51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
import { readFileSync } from "fs";
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const input = readFileSync("monkeys.txt", "utf-8");
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function resolveOperation(num, oper) {
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oper = oper.split(" = ")[1];
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if(oper.includes("+")) {
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const number = oper.split(" + ")[1];
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num += number.includes("old") ? num : parseInt(number);
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} else {
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const number = oper.split(" * ")[1];
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num *= number.includes("old") ? num : parseInt(number);
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}
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return num;
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}
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const monkeys = [];
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let monkey = {};
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input.split('\n').forEach(line => {
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if(line.startsWith("Monkey ")) monkey.number = parseInt(line.split(" ")[1][0]);
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if(line.startsWith(" Starting items: ")) monkey.items = line.split(": ")[1].split(', ').slice().map(x => parseInt(x));
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if(line.startsWith(" Operation: ")) monkey.operation = line.split(": ")[1];
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if(line.startsWith(" Test: ")) monkey.divisibleBy = parseInt(line.split(" divisible by ")[1]);
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if(line.startsWith(" If true: ")) monkey.ifTrue = parseInt(line.split(" throw to monkey ")[1]);
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if(line.startsWith(" If false: ")) {
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monkey.ifFalse = parseInt(line.split(" throw to monkey ")[1]);
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monkey.itemsInspected = 0;
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monkeys.push(monkey);
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monkey = {};
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}
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});
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for(let i = 0; i < 20; i++) {
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monkeys.forEach(m => {
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while(m.items.length > 0) {
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m.itemsInspected++;
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let worry = resolveOperation(m.items[0], m.operation);
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worry = Math.floor(worry / 3);
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m.items.splice(0, 1);
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if(worry % m.divisibleBy === 0) monkeys[m.ifTrue].items.push(worry);
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else monkeys[m.ifFalse].items.push(worry);
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}
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});
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}
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const findMaxArray = monkeys.map(m => m.itemsInspected).sort((a, b) => a - b);
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const monkeyBusiness = findMaxArray.pop() * findMaxArray.pop();
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console.log(monkeyBusiness) |