day14 - p2 even faster

day14.py

@@ -45,6 +45,27 @@ class Day(AOCDay):
         cave.minY = 0
         return cave
 
+    def get_cave_rocks_and_height(self) -> (set, int):
+        rocks = set()
+        max_y = 0
+        for line in self.getInput():
+            corners = [tuple(map(int, c.split(","))) for c in line.split(" -> ")]
+            for i in range(len(corners)):
+                if corners[i][1] > max_y:
+                    max_y = corners[i][1]
+                if i == 0:
+                    continue
+                from_x = corners[i][0] if corners[i][0] < corners[i-1][0] else corners[i-1][0]
+                to_x = (corners[i][0] if corners[i][0] > corners[i-1][0] else corners[i-1][0]) + 1
+                from_y = corners[i][1] if corners[i][1] < corners[i-1][1] else corners[i-1][1]
+                to_y = (corners[i][1] if corners[i][1] > corners[i-1][1] else corners[i-1][1]) + 1
+                for x in range(from_x, to_x):
+                    for y in range(from_y, to_y):
+                        rocks.add((x, y))
+
+        return rocks, max_y
+
+
     def part1(self) -> Any:
         cave = self.get_cave()
 
@@ -65,18 +86,18 @@ class Day(AOCDay):
         return cave.count(TType.SAND)
 
     def part2(self) -> Any:
-        cave = self.get_cave()
+        rocks, max_y = self.get_cave_rocks_and_height()
         v = set()
         q = deque()
-        q.append(SAND_SOURCE)
+        q.append((SAND_SOURCE.x, SAND_SOURCE.y))
         while q:
             current = q.pop()
-            if current in v or current.y > cave.maxY + 1:
+            if current in v or current[1] > max_y + 1:
                 continue
             v.add(current)
-            for c in [Coordinate(current.x, current.y + 1), Coordinate(current.x - 1, current.y + 1), Coordinate(current.x + 1, current.y + 1)]:
-                if cave.get(c) == TType.AIR:
-                    q.append(c)
+            for dx in [-1, 0, 1]:
+                if (current[0] + dx, current[1] + 1) not in rocks:
+                    q.append((current[0] + dx, current[1] + 1))
 
         return len(v)