80 lines
1.7 KiB
Python
80 lines
1.7 KiB
Python
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#!/usr/bin/env python
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# -*- encoding: utf-8; py-indent-offset: 4 -*-
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# Author: Sebastian Mark
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# CC-BY-SA (https://creativecommons.org/licenses/by-sa/4.0/deed.de)
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# pylint: disable=missing-module-docstring,missing-function-docstring,consider-using-f-string
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import re
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def parse_lock(block: list) -> list:
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lock = [0] * 5
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for y, _ in enumerate(block):
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pins = re.finditer(r"#", block[y])
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for p in pins:
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lock[p.start()] = y
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return lock
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def parse_key(block: list) -> list:
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key = [0] * 5
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for y, _ in enumerate(block):
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pins = re.finditer(r"\.", block[y])
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for p in pins:
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key[p.start()] = len(block) - 2 - y
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return key
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def readinput():
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with open("input", "r", encoding="utf-8") as file:
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schematics = []
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current_schematic = []
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for line in file:
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line = line.rstrip()
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if line:
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current_schematic.append(line)
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else:
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schematics.append(current_schematic)
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current_schematic = []
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schematics.append(current_schematic)
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keys = []
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locks = []
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for schematic in schematics:
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if schematic[0] == "#####":
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locks.append(parse_lock(schematic))
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else:
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keys.append(parse_key(schematic))
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return keys, locks
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def key_fits_lock(key: list, lock: list) -> bool:
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for k, l in zip(key, lock):
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if k + l >= 6:
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return False
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return True
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def main():
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keys, locks = readinput()
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# part 1
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fitting = 0
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for key in keys:
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for lock in locks:
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if key_fits_lock(key, lock):
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fitting += 1
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print("Fitting keys: %d" % fitting)
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if __name__ == "__main__":
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main()
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