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aoc2022/d11.py
2023-12-07 23:57:09 -05:00

144 lines
4.2 KiB
Python

import re
from string import ascii_lowercase, ascii_uppercase
def extract_single_digit(line: str) -> int:
r = re.compile(r"\d+")
for m in r.findall(line):
return int(m)
raise Exception("No single digit sequence in '{line}'")
def extract_digits_list(line: str) -> list[int]:
r = re.compile(r"\d+")
return list(map(int, r.findall(line)))
EXAMPLE = """
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
"""
def clean(text: str) -> list[str]:
return list(filter(lambda l: l.strip() != "", text.splitlines()))
def get_monkesy(lines):
monkeys = []
for i, line in enumerate(lines):
if line.startswith("Monkey"):
d = extract_single_digit(line)
monkeys.append([d])
elif line.strip().startswith("Starting"):
d = extract_digits_list(line)
monkeys[-1].append(d)
elif line.strip().startswith("Operation"):
if "old * old" in line:
f = lambda y: y * y
monkeys[-1].append(f)
elif "*" in line:
d = extract_single_digit(line)
f = lambda x: (lambda y: x * y)
f = f(d)
monkeys[-1].append(f)
elif "+" in line:
d = extract_single_digit(line)
f = lambda x: (lambda y: x + y)
f = f(d)
monkeys[-1].append(f)
else:
raise Exception(line)
elif line.strip().startswith("Test"):
d = extract_single_digit(line)
monkeys[-1].append(d)
elif line.strip().startswith("If true"):
d = extract_single_digit(line)
monkeys[-1].append(d)
elif line.strip().startswith("If false"):
d = extract_single_digit(line)
monkeys[-1].append(d)
else:
print(line)
raise Exception("Unexpected line.")
for m in monkeys:
m.append(0)
return monkeys
def solve(lines: list[str]):
monkeys = get_monkesy(lines)
for _ in range(20):
for monkey in monkeys:
id, items, op, test, if_true, if_false, count = monkey
while items:
item = items.pop()
monkey[6] += 1
worry = item
worry = op(worry)
worry //= 3
if worry % test == 0:
monkeys[if_true][1].append(worry)
else:
monkeys[if_false][1].append(worry)
monkeys[id][1] = monkeys[id][1][1:]
counts = sorted([m[6] for m in monkeys])[-2:]
return counts[0] * counts[1]
def solve2(lines: list[str]):
monkeys = get_monkesy(lines)
mod = 1
for m in monkeys:
mod *= m[3]
for _ in range(10000):
for monkey in monkeys:
id, items, op, test, if_true, if_false, count = monkey
for item in list(items):
monkey[6] += 1
worry = item
worry = op(worry)
worry %= mod
if worry % test == 0:
monkeys[if_true][1].append(worry)
else:
monkeys[if_false][1].append(worry)
monkeys[id][1] = monkeys[id][1][1:]
counts = sorted([m[6] for m in monkeys])[-2:]
return counts[0] * counts[1]
def main():
example = clean(EXAMPLE)
print("Example 1:", solve(example))
data = clean(open("i11.txt").read())
print("Solution 1:", solve(data))
example = clean(EXAMPLE)
print("Example 2:", solve2(example))
data = clean(open("i11.txt").read())
print("Solution 2:", solve2(data))
if __name__ == "__main__":
main()