mirror of
https://github.com/Crocmagnon/advent-of-code.git
synced 2024-11-05 06:14:01 +01:00
96 lines
2.7 KiB
Python
96 lines
2.7 KiB
Python
from __future__ import annotations
|
|
|
|
import ast
|
|
from functools import cmp_to_key
|
|
|
|
|
|
def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
|
|
print(f"\n+ Running on {filename}")
|
|
with open(filename) as f:
|
|
data = f.read().strip().split("\n\n")
|
|
|
|
data = parse_data(data)
|
|
solution_part_1 = solve_part_1(data)
|
|
|
|
print(f"1. Found {solution_part_1}")
|
|
if expected_part_1:
|
|
assert expected_part_1 == solution_part_1
|
|
|
|
solution_part_2 = solve_part_2(data)
|
|
print(f"2. Found {solution_part_2}")
|
|
if expected_part_2:
|
|
assert expected_part_2 == solution_part_2
|
|
|
|
|
|
DataType = list[tuple[list, list]]
|
|
|
|
|
|
def parse_data(data: list[str]) -> DataType:
|
|
pairs = []
|
|
for pair in data:
|
|
left, right = pair.split("\n")
|
|
left = ast.literal_eval(left)
|
|
right = ast.literal_eval(right)
|
|
pairs.append((left, right))
|
|
return pairs
|
|
|
|
|
|
def solve_part_1(data: DataType) -> int:
|
|
total = 0
|
|
for index, pair in enumerate(data):
|
|
left, right = pair
|
|
if lower_than(left, right):
|
|
total += index + 1
|
|
return total
|
|
|
|
|
|
def lower_than(left: list, right: list) -> bool | None: # noqa: C901
|
|
"""True if left is lower than right."""
|
|
for left_item, right_item in zip(left, right):
|
|
if isinstance(left_item, int) and isinstance(right_item, int):
|
|
if left_item < right_item:
|
|
return True
|
|
elif left_item > right_item:
|
|
return False
|
|
|
|
elif isinstance(left_item, list) and isinstance(right_item, list):
|
|
if (res := lower_than(left_item, right_item)) is not None:
|
|
return res
|
|
|
|
elif isinstance(left_item, int):
|
|
if (res := lower_than([left_item], right_item)) is not None:
|
|
return res
|
|
|
|
elif isinstance(right_item, int):
|
|
if (res := lower_than(left_item, [right_item])) is not None:
|
|
return res
|
|
|
|
if len(left) == len(right):
|
|
return None
|
|
return len(left) < len(right)
|
|
|
|
|
|
def cmp(left: list, right: list) -> int:
|
|
if lower_than(left, right):
|
|
return -1
|
|
else:
|
|
return 1
|
|
|
|
|
|
def solve_part_2(data: DataType) -> int:
|
|
dividers = [[[2]], [[6]]]
|
|
packets = dividers[::]
|
|
for left, right in data:
|
|
packets.append(left)
|
|
packets.append(right)
|
|
packets.sort(key=cmp_to_key(cmp))
|
|
indices = []
|
|
for index, packet in enumerate(packets):
|
|
if packet in dividers:
|
|
indices.append(index + 1)
|
|
return indices[0] * indices[1]
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main("inputs/day13-test1", expected_part_1=13, expected_part_2=140)
|
|
main("inputs/day13", expected_part_1=5503, expected_part_2=20952)
|