82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
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const { Glib, Maps } = require('../../lib');
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const parse = (input) => {
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return new Glib(
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(function*() {
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let current = null;
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let awake = true;
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for (const line of Glib.fromLines(input).array.sort()) {
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const [datePortion, actionPortion] = line.split('] ');
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if (actionPortion.endsWith('begins shift')) {
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if (current != null) {
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yield current;
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current = null;
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}
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current = {
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guard: BigInt(actionPortion.split(' ')[1].slice(1)),
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schedule: [],
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};
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awake = true;
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} else if (actionPortion === 'wakes up') {
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if (awake) {
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continue;
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}
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awake = true;
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current.schedule.push(BigInt(datePortion.split(':')[1]));
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} else if (actionPortion === 'falls asleep') {
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if (!awake) {
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continue;
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}
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awake = false;
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current.schedule.push(BigInt(datePortion.split(':')[1]));
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} else {
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throw new Error('bad line');
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}
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}
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yield current;
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})(),
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);
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};
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module.exports = {
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'1': (input) => {
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input = parse(input).array;
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const chosen = input.glib
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.map(({ guard, schedule }) => [
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guard,
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schedule.glib
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.chunk(2)
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.map(([a, b]) => b - a)
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.sum(),
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])
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.reduce((a, pair) => Maps.add(a, new Map([pair])), new Map())
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.glibEntries.reduce((a, b) => (a[1] > b[1] ? a : b))[0];
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return (
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chosen *
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input.glib
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.filter(({ guard }) => guard === chosen)
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.flatMap(({ schedule }) =>
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schedule.glib
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.chunk(2)
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.flatMap(([start, end]) => Glib.fromSequence(start, end - 1n)),
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)
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.frequency()
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.glibEntries.reduce((a, b) => (a[1] > b[1] ? a : b))[0]
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);
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},
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2: (input) =>
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parse(input)
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.flatMap(({ guard, schedule }) =>
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schedule.glib
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.chunk(2)
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.flatMap(([start, end]) => Glib.fromSequence(start, end - 1n))
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.map((minute) => `${guard},${minute}`),
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)
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.frequency()
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.glibEntries.reduce((a, b) => (a[1] > b[1] ? a : b))[0]
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.split(',')
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.glib.toInts()
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.product(),
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};
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