[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

divide_and_conquer/inversions.py

@@ -118,7 +118,7 @@ def _count_cross_inversions(p: list[int], q: list[int]) -> tuple[list[int], int]
     return r, num_inversion
 
 
-def main()-> None:
+def main() -> None:
     arr_1 = [10, 2, 1, 5, 5, 2, 11]
 
     # this arr has 8 inversions: