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Solve 2020/19

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This commit is contained in:
Alfred Melch 2020-12-21 13:44:25 +01:00
parent f18d58cfeb
commit 171d55e87a
5 changed files with 686 additions and 0 deletions
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12
2020/19/example Normal file
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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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42: 9 14 | 10 1
9: 14 27 | 1 26
10: 23 14 | 28 1
1: "a"
11: 42 31
5: 1 14 | 15 1
19: 14 1 | 14 14
12: 24 14 | 19 1
16: 15 1 | 14 14
31: 14 17 | 1 13
6: 14 14 | 1 14
2: 1 24 | 14 4
0: 8 11
13: 14 3 | 1 12
15: 1 | 14
17: 14 2 | 1 7
23: 25 1 | 22 14
28: 16 1
4: 1 1
20: 14 14 | 1 15
3: 5 14 | 16 1
27: 1 6 | 14 18
14: "b"
21: 14 1 | 1 14
25: 1 1 | 1 14
22: 14 14
8: 42
26: 14 22 | 1 20
18: 15 15
7: 14 5 | 1 21
24: 14 1
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505
2020/19/input Normal file
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42: 16 112 | 89 39
120: 89 40 | 16 109
30: 40 16 | 26 89
2: 133 89 | 137 16
15: 94 16 | 92 89
8: 42
134: 40 87
23: 89 47 | 16 12
78: 102 89 | 26 16
119: 115 89 | 5 16
11: 42 31
67: 89 63 | 16 18
82: 16 40 | 89 63
88: 16 16 | 89 89
97: 89 110 | 16 78
85: 60 16 | 55 89
3: 40 16 | 121 89
132: 92 16 | 98 89
77: 16 97 | 89 58
72: 89 16 | 16 16
27: 16 99 | 89 48
50: 108 89 | 132 16
53: 16 45 | 89 131
70: 87 87
36: 89 26 | 16 63
65: 16 88 | 89 100
38: 88 16 | 44 89
25: 16 109 | 89 63
81: 89 61 | 16 3
136: 16 100
104: 92 16 | 100 89
115: 26 16 | 100 89
45: 16 70 | 89 121
63: 16 89 | 89 87
92: 16 16 | 16 89
130: 89 72 | 16 102
105: 118 16 | 23 89
34: 16 1 | 89 117
83: 67 89 | 136 16
26: 89 89 | 16 87
116: 16 29 | 89 77
29: 68 16 | 111 89
10: 89 75 | 16 76
64: 16 26 | 89 18
14: 89 62 | 16 113
80: 89 107 | 16 52
35: 16 86 | 89 54
54: 81 16 | 124 89
32: 66 16 | 95 89
61: 98 89 | 70 16
124: 120 16 | 69 89
59: 100 89 | 94 16
17: 89 56 | 16 37
127: 16 20 | 89 126
111: 16 57 | 89 4
58: 33 89 | 103 16
137: 89 100 | 16 109
69: 88 16 | 121 89
109: 89 89 | 16 89
95: 89 10 | 16 53
73: 16 35 | 89 32
114: 94 16 | 109 89
60: 38 16 | 82 89
79: 63 89 | 102 16
12: 89 40 | 16 100
118: 16 114 | 89 59
55: 16 65 | 89 25
21: 16 100 | 89 121
66: 89 50 | 16 41
18: 16 89
6: 130 16 | 101 89
51: 100 16 | 94 89
56: 135 89 | 79 16
135: 89 63 | 16 26
125: 16 64 | 89 15
139: 13 89 | 17 16
20: 18 89 | 44 16
129: 16 128 | 89 49
16: "b"
62: 89 19 | 16 7
5: 70 89 | 26 16
24: 89 127 | 16 80
107: 89 72 | 16 121
108: 16 94 | 89 98
102: 89 89 | 89 16
1: 94 89 | 109 16
19: 16 93 | 89 27
43: 16 71 | 89 36
117: 16 63 | 89 40
110: 16 121 | 89 92
122: 83 16 | 84 89
37: 30 89 | 21 16
128: 94 16 | 44 89
46: 16 26 | 89 94
7: 119 16 | 28 89
31: 73 16 | 14 89
0: 8 11
44: 89 16 | 16 89
131: 18 16 | 88 89
101: 16 100 | 89 100
133: 89 109 | 16 88
76: 89 72 | 16 44
100: 89 89
93: 16 15 | 89 123
138: 16 90 | 89 122
89: "a"
47: 88 16 | 72 89
96: 89 46 | 16 131
48: 89 18 | 16 72
39: 116 89 | 139 16
103: 109 16 | 100 89
121: 16 16 | 89 87
86: 16 96 | 89 125
123: 88 89 | 100 16
84: 20 89 | 104 16
49: 89 44 | 16 26
4: 26 89 | 109 16
33: 16 72 | 89 26
75: 89 88 | 16 94
28: 126 89 | 76 16
9: 22 16 | 129 89
98: 16 16
68: 16 101 | 89 91
57: 88 16 | 102 89
41: 106 16 | 51 89
87: 16 | 89
112: 74 89 | 138 16
52: 72 16 | 40 89
113: 89 24 | 16 9
99: 109 89 | 26 16
90: 2 89 | 43 16
74: 105 16 | 85 89
106: 89 18 | 16 40
94: 89 16
13: 6 16 | 34 89
91: 16 26
71: 44 89 | 26 16
40: 87 16 | 16 89
126: 89 94 | 16 92
22: 89 75 | 16 134
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baabaabbabbaabbbbbababba
aabbaabbaabbaababbaabaab
ababaaabbabaaaaaaaaaabaa
baabaabbbbaabbbbbbaaaaba
bbbababbbbbabababbbabaabbabaaababaabbaaabbabbbabbbababab
abbbaaaaaaaaabaabbabbbbb
bbbaabbbabbababbbaababaabaaaabaaaaaaabaa
ababbbbababbbbababbbabba
aaaaababbbaabababbabbbaa
aaaaaabbabaaabaababaabaababaabba
babaaaabababbababbbaaaaaabbaabbbaaaabbab
bbbbaaaababaaabababaabba
abbbaabaaaaabbbbabbababa
bbbbabbbbbaababbbabababb
aaaabbaabbbaabbbabbbaaaa
aabaabbabbbbbbaaaaabbaaa
abbaaabbbaaaababaaababbaaaaabaaaaaaabbab
abbaaaaaaaaabaaaababaaabbbaaabaa
ababaabaaabbabaabbbbaaba
bbbbabbbabbabaabbbbabbba

48
2020/19/solution1.js Normal file
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const fs = require("fs");
let [rules, messages] = fs
.readFileSync("input", "utf-8")
.trim()
.split("\n\n")
.map((part) => part.split("\n"));
rules = rules
.map((line) => line.split(": "))
.map(([num, rule]) => [parseInt(num), rule])
.sort((a, b) => a[0] - b[0])
.map(([_, rule]) => rule);
console.log(rules);
console.log("=");
// console.log(messages);
function getRegex(idx) {
const rule = rules[idx];
if (rule.startsWith('"')) {
return rule.slice(1, rule.length - 1);
}
let regex = "";
let multiple = false;
for (const symbol of rule.split(" ")) {
if (symbol === "|") {
regex = "(" + regex + "|";
multiple = true;
} else {
regex = regex + getRegex(parseInt(symbol));
}
}
regex = multiple ? regex + ")" : regex;
rules[idx] = '"' + regex + '"';
return regex;
}
const regex = new RegExp(`^${getRegex(0)}$`);
console.log(rules);
console.log(regex);
let sum = 0;
for (const message of messages) {
if (regex.test(message)) sum++;
}
console.log(sum);

73
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const fs = require("fs");
let [rules, messages] = fs
.readFileSync("input", "utf-8")
.trim()
.split("\n\n")
.map((part) => part.split("\n"));
rules = Object.fromEntries(rules.map((line) => line.split(": ")));
// unecessary, but might reveal an overlooked loop
rules["8"] = "42 | 42 8";
rules["11"] = "42 31 | 42 11 31";
// console.log(rules);
// console.log(messages);
function getRegex(idx, visited = []) {
const rule = rules[idx];
if (rule.startsWith('"')) {
return rule.slice(1, rule.length - 1);
}
let regex = "";
let multiple = false;
for (const symbol of rule.split(" ")) {
if (symbol === "|") {
regex = "(" + regex + "|";
multiple = true;
} else {
regex = regex + getRegex(parseInt(symbol), visited.concat(idx));
}
}
regex = multiple ? regex + ")" : regex;
rules[idx] = '"' + regex + '"';
return regex;
}
// Rule 0 is "8 11"
// These rules are the only looping rules through self referencing
// rule 8: 42 | 42 8
// expects rule 42 one or more times
// rule 11: 42 31 | 42 11 31
// recursively expects R42 R11 R31
// translated:
// expects rule 42 one or more times followed by 31 by the same quantity
// combined:
// rule 0: 8 11
// start of string matches 42 (one or more)
// end of string matches 31 (one or more)
// the quantity of R42 matches has to be more than the quantity of R31
const rule42 = getRegex(42);
const rule31 = getRegex(31);
const possibleEndings = [];
// 10 is a guessed maximum repetition based message length
// if this value is too high the regex wont compile
// for larger messages a recursive approach is necessary
for (let reps = 1; reps <= 10; reps++) {
possibleEndings.push(`((${rule42.repeat(reps)})(${rule31.repeat(reps)}))`);
}
const patternRaw = `^(${rule42})+(${possibleEndings.join("|")})$`;
// console.log("Pattern:", patternRaw);
console.log("Compiling RegExp...");
const pattern = new RegExp(patternRaw);
console.log("done.");
console.log("Checking messages...");
let sum = 0;
for (let message of messages) {
if (pattern.test(message)) sum++;
}
console.log(sum);