From 5b317570bb021378025e59f7c11b188a0d9d834a Mon Sep 17 00:00:00 2001
From: Stefan Harmuth <pennywise@drock.de>
Date: Mon, 30 Dec 2024 08:05:06 +0100
Subject: [PATCH] day13

---
 day13.py            | 67 +++++++++++++++++++++++++++++++++++++++++++++
 inputs/input13      |  1 +
 inputs/input13_test |  1 +
 3 files changed, 69 insertions(+)
 create mode 100644 day13.py
 create mode 100644 inputs/input13
 create mode 100644 inputs/input13_test

diff --git a/day13.py b/day13.py
new file mode 100644
index 0000000..f5f817a
--- /dev/null
+++ b/day13.py
@@ -0,0 +1,67 @@
+from collections import deque
+
+from tools.aoc import AOCDay
+from typing import Any
+
+from tools.coordinate import Coordinate
+from tools.grid import Grid
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (11, "input13_test"),
+            (92, "input13"),
+        ],
+        [
+            (124, "input13"),
+        ],
+    ]
+
+    def get_grid(self) -> Grid:
+        grid = Grid()
+        fav_number = self.getIntsFromInput()[0]
+        for x in range(50):
+            for y in range(50):
+                room_number = x * x + 3 * x + 2 * x * y + y + y * y + fav_number
+                set_bits = list(bin(room_number)[2:]).count("1")
+                if set_bits % 2 == 0:
+                    grid.set(Coordinate(x, y))
+
+        return grid
+
+    def run_maze(self) -> tuple[int, int] | None:
+        if self.is_test():
+            target = Coordinate(7, 4)
+        else:
+            target = Coordinate(31, 39)
+
+        grid = self.get_grid()
+        pos = Coordinate(1, 1)
+        q = deque([(0, pos)])
+        seen = set()
+        rooms_reached = 0
+        while q:
+            dist, pos = q.popleft()
+            if pos == target:
+                return dist, rooms_reached
+            if pos in seen:
+                continue
+            seen.add(pos)
+            if dist <= 50:
+                rooms_reached += 1
+            for n in grid.getNeighboursOf(pos, includeDiagonal=False):
+                q.append((dist + 1, n))
+
+        return None
+
+    def part1(self) -> Any:
+        return self.run_maze()[0]
+
+    def part2(self) -> Any:
+        return self.run_maze()[1]
+
+
+if __name__ == "__main__":
+    day = Day(2016, 13)
+    day.run(verbose=True)
diff --git a/inputs/input13 b/inputs/input13
new file mode 100644
index 0000000..dda5087
--- /dev/null
+++ b/inputs/input13
@@ -0,0 +1 @@
+1350
diff --git a/inputs/input13_test b/inputs/input13_test
new file mode 100644
index 0000000..9a03714
--- /dev/null
+++ b/inputs/input13_test
@@ -0,0 +1 @@
+10
\ No newline at end of file