78 lines
2.1 KiB
Python
Executable File
78 lines
2.1 KiB
Python
Executable File
#!/usr/bin/env python3.11
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from dataclasses import dataclass
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from typing import List
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from pprint import pprint
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import re
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@dataclass
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class Point:
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x: int
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y: int
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def __hash__(self):
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return (self.x, self.y).__hash__()
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@dataclass
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class Number:
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value: int
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start: Point
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end: Point
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def __hash__(self):
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return (self.value, self.start, self.end).__hash__()
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@dataclass
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class Symbol(Point):
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value: str
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lines = []
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numbers: List[Number] = []
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symbols: List[Symbol] = []
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with open("input.txt") as input:
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lines = input.readlines()
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for line_no, line in enumerate(lines):
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idx = 0
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while match := re.match("\.*(\d+|[^\.\d\n]).*", line[idx:]):
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rec = match.group(1)
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place = line[idx:].find(rec)
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if re.match("\d+", rec):
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number = Number(
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value=int(rec),
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start=Point(x=idx + place, y=line_no),
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end=Point(x=idx + place + len(rec) - 1, y=line_no),
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)
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numbers.append(number)
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# print(number)
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idx += place + len(rec)
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else:
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symbol = Symbol(value=rec, x=idx + place, y=line_no)
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symbols.append(symbol)
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# print(symbol)
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idx += place + 1
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# pprint(numbers)
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# pprint(symbols)
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the_sum = 0
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for line_no in range(len(lines)):
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for symbol in filter(lambda symbol: symbol.y == line_no and symbol.value == "*", symbols):
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# print(symbol.value, end="")
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def selection(number: Number):
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return (
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(number.start.y == line_no - 1 and number.start.x <= symbol.x + 1 and number.end.x >= symbol.x - 1)
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or (number.start.y == line_no + 1 and number.start.x <= symbol.x + 1 and number.end.x >= symbol.x - 1)
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or (number.end.x == symbol.x - 1 and number.end.y == line_no)
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or (number.start.x == symbol.x + 1 and number.start.y == line_no)
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)
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selected = list(filter(selection, numbers))
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if len(selected) == 2:
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# print(symbol, selected)
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the_sum += selected[0].value * selected[1].value
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print(the_sum)
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