66 lines
1.5 KiB
Python
66 lines
1.5 KiB
Python
from pathlib import Path
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from typing import Generator, TypeVar
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from collections.abc import Iterable
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T = TypeVar("T")
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def threes(i: Iterable[T]) -> Generator[tuple[T, T, T], None, None]:
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if len(i) % 3 != 0:
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raise ValueError()
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for idx in range(0, len(i), 3):
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yield i[idx], i[idx + 1], i[idx + 2]
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def priority(s: str) -> int:
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assert len(s) == 1
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if "a" <= s <= "z":
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return ord(s) - ord("a") + 1
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elif "A" <= s <= "Z":
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return ord(s) - ord("A") + 27
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raise RuntimeError(f"Invalid char: {s}")
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def split(s: str) -> tuple[str, str]:
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mid = len(s) // 2
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return s[:mid], s[mid:]
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def part1(data: str) -> int:
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result = 0
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for line in data.splitlines():
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left, right = split(line)
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both = {ch for ch in right}.intersection({ch for ch in left})
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value = 0
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for ch in both:
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value += priority(ch)
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print(f"{line}: {both}")
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result += value
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return result
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def part2(data: str) -> int:
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result = 0
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lines = data.splitlines()
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for a, b, c in threes(lines):
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badge = set(a).intersection(set(b)).intersection(set(c))
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value = 0
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for ch in badge:
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value += priority(ch)
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result += value
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return result
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# Setup
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data = (Path(__file__).parents[1] / "input").read_text()
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# Problem solving - part 1
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result = part1(data)
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print(f"Part 1 solution: {result}")
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# Problem solving - part 2
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result = part2(data)
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print(f"Part 2 solution: {result}")
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