From 176c75fe292f259913f574b13835e6fb7b1aa494 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Thu, 12 Dec 2024 10:00:57 -0500
Subject: [PATCH] 2024: d12: ex1: add solution

---
 2024/d12/ex1/ex1.py | 67 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100755 2024/d12/ex1/ex1.py

diff --git a/2024/d12/ex1/ex1.py b/2024/d12/ex1/ex1.py
new file mode 100755
index 0000000..f65030c
--- /dev/null
+++ b/2024/d12/ex1/ex1.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+
+import sys
+from collections.abc import Iterator
+from typing import NamedTuple
+
+
+class Point(NamedTuple):
+    x: int
+    y: int
+
+    def neighbours(self) -> Iterator["Point"]:
+        for dx, dy in (
+            (-1, 0),
+            (1, 0),
+            (0, -1),
+            (0, 1),
+        ):
+            yield Point(self.x + dx, self.y + dy)
+
+
+def solve(input: str) -> int:
+    def parse(input: list[str]) -> dict[Point, str]:
+        return {
+            Point(x, y): c for x, line in enumerate(input) for y, c in enumerate(line)
+        }
+
+    def find_plots(garden: dict[Point, str]) -> list[set[Point]]:
+        res: list[set[Point]] = []
+        visited: set[Point] = set()
+
+        for p, plant in garden.items():
+            if p in visited:
+                continue
+            plot: set[Point] = set()
+            to_visit = {p}
+            while to_visit:
+                p = to_visit.pop()
+                visited.add(p)
+                plot.add(p)
+                assert garden[p] == plant  # Sanity check
+                for n in p.neighbours():
+                    if garden.get(n) != plant:
+                        continue
+                    if n in visited:
+                        continue
+                    to_visit.add(n)
+            res.append(plot)
+        return res
+
+    def fence_price(plot: set[Point]) -> int:
+        area = len(plot)
+        perimeter = sum(n not in plot for p in plot for n in p.neighbours())
+        return area * perimeter
+
+    garden = parse(input.splitlines())
+    plots = find_plots(garden)
+    return sum(map(fence_price, plots))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()