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

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

Author: pre-commit-ci[bot]

graphs/basic_graphs.py

@@ -8,7 +8,6 @@ def _input(message):
 def initialize_unweighted_directed_graph(
     node_count: int, edge_count: int
 ) -> dict[int, list[int]]:
-    
     graph: dict[int, list[int]] = {}
     for i in range(node_count):
         graph[i + 1] = []
@@ -22,7 +21,6 @@ def initialize_unweighted_directed_graph(
 def initialize_unweighted_undirected_graph(
     node_count: int, edge_count: int
 ) -> dict[int, list[int]]:
-    
     graph: dict[int, list[int]] = {}
     for i in range(node_count):
         graph[i + 1] = []
@@ -37,7 +35,6 @@ def initialize_unweighted_undirected_graph(
 def initialize_weighted_undirected_graph(
     node_count: int, edge_count: int
 ) -> dict[int, list[tuple[int, int]]]:
-    
     graph: dict[int, list[tuple[int, int]]] = {}
     for i in range(node_count):
         graph[i + 1] = []