add link to sample BFS question

lhmzhou · web-flow · commit 660fc7ca9e3e · 2022-10-14T20:47:22.000-05:00
diff --git a/graphs/graph_traversals.md b/graphs/graph_traversals.md
@@ -73,6 +73,8 @@ def breadth_first_search(graph, start):
 
 **Example interview question using BFS:**
 
+* [Clone an undirected graph](https://www.geeksforgeeks.org/clone-an-undirected-graph/) 
+
 
 **Runtime**: O(V + E)
 
