2020 day 19 part 1

2020/19/part1.js

@@ -0,0 +1,36 @@
+const fs = require('fs');
+const input = fs.readFileSync('./part1input.txt', 'utf-8');
+let rules = new Map();
+input.split('\n\n')[0].split('\n').forEach(line => {
+  parts = line.split(': ');
+  rules.set(parts[0], parts[1].split(' | ').map(o => o.split(' ')));
+});
+let howFar = 0;
+
+function check (str, ruleNum = '0', matchToEnd = true) {
+  if (ruleNum[0] == '"') {
+    return str[howFar++] == ruleNum[1];
+  }
+  let rule = rules.get(ruleNum);
+  for (let pattern of rule) {
+    let before = howFar;
+    let success = true;
+    for (let token of pattern) {
+      let match = check(str, token, false);
+      if (!match) {
+        success = false;
+        break;
+      }
+    }
+    if (matchToEnd?success&&howFar==str.length:success) return true;
+    howFar = before
+  }
+  return false;
+}
+
+let total = 0
+input.split('\n\n')[1].split('\n').forEach(line => {
+  howFar = 0
+  total+=check(line)
+});
+console.log(total)

2020/19/part1input.txt

@@ -0,0 +1,595 @@
+62: 109 24 | 103 36
+9: 75 36 | 67 24
+66: 107 24 | 91 36
+0: 8 11
+44: 24 34 | 36 36
+7: 36 24 | 24 36
+74: 114 36 | 92 24
+128: 36 103
+52: 24 98 | 36 98
+20: 108 24 | 26 36
+75: 114 36 | 125 24
+33: 24 125 | 36 98
+110: 34 124
+102: 24 78 | 36 97
+27: 82 24 | 110 36
+23: 36 100 | 24 3
+43: 57 24 | 103 36
+49: 24 5 | 36 61
+85: 24 6 | 36 93
+71: 60 36 | 90 24
+55: 24 50 | 36 80
+10: 24 65 | 36 64
+16: 33 36 | 132 24
+47: 48 36 | 112 24
+125: 34 34
+8: 42
+14: 24 37 | 36 2
+56: 97 36 | 15 24
+25: 36 127 | 24 38
+100: 24 114 | 36 68
+101: 115 24 | 122 36
+54: 36 98 | 24 92
+60: 34 114
+19: 24 36 | 36 36
+113: 12 36 | 69 24
+29: 109 24 | 125 36
+59: 36 19 | 24 57
+81: 24 109 | 36 124
+119: 36 74 | 24 90
+96: 36 76 | 24 4
+109: 36 34 | 24 36
+93: 36 36
+11: 42 31
+39: 17 24 | 129 36
+132: 36 114 | 24 44
+6: 36 34 | 24 24
+127: 44 24 | 124 36
+114: 24 24 | 24 36
+73: 125 24
+58: 36 51 | 24 40
+21: 23 36 | 56 24
+5: 98 36 | 19 24
+105: 36 103 | 24 92
+38: 93 36 | 92 24
+82: 24 103 | 36 92
+24: "b"
+15: 36 109 | 24 6
+97: 36 44 | 24 7
+50: 98 36 | 124 24
+69: 98 36 | 57 24
+63: 47 24 | 13 36
+48: 24 120 | 36 116
+17: 105 36 | 43 24
+22: 94 36 | 66 24
+95: 36 27 | 24 45
+120: 24 103 | 36 125
+57: 36 36 | 24 24
+99: 24 101 | 36 119
+53: 24 96 | 36 89
+115: 36 98 | 24 114
+103: 24 24
+94: 24 83 | 36 79
+111: 24 19 | 36 93
+123: 36 114 | 24 98
+18: 36 19
+116: 36 125 | 24 93
+79: 24 128 | 36 46
+65: 58 24 | 77 36
+45: 24 117 | 36 88
+91: 24 52 | 36 110
+90: 68 36 | 44 24
+98: 24 36
+106: 24 92
+88: 24 103 | 36 6
+84: 86 24 | 41 36
+78: 24 44 | 36 125
+26: 72 24 | 99 36
+37: 128 24 | 54 36
+130: 24 9 | 36 121
+41: 36 32 | 24 81
+122: 19 36 | 68 24
+1: 24 19 | 36 92
+28: 124 36 | 125 24
+76: 24 92 | 36 93
+77: 55 36 | 131 24
+83: 24 28 | 36 73
+86: 24 116 | 36 123
+2: 104 36 | 33 24
+92: 36 24
+104: 98 24 | 109 36
+32: 24 114 | 36 103
+124: 36 36 | 36 24
+61: 44 36 | 68 24
+35: 36 63 | 24 87
+129: 36 69 | 24 18
+40: 24 29 | 36 30
+31: 10 24 | 118 36
+30: 109 24 | 6 36
+117: 36 109 | 24 114
+89: 36 52 | 24 54
+108: 14 36 | 39 24
+36: "a"
+112: 78 24 | 62 36
+87: 24 53 | 36 95
+51: 100 24 | 30 36
+107: 1 24 | 85 36
+34: 24 | 36
+4: 24 68 | 36 109
+12: 93 24 | 92 36
+67: 36 93 | 24 109
+46: 6 36 | 124 24
+80: 24 57 | 36 68
+13: 16 36 | 71 24
+68: 36 24 | 24 34
+42: 20 24 | 35 36
+131: 24 74 | 36 111
+3: 24 19
+118: 70 24 | 22 36
+64: 21 24 | 126 36
+70: 130 24 | 84 36
+72: 102 24 | 49 36
+121: 106 24 | 59 36
+126: 113 24 | 25 36
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2020/19/test1.txt

@@ -0,0 +1,12 @@
+0: 4 1 5
+1: 2 3 | 3 2
+2: 4 4 | 5 5
+3: 4 5 | 5 4
+4: "a"
+5: "b"
+
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README.md

@@ -59,3 +59,4 @@ if (advent) {
 16. [:star: :star:](https://adventofcode.com/2020/day/16 "see puzzle")
 17. [:star: :star:](https://adventofcode.com/2020/day/17 "see puzzle")
 18. [:star: :star:](https://adventofcode.com/2020/day/18 "see puzzle")
+19. [:star:](https://adventofcode.com/2020/day/19 "see puzzle")