Solve 2021 day 20, 21, 23, 25

2021/d22.py

@@ -0,0 +1,27 @@
+from lib import get_data
+from lib import ints
+
+data = get_data(__file__)
+
+limit = 50
+ps = set()
+for i, line in enumerate(data.splitlines()):
+    x_min, x_max, y_min, y_max, z_min, z_max = ints(line)
+    for x in range(max(x_min, -limit), min(x_max, limit) + 1):
+        for y in range(max(y_min, -limit), min(y_max, limit) + 1):
+            for z in range(max(z_min, -limit), min(z_max, limit) + 1):
+                if line.startswith("on"):
+                    ps.add((x, y, z))
+                elif line.startswith("off"):
+                    if (x, y, z) in ps:
+                        ps.remove((x, y, z))
+                else:
+                    assert False
+print(len(ps))
+
+
+# For part 1, we were limited to an area of -50..50 for all three directions.
+# For part 2, this limitation is no longer in place. That means we cannot keep
+# track of all the points individually. Instead, it will be necessary. To keep
+# track of regions. Ultimately, we then have to perform arithmetic on the
+# regions. This is not trivial enough for me right now.