diff --git a/ex11/ex11.cpp b/ex11/ex11.cpp
index 34c95ff..9e07857 100644
--- a/ex11/ex11.cpp
+++ b/ex11/ex11.cpp
@@ -26,6 +26,8 @@ int main()
         case 2:
             printf("分别输入起始节点序号 到达节点序号 边权重:");
             std::cin >> id1 >> id2 >> w;
+            if(id1==id2)
+                printf("失败\n");
             switch (gv.link(id1, id2, w))
             {
             case 0:
diff --git a/ex11/graph.hpp b/ex11/graph.hpp
index 51e4571..6066c9d 100644
--- a/ex11/graph.hpp
+++ b/ex11/graph.hpp
@@ -4,6 +4,7 @@
 #include <iomanip>
 #include <iostream>
 #include <string>
+#include "../ex10/queue.hpp"
 
 
 template <class Te>
@@ -187,6 +188,27 @@ public:
                 printf("\n");
             }
     }
+
+    virtual void BFS(int id)
+    {
+        Queue<int> q;
+
+        q.enqueue(id);
+        while (!q.empty())
+        {
+           int vid = q.dequeue();
+
+           for (int j = 0; j < 100;j++)
+           {
+               if(E[id][j]!=NULL)
+                   q.enqueue(j);
+           }
+
+           // std::cout << node->pos;
+           printf("ID: %d",q.dequeue());
+
+        }
+    }
 };
 
 #endif
\ No newline at end of file