Fix intentional use of negative indexing

Signed-off-by: Olivier Gayot <olivier.gayot@sigexec.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/cameltris.py b/cameltris.py
index b0c78e1..60f8aee 100755
--- a/cameltris.py
+++ b/cameltris.py
@@ -109,6 +109,9 @@ def has_collision(y: int, x: int) -> bool:
                 if element is None:
                     continue
 
+                if row_id + y < 0:
+                    continue
+
                 if col_id + x < 0:
                     return True