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| -rw-r--r-- | 3.in | 1000 | ||||
| -rw-r--r-- | 3.py | 48 |
2 files changed, 1048 insertions, 0 deletions
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+011111111001 +000100110011 +001011001011 +110101100000 +101111111011 +001101111101 +100110100011 @@ -0,0 +1,48 @@ +from typing import Generator +from collections.abc import Iterable +from collections import Counter + +Bits = tuple[bool, ...] +Input = list[Bits] + +def column(rows: Iterable[Bits], n: int) -> Generator[bool, None, None]: + for row in rows: + yield row[n] + +def most_common(bits: Iterable[bool]) -> bool: + freqs: list[tuple[bool, int]] = Counter(bits).most_common() + if freqs[0][1] == freqs[1][1]: + return True + return freqs[0][0] + +def bits_to_int(bits: Bits) -> int: + ret: int = 0 + for i, b in enumerate(reversed(bits)): + if b: + ret += 2 ** i + return ret + +def part1(nums: Input) -> int: + nbits: int = len(nums[0]) + gamma: Bits = tuple(most_common(column(inp, i)) for i in range(nbits)) + epsilon: Bits = tuple(not bit for bit in gamma) + return bits_to_int(gamma) * bits_to_int(epsilon) + +def part2_impl(nums: Input, complement: bool, bit: int = 0) -> Bits: + if len(nums) == 1: + return nums[0] + target: bool = most_common(column(nums, bit)) + if complement: + target = not target + nums = list(filter(lambda n: n[bit] == target, nums)) + return part2_impl(nums, complement, bit + 1) + +def part2(nums: Input) -> int: + oxygen: Bits = part2_impl(nums, False) + co2: Bits = part2_impl(nums, True) + return bits_to_int(oxygen) * bits_to_int(co2) + +inp: Input = [tuple(bool(int(c)) for c in l.strip()) for l in open('3.in')] + +print(part1(inp)) +print(part2(inp)) |