72 lines
1.6 KiB
JavaScript
72 lines
1.6 KiB
JavaScript
import * as R from "remeda";
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import { readFile } from "../05/part1.js";
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function parseMonkey(block) {
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const re = new RegExp(
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`Starting items: (?<items>.+)
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Operation: new = (?<operation>.+)
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Test: divisible by (?<divisible>\\d+)
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If true: throw to monkey (?<ifTrue>\\d+)
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If false: throw to monkey (?<ifFalse>\\d+)`,
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"s"
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);
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const groups = { ...block.match(re).groups };
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["divisible", "ifTrue", "ifFalse"].forEach(
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(k) => (groups[k] = parseInt(groups[k]))
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);
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groups.operation = eval("(old) => " + groups.operation);
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groups.items = groups.items.split(", ").map((x) => parseInt(x));
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return { ...groups, inspections: 0 };
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}
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const readInput = (...args) =>
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R.pipe(
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readFile(...args),
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(lines) => lines.split("\n\n"),
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R.compact, // remove last line
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R.map(parseMonkey)
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);
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export const puzzleInput = readInput(import.meta.url, "input");
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export const sample = readInput(import.meta.url, "sample");
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const playTurn = (monkeys, monkey) => {
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monkey.inspections += monkey.items.length;
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monkey.items = monkey.items.map((i) => monkey.operation(i));
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monkey.items = monkey.items.map((i) => Math.floor(i / 3));
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monkey.items.forEach((i) => {
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monkeys[i % monkey.divisible ? monkey.ifFalse : monkey.ifTrue].items.push(
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i
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);
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});
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monkey.items = [];
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return;
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};
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const playRound = (monkeys) => {
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monkeys.forEach((monkey) => playTurn(monkeys, monkey));
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return monkeys;
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};
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export default R.createPipe(
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R.clone,
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(monkeys) => R.times(20, () => playRound(monkeys)),
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R.last(),
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R.map(R.prop("inspections")),
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R.sortBy(R.identity),
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R.reverse,
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R.take(2),
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R.reduce((a, b) => a * b, 1)
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);
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