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46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
from collections import Counter
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from typing import Tuple
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def main(filename: str, expected_part_1: int = None, expected_part_2: int = None):
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counter_part_1 = 0
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counter_part_2 = 0
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with open(filename) as f:
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for line in f:
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if is_valid_part_1(*extract_password_and_policy(line)):
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counter_part_1 += 1
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if is_valid_part_2(*extract_password_and_policy(line)):
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counter_part_2 += 1
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print(f"Part1: Found {counter_part_1} valid passwords.")
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print(f"Part2: Found {counter_part_2} valid passwords.")
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if expected_part_1:
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assert counter_part_1 == expected_part_1
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if expected_part_2:
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assert counter_part_2 == expected_part_2
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def extract_password_and_policy(line) -> Tuple[Tuple[int, int], str, str]:
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policy, password = line.strip().split(": ")
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range_, letter = policy.split(" ")
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range_ = range_.split("-")
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range_ = int(range_[0]), int(range_[1])
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return range_, letter, password
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def is_valid_part_1(range_: Tuple[int, int], letter: str, password: str):
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counter = Counter(password)
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return range_[0] <= counter[letter] <= range_[1]
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def is_valid_part_2(range_: Tuple[int, int], letter: str, password: str):
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first_index = password[range_[0] - 1]
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second_index = password[range_[1] - 1]
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return first_index != second_index and (
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first_index == letter or second_index == letter
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)
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if __name__ == "__main__":
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main("inputs/day02-tests", 2, 1)
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main("inputs/day02")
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