advent-of-code/2022/11/index2.js

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2022-12-11 08:33:42 +00:00
const fs = require('fs/promises');
const main = async () => {
const input = (await fs.readFile("./input.txt", 'utf8')).split("\n\n");
const getItem = (itemStr) => {
const val = parseFloat(itemStr);
const remainders = Array.from(Array(19).keys()).map((_, i) => val % (i + 1));
const isDivisibleBy = (n) => remainders[n - 1] === 0;
const inspect = str => {
remainders.forEach((rem, i) => {
const div = i + 1;
remainders[i] = eval(`const old = ${rem}; const _${str}; _new;`) % div;
});
};
return {
isDivisibleBy,
inspect
};
};
const getMonkey = (str) => {
const rows = str.split("\n").slice(1).map(r => r.split(": ")[1]);
const items = rows[0].split(", ").map(getItem);
const inspectOp = rows[1];
const testDiv = parseFloat(rows[2].split(" ")[2]);
const trueTarget = rows[3][rows[3].length - 1];
const falseTarget = rows[4][rows[4].length - 1];
let inspectCount = 0;
const takeTurn = () => {
while(items.length) {
inspectCount++;
const item = items.shift();
item.inspect(inspectOp);
monkeyData[item.isDivisibleBy(testDiv) ? trueTarget : falseTarget].addItem(item);
}
}
const addItem = (item) => items.push(item);
return {
takeTurn,
addItem,
getCount: () => inspectCount
};
};
const monkeyData = input.map(getMonkey);
for (let i = 0; i < 10000; ++i) {
monkeyData.forEach(m => m.takeTurn());
}
const counts = monkeyData.map(m => m.getCount()).sort((a, b) => b - a);
console.log(counts[0] * counts[1]);
}
main();