45 57
+127: 41 57 | 12 83
+22: 83 34 | 57 119
+20: 57 127 | 83 80
+85: 95 57 | 57 83
+68: 134 57 | 19 83
+44: 83 63 | 57 10
+47: 83 95 | 57 57
+54: 57 57 | 57 83
+96: 36 57 | 21 83
+84: 98 57 | 46 83
+117: 83 16 | 57 65
+95: 83 | 57
+122: 18 83 | 41 57
+101: 83 41 | 57 72
+121: 134 57 | 108 83
+56: 82 83 | 6 57
+17: 83 88 | 57 93
+108: 57 95 | 83 83
+109: 134 83 | 124 57
+134: 95 83 | 83 57
+5: 104 83 | 64 57
+100: 41 83 | 138 57
+126: 54 83 | 45 57
+11: 42 31
+13: 57 135 | 83 96
+31: 83 71 | 57 67
+102: 19 57 | 72 83
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