jsadvent/solutions/2018/4.js
2020-12-10 02:33:00 -06:00

82 lines
2.2 KiB
JavaScript

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