Day 8

2 files changed, 80 insertions, 4 deletions

diff --git a/day8/__init__.py b/day8/__init__.py
index 21e18d2..08f9925 100644
--- a/day8/__init__.py
+++ b/day8/__init__.py
@@ -11,17 +11,86 @@ class Assignment(BaseAssignment):
     def row_at(self, y: int) -> List[int]:
         return [int(i) for i in self.trees[y]]
 
-    def col_at(self, x: int):
+    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)
 
-        return ((width - 1) * 2) + ((height - 1) * 2)
+        visible_inside = 0
 
+        self.is_visible(self.col_at(1), 2)
 
-class AssignmentOne(Assignment):
-    example_result = 21
+        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)
diff --git a/day8/test_init.py b/day8/test_init.py
new file mode 100644
index 0000000..6fd0e2b
--- /dev/null
+++ b/day8/test_init.py
@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+from day8 import AssignmentTwo
+
+
+def test_calculate_1d_scenic_score():
+    assert 1 * 2 == AssignmentTwo.calculate_1d_scenic_score([3, 5, 3, 5, 3], 1)
+    assert 1 * 2 == AssignmentTwo.calculate_1d_scenic_score([2, 5, 5, 1, 2], 2)