Day 1: Report RepairDay 2: Password PhilosophyDay 3: Toboggan TrajectoryDay 4: Passport ProcessingDay 5: Binary BoardingDay 6: Custom CustomsDay 7: Handy HaversacksDay 8: Handheld HaltingDay 9: Encoding ErrorDay 10: Adapter ArrayDay 11: Seating SystemDay 12: Rain RiskDay 13: Shuttle SearchDay 14: Docking DataDay 15: Rambunctious RecitationDay 16: Ticket TranslationDay 17: Conway CubesDay 18: Operation OrderDay 25: Combo BreakerAdvent of Code Leaderboard 2020
Day 19: Monster Messages
parsed = sample2.trim().split('\n\n')
rules = {
const rules = []
function fromList(list) {
const subRules = list.split(" ")
return (msg) => {
for (const r of subRules) {
const [b, left] = rules[r](msg)
if (!b) return [false, left]
msg = left
}
return [true, msg]
}
}
for (const lines of parsed[0].split('\n')) {
const [i, list] = lines.split(': ')
if (list.includes('"')) { // "a"
const [, ch] = list.match(/"([^"]+)"/)
rules[i] = msg => [ msg[0] === ch, msg.slice(1) ]
} else if (list.includes("|")) { // 2 3 | 1 2
const parts = list.split(' | ').map(fromList)
rules[i] = (msg) => parts.map(p => p(msg)).find(p => p[0]) || [false, msg]
} else { // 4 1 5
rules[i] = fromList(list)
}
}
return rules
}
messages = parsed[1].split('\n')
rules[0]('babbbbaabbbbbabbbbbbaabaaabaaa')
rules[8].toString()
part1 = messages.filter(msg => {
const [r, left] = rules[0](msg)
return r && left.length === 0
})
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