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

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

Author: pre-commit-ci[bot]

graphs/push_relabel.py

@@ -81,9 +81,7 @@ def max_flow(self, source: int, sink: int) -> int:
                 self.excess[source] -= cap
 
         # Process vertices with excess
-        active = [
-            v for v in range(n) if v not in (source, sink) and self.excess[v] > 0
-        ]
+        active = [v for v in range(n) if v not in (source, sink) and self.excess[v] > 0]
 
         while active:
             u = active.pop()