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# -*- coding: utf-8 -*-
from abc import ABC
from typing import Iterator, Any, List
from aoc import BaseAssignment
class Assignment(BaseAssignment):
trees: List[str]
def row_at(self, y: int) -> List[int]:
return [int(i) for i in self.trees[y]]
def col_at(self, x: int) -> List[int]:
return [int(i[x]) for i in self.trees]
class AssignmentOne(Assignment):
example_result = 21
def is_visible(self, trees: List[int], index: int) -> bool:
highest_first_half = max(trees[:index])
highest_second_half = max(trees[index + 1 :])
value = trees[index]
return highest_first_half < value or highest_second_half < value
def tree_visible(self, x: int, y: int) -> bool:
col = self.col_at(x)
row = self.row_at(y)
return self.is_visible(col, y) or self.is_visible(row, x)
def run(self, input: Iterator) -> Any:
self.trees = list(input)
width = len(self.trees[0])
height = len(self.trees)
visible_inside = 0
self.is_visible(self.col_at(1), 2)
for x in range(1, width - 1):
for y in range(1, height - 1):
if self.tree_visible(x, y):
visible_inside += 1
return visible_inside + ((width - 1) * 2) + ((height - 1) * 2)
class AssignmentTwo(Assignment):
example_result = 8
@staticmethod
def calculate_1d_scenic_score(trees: List[int], index: int) -> int:
first_half = list(reversed(trees[:index]))
second_half = trees[index + 1 :]
value = trees[index]
score_first_half = 0
for score_first_half, tree in enumerate(first_half):
if tree >= value:
break
score_second_half = 0
for score_second_half, tree in enumerate(second_half):
if tree >= value:
break
return (score_first_half + 1) * (score_second_half + 1)
def calculate_scenic_score(self, x: int, y: int) -> int:
col = self.col_at(x)
row = self.row_at(y)
return self.calculate_1d_scenic_score(col, y) * self.calculate_1d_scenic_score(
row, x
)
def run(self, input: Iterator) -> Any:
self.trees = list(input)
width = len(self.trees[0])
height = len(self.trees)
scenic_scores: List[int] = []
for x in range(1, width - 1):
for y in range(1, height - 1):
scenic_score = self.calculate_scenic_score(x, y)
scenic_scores.append(scenic_score)
return max(scenic_scores)
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