day 8

2022/08/README.md

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+# 08
+
+Description
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>1713</li>
+    <li>268464</li>
+  </ol>
+</details>

2022/08/python/main.py

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