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