mirror of
https://github.com/Crocmagnon/advent-of-code.git
synced 2024-05-04 02:45:11 +02:00
138 lines
4.4 KiB
Python
138 lines
4.4 KiB
Python
import functools
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import re
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from collections.abc import Iterable
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from typing import Union
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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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instructions = f.read().strip().split("\n")
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program = ProgramPart1(instructions)
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program.run()
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counter_part_1 = program.compute_memory_sum()
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print(f"1. Found {counter_part_1}")
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if expected_part_1:
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assert expected_part_1 == counter_part_1
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program = ProgramPart2(instructions)
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program.run()
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counter_part_2 = program.compute_memory_sum()
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print(f"2. Found {counter_part_2}")
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if expected_part_2:
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assert expected_part_2 == counter_part_2
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Memory = dict[Union[str, int], Union[str, int]]
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class Program:
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def __init__(self, instructions: Iterable[str]):
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self.memory = dict() # type: Memory
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self.instructions = instructions
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self.mem_line_regex = re.compile(r"^mem\[(?P<address>\d+)] = (?P<value>\d+)$")
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def run(self):
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for line in self.instructions:
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self.run_line(line)
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def compute_memory_sum(self):
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raise NotImplementedError
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def run_line(self, line: str):
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if "mask" in line:
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self.update_mask(line)
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else:
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self.update_memory(line)
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def update_mask(self, line: str):
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self.mask = line.split(" = ")[1]
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def update_memory(self, line: str):
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raise NotImplementedError
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class ProgramPart1(Program):
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def __init__(self, instructions: Iterable[str]):
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super().__init__(instructions)
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self.mask = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
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def compute_memory_sum(self):
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int_base_2 = functools.partial(int, base=2)
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return sum(map(int_base_2, self.memory.values()))
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def update_memory(self, line: str):
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match = self.mem_line_regex.match(line)
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if not match:
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raise RuntimeError("Memory line regex doesn't match")
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groups = match.groupdict()
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address = groups["address"]
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value = int(groups["value"])
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self.memory[address] = self.get_masked_value(value)
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def get_masked_value(self, value: int) -> str:
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binary_value = f"{value:036b}"
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masked_value = []
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for binary_bit, mask_bit in zip(binary_value, self.mask):
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if mask_bit == "X":
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masked_value.append(binary_bit)
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else:
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masked_value.append(mask_bit)
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return "".join(masked_value)
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class ProgramPart2(Program):
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def __init__(self, instructions: Iterable[str]):
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super().__init__(instructions)
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self.mask = "000000000000000000000000000000000000"
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def compute_memory_sum(self):
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return sum(self.memory.values())
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def update_memory(self, line: str):
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match = self.mem_line_regex.match(line)
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if not match:
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raise RuntimeError("Memory line regex doesn't match")
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groups = match.groupdict()
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address = int(groups["address"])
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value = int(groups["value"])
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for masked_address in self.get_masked_addresses(address):
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self.memory[masked_address] = value
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def get_masked_addresses(self, address: int) -> Iterable[int]:
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binary_address = f"{address:036b}"
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corrected_binary_address = ""
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for binary_bit, mask_bit in zip(binary_address, self.mask):
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if mask_bit == "1":
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corrected_binary_address += "1"
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else:
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corrected_binary_address += binary_bit
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addresses = self.get_floating_addresses("", corrected_binary_address, self.mask)
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int_base_2 = functools.partial(int, base=2)
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return map(int_base_2, addresses)
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def get_floating_addresses(self, prefix: str, address: str, mask: str) -> list[str]:
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if "X" not in mask:
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return [prefix + address]
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first_x = mask.index("X")
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collector = []
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new_address = address[first_x + 1 :]
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new_prefix = prefix + address[:first_x]
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new_mask = mask[first_x + 1 :]
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collector.extend(
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self.get_floating_addresses(new_prefix + "0", new_address, new_mask)
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)
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collector.extend(
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self.get_floating_addresses(new_prefix + "1", new_address, new_mask)
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)
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return collector
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if __name__ == "__main__":
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# main("inputs/day14-test1", 165) # too slow for part 2
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main("inputs/day14-test2", 51, 208)
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main("inputs/day14", 6559449933360, 3369767240513)
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