11_1

day11/index.js

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

day11/monkeys.txt

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+Monkey 0:
+  Starting items: 89, 84, 88, 78, 70
+  Operation: new = old * 5
+  Test: divisible by 7
+    If true: throw to monkey 6
+    If false: throw to monkey 7
+
+Monkey 1:
+  Starting items: 76, 62, 61, 54, 69, 60, 85
+  Operation: new = old + 1
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 6
+
+Monkey 2:
+  Starting items: 83, 89, 53
+  Operation: new = old + 8
+  Test: divisible by 11
+    If true: throw to monkey 5
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 95, 94, 85, 57
+  Operation: new = old + 4
+  Test: divisible by 13
+    If true: throw to monkey 0
+    If false: throw to monkey 1
+
+Monkey 4:
+  Starting items: 82, 98
+  Operation: new = old + 7
+  Test: divisible by 19
+    If true: throw to monkey 5
+    If false: throw to monkey 2
+
+Monkey 5:
+  Starting items: 69
+  Operation: new = old + 2
+  Test: divisible by 2
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 6:
+  Starting items: 82, 70, 58, 87, 59, 99, 92, 65
+  Operation: new = old * 11
+  Test: divisible by 5
+    If true: throw to monkey 7
+    If false: throw to monkey 4
+
+Monkey 7:
+  Starting items: 91, 53, 96, 98, 68, 82
+  Operation: new = old * old
+  Test: divisible by 3
+    If true: throw to monkey 4
+    If false: throw to monkey 2