72 lines
1.6 KiB
JavaScript
72 lines
1.6 KiB
JavaScript
const fs = require('fs/promises');
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const main = async () => {
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const input = (await fs.readFile("./input.txt", 'utf8')).split("\n\n");
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const getItem = (itemStr) => {
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const val = parseFloat(itemStr);
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const remainders = Array.from(Array(19).keys()).map((_, i) => val % (i + 1));
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const isDivisibleBy = (n) => remainders[n - 1] === 0;
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const inspect = str => {
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remainders.forEach((rem, i) => {
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const div = i + 1;
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remainders[i] = eval(`const old = ${rem}; const _${str}; _new;`) % div;
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});
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};
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return {
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isDivisibleBy,
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inspect
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};
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};
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const getMonkey = (str) => {
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const rows = str.split("\n").slice(1).map(r => r.split(": ")[1]);
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const items = rows[0].split(", ").map(getItem);
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const inspectOp = rows[1];
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const testDiv = parseFloat(rows[2].split(" ")[2]);
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const trueTarget = rows[3][rows[3].length - 1];
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const falseTarget = rows[4][rows[4].length - 1];
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let inspectCount = 0;
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const takeTurn = () => {
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while(items.length) {
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inspectCount++;
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const item = items.shift();
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item.inspect(inspectOp);
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monkeyData[item.isDivisibleBy(testDiv) ? trueTarget : falseTarget].addItem(item);
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}
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}
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const addItem = (item) => items.push(item);
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return {
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takeTurn,
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addItem,
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getCount: () => inspectCount
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};
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};
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const monkeyData = input.map(getMonkey);
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for (let i = 0; i < 10000; ++i) {
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monkeyData.forEach(m => m.takeTurn());
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}
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const counts = monkeyData.map(m => m.getCount()).sort((a, b) => b - a);
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console.log(counts[0] * counts[1]);
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}
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main();
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