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

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

Author: pre-commit-ci[bot]

matrix/transitive_closure.py

@@ -3,6 +3,7 @@
 https://en.wikipedia.org/wiki/Floyd%E2%80%93Warshall_algorithm
 """
 
+
 def transitive_closure(graph: list[list[int]]) -> list[list[int]]:
     """
     Compute the transitive closure of a directed graph using the