day11

day11.py

@@ -0,0 +1,100 @@
+from collections import defaultdict
+from math import lcm
+from tools.aoc import AOCDay
+from typing import Any
+
+
+class Monkey:
+    def __init__(self, monkey_id: int):
+        self.monkey_id = monkey_id
+        self.items = []
+        self.operation = None
+        self.test = None
+        self.action_true = None
+        self.action_false = None
+
+    def turn(self, part2: bool = False):
+        for _ in range(len(self.items)):
+            item = self.items.pop(0)
+            op, right = self.operation
+
+            if op == "+":
+                item += int(right)
+            elif right == "old":
+                item *= item
+            else:
+                item *= int(right)
+
+            if not part2:
+                item //= 3
+
+            if item % self.test == 0:
+                yield item, self.action_true
+            else:
+                yield item, self.action_false
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (10605, "input11_test"),
+            (98280, "input11"),
+        ],
+        [
+            (2713310158, "input11_test"),
+            (17673687232, "input11"),
+        ]
+    ]
+
+    def get_monkeys(self) -> list:
+        monkeys = {}
+        current_monkey = None
+        for line in self.getInput():
+            if not line:
+                continue
+
+            if line.startswith("Monkey"):
+                current_monkey = Monkey(int(line[:-1].split(" ")[1]))
+                monkeys[current_monkey.monkey_id] = current_monkey
+            elif line.startswith("  Starting items:"):
+                current_monkey.items = list(map(int, line.split(": ")[1].split(", ")))
+            elif line.startswith("  Operation"):
+                current_monkey.operation = line.split(": ")[1].split(" = ")[1].split(" ")[1:]
+            elif line.startswith("  Test:"):
+                current_monkey.test = int(line.split(" ")[-1])
+            elif line.startswith("    If true:"):
+                current_monkey.action_true = int(line.split(" ")[-1])
+            elif line.startswith("    If false:"):
+                current_monkey.action_false = int(line.split(" ")[-1])
+            else:
+                print("Don't know how to parse '", line, "'")
+
+        return [monkeys[x] for x in sorted(monkeys)]
+
+    def get_monkey_business(self, amount: int = 20, part2: bool = False) -> int:
+        monkeys = self.get_monkeys()
+        monkey_inspects = defaultdict(int)
+        modder = lcm(*[m.test for m in monkeys])
+
+        for _ in range(amount):
+            for monkey in monkeys:
+                for item, target in monkey.turn(part2):
+                    monkey_inspects[monkey.monkey_id] += 1
+                    if part2:
+                        monkeys[target].items.append(item % modder)
+                    else:
+                        monkeys[target].items.append(item)
+
+        f = sorted(monkey_inspects.values())[-2:]
+        return f[0] * f[1]
+
+    def part1(self) -> Any:
+        return self.get_monkey_business(20, False)
+
+    def part2(self) -> Any:
+        return self.get_monkey_business(10_000, True)
+
+
+if __name__ == '__main__':
+    day = Day(2022, 11)
+    day.run(verbose=True)

inputs/input11

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 56, 52, 58, 96, 70, 75, 72
+  Operation: new = old * 17
+  Test: divisible by 11
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 75, 58, 86, 80, 55, 81
+  Operation: new = old + 7
+  Test: divisible by 3
+    If true: throw to monkey 6
+    If false: throw to monkey 5
+
+Monkey 2:
+  Starting items: 73, 68, 73, 90
+  Operation: new = old * old
+  Test: divisible by 5
+    If true: throw to monkey 1
+    If false: throw to monkey 7
+
+Monkey 3:
+  Starting items: 72, 89, 55, 51, 59
+  Operation: new = old + 1
+  Test: divisible by 7
+    If true: throw to monkey 2
+    If false: throw to monkey 7
+
+Monkey 4:
+  Starting items: 76, 76, 91
+  Operation: new = old * 3
+  Test: divisible by 19
+    If true: throw to monkey 0
+    If false: throw to monkey 3
+
+Monkey 5:
+  Starting items: 88
+  Operation: new = old + 4
+  Test: divisible by 2
+    If true: throw to monkey 6
+    If false: throw to monkey 4
+
+Monkey 6:
+  Starting items: 64, 63, 56, 50, 77, 55, 55, 86
+  Operation: new = old + 8
+  Test: divisible by 13
+    If true: throw to monkey 4
+    If false: throw to monkey 0
+
+Monkey 7:
+  Starting items: 79, 58
+  Operation: new = old + 6
+  Test: divisible by 17
+    If true: throw to monkey 1
+    If false: throw to monkey 5

inputs/input11_test

@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1