day 18 python fix a flood fill bug

not sure how this ever worked
2022-12-17 22:35:10 -08:00 · 2022-12-17 22:35:10 -08:00 · 772dda0bbc
parent 4b5b25e56b
commit 772dda0bbc
1 changed files with 4 additions and 5 deletions
--- a/day18/sol.py
+++ b/day18/sol.py
@ -53,11 +53,10 @@ def flood(lava, border):
        x |= roll(a, 1, +1)
        x |= roll(a, 2, -1)
        x |= roll(a, 2, +1)
-        x = x & ~border
-        x = x & ~lava
-        if (a == x).all():
-            a |= border
+        x &= ~lava
+        b = a | x
+        if (a == b).all():
            return a
-        a = x
+        a = b

 solve()