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79 lines
1.9 KiB
Python
79 lines
1.9 KiB
Python
#!/usr/bin/env python
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from dataclasses import dataclass
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from functools import reduce
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from os.path import dirname, join
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# Day 08
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# Common
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def read_input(filename):
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data = join(dirname(__file__), '..', filename)
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with open(data) as f:
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return f.read().strip()
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test = read_input('test.txt')
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data = read_input('input.txt')
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@dataclass
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class Forest:
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grid: list[list[int]]
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size: int
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def is_tree_visible(self, y: int, x: int) -> tuple[bool, int]:
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value = self.grid[y][x]
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combinations = [(0, 1), (0, -1), (1, 0), (-1, 0)]
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visible = 4
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views: list[int] = []
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for dy, dx in combinations:
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X = x
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Y = y
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view = 0
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while True:
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X += dx
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Y += dy
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# Gone outside the forest, so must be visible
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if Y < 0 or Y == self.size or X < 0 or X == self.size:
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break
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view += 1
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if value <= self.grid[Y][X]:
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visible -= 1
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break
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views.append(view)
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score = reduce(lambda a, b: a*b, views, 1)
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return visible > 0, score
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def analyze(self) -> tuple[int, int]:
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visible = 0
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best = 0
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for y in range(self.size):
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for x in range(self.size):
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is_visible, score = self.is_tree_visible(y, x)
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if is_visible:
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visible += 1
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if score > best:
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best = score
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return visible, best
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@staticmethod
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def parse(data: str):
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lines = data.split()
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size = len(lines)
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grid = [
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[int(lines[y][x]) for x in range(size)]
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for y in range(size)
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]
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return Forest(grid, size)
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forest = Forest.parse(test)
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print(forest.analyze())
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forest = Forest.parse(data)
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print(forest.analyze())
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