Update graph-valid-tree.py

kamyu104 · kamyu104 · commit 1ca05fe2a3d6 · 2015-10-03T14:41:07.000+08:00
diff --git a/Python/graph-valid-tree.py b/Python/graph-valid-tree.py
@@ -18,7 +18,7 @@ def validTree(self, n, edges):
             nodes[edge[0]][neighbors].append(edge[1])
             nodes[edge[1]][neighbors].append(edge[0])
 
-        # BFS to check whether the graph is valid tree.
+        # BFS to check whether the graph is a valid tree.
         visited = {}
         q = collections.deque()
         q.append(0)
