Solve 2020 day 19

2020/19_regex.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+import regex
+import sys
+
+def parse(f):
+    rules = {}
+    for line in f:
+        if line == '\n':
+            break
+        ident, rule = line.rstrip().split(': ')
+        rules[int(ident)] = rule.replace('"', '')
+    return rules, f.read().splitlines()
+
+def match(rules, messages):
+    def expand(word):
+        return group(int(word)) if word.isdigit() else word
+    def group(ident):
+        return '(?:' + ''.join(map(expand, rules[ident].split())) + ')'
+    reg = regex.compile(group(0))
+    return sum(reg.fullmatch(m) is not None for m in messages)
+
+rules, messages = parse(sys.stdin)
+print(match(rules, messages))
+
+rules[8] = '42 +'
+rules[11] = '(?P<group> 42 (?&group)? 31 )'
+print(match(rules, messages))

2020/input/19

@@ -0,0 +1,516 @@
+58: 127 99 | 105 36
+56: 71 99 | 102 36
+116: 36 | 99
+42: 19 36 | 68 99
+67: 36 71 | 99 73
+117: 81 99 | 80 36
+77: 99 37 | 36 83
+106: 27 99 | 32 36
+73: 36 99 | 99 99
+126: 15 36 | 73 99
+133: 99 99 | 36 116
+92: 99 51 | 36 14
+61: 99 21 | 36 6
+6: 54 116
+33: 36 103 | 99 9
+131: 54 99 | 15 36
+81: 36 38 | 99 78
+93: 99 100 | 36 87
+1: 113 99 | 129 36
+36: "b"
+70: 99 130 | 36 122
+76: 99 4 | 36 44
+79: 65 99 | 48 36
+99: "a"
+108: 118 99 | 96 36
+15: 36 36
+2: 99 102 | 36 27
+103: 109 99 | 136 36
+9: 23 99 | 63 36
+12: 15 99 | 123 36
+137: 36 54 | 99 20
+13: 36 30 | 99 70
+7: 99 32 | 36 102
+94: 18 36 | 59 99
+71: 36 99
+3: 99 104 | 36 62
+4: 72 99 | 114 36
+32: 36 36 | 99 36
+21: 27 99 | 122 36
+52: 99 20 | 36 73
+135: 99 116 | 36 99
+31: 95 99 | 89 36
+24: 99 107 | 36 125
+19: 36 77 | 99 28
+112: 15 36 | 15 99
+89: 99 50 | 36 111
+23: 99 34 | 36 73
+69: 36 54 | 99 73
+85: 12 99 | 25 36
+53: 36 54
+95: 36 76 | 99 117
+124: 106 99 | 22 36
+10: 102 99 | 122 36
+107: 99 133 | 36 34
+129: 54 99 | 71 36
+16: 36 130 | 99 27
+86: 36 122 | 99 102
+45: 97 36 | 41 99
+102: 99 99 | 116 36
+25: 32 36 | 133 99
+87: 99 52 | 36 115
+119: 91 99 | 101 36
+34: 99 99
+121: 36 91 | 99 52
+29: 102 36 | 27 99
+20: 116 116
+47: 36 36 | 99 99
+49: 123 99
+38: 99 98 | 36 86
+123: 36 36 | 36 99
+48: 36 123 | 99 54
+51: 36 54 | 99 102
+98: 73 99 | 47 36
+26: 20 99 | 34 36
+68: 36 88 | 99 108
+111: 75 36 | 5 99
+54: 99 36 | 99 99
+109: 47 36 | 20 99
+0: 8 11
+17: 36 57 | 99 120
+66: 99 132 | 36 35
+62: 36 130 | 99 32
+59: 36 130 | 99 122
+44: 99 60 | 36 92
+122: 99 36
+74: 126 99 | 16 36
+37: 82 99 | 85 36
+65: 130 36 | 27 99
+80: 58 36 | 43 99
+55: 99 130 | 36 20
+118: 66 36 | 3 99
+5: 24 36 | 124 99
+14: 36 54 | 99 71
+11: 42 31
+96: 40 99 | 61 36
+22: 36 34 | 99 135
+97: 36 27 | 99 20
+43: 99 128 | 36 29
+101: 73 36 | 133 99
+91: 133 36 | 54 99
+114: 36 112 | 99 52
+83: 79 99 | 74 36
+28: 134 99 | 39 36
+72: 99 26 | 36 49
+78: 36 25 | 99 90
+30: 102 99 | 133 36
+27: 99 36 | 36 99
+35: 99 27 | 36 15
+84: 2 36 | 64 99
+75: 1 36 | 119 99
+115: 130 36 | 71 99
+39: 99 84 | 36 121
+40: 99 69 | 36 110
+63: 36 32
+88: 17 99 | 93 36
+120: 53 99 | 55 36
+105: 99 133 | 36 123
+127: 36 123 | 99 47
+134: 99 46 | 36 45
+50: 36 33 | 99 138
+82: 131 99 | 59 36
+104: 122 99 | 27 36
+8: 42
+113: 34 36 | 123 99
+125: 99 123 | 36 54
+64: 54 36
+46: 36 10 | 99 107
+130: 99 36 | 36 116
+18: 36 54 | 99 34
+110: 99 34 | 36 27
+136: 99 15 | 36 73
+132: 122 36 | 133 99
+128: 15 99 | 102 36
+57: 36 56 | 99 67
+100: 99 63 | 36 137
+60: 7 99 | 63 36
+90: 36 122 | 99 133
+41: 34 36
+138: 99 94 | 36 13
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