diff --git a/ex11/ex11.cpp b/ex11/ex11.cpp
index 9ae0181..cb864bb 100644
--- a/ex11/ex11.cpp
+++ b/ex11/ex11.cpp
@@ -9,7 +9,7 @@ int main()
     std::string name;
     while (1)
     {
-        printf("选择操作:1添加节点2添加边3删除节点4删除边\n");
+        printf("选择操作:1添加/覆盖节点2添加/覆盖边3删除节点4删除边\n");
         scanf("%d", &op);
         switch (op)
         {
diff --git a/ex11/graph.hpp b/ex11/graph.hpp
index 8577c00..aeb5fbb 100644
--- a/ex11/graph.hpp
+++ b/ex11/graph.hpp
@@ -53,7 +53,7 @@ class graphVertex
 {
 private:
     Vector<Vertex<Tv> *> V;
-    Vector<Vector<Edge<Te> *>> E;
+    Vector<Edge<Te> *> E;
     int v;
     int e;
 
@@ -86,25 +86,24 @@ public:
     }
     virtual int insect(int id, Tv value)
     {
-        if (V[id] == NULL)
-        {
-            Vertex<Tv>* temp= new Vertex<Tv>(value);
-            V.put(id, temp);
-            // E[id] = new Vector<Edge<Te>>;
-        }
-        else
-            V[id]->data = value;
+        // if (V[id] == NULL)
+        // {
+        Vertex<Tv> *temp1 = new Vertex<Tv>(value);
+        V.put(id, temp1);
+        // }
+        // else
+        //     V[id]->data = value;
         v++;
         return id;
     }
-    virtual int remove(int id)
+    virtual Tv remove(int id)
     {
         for (int j = 0; j < v; j++)
         {
-            if (E[id][j] != NULL)
+            if (E[id][j]!= NULL)
             {
                 delete E[id][j];
-                E[id].put(j,NULL);
+                E[id].put(j, NULL);
                 V[j]->inDegree--;
             }
         }
@@ -112,6 +111,7 @@ public:
         Tv temp = vertex(id);
         delete V[id];
         V.put(id, NULL);
+        return temp;
     }
 
     // id1->id2 进行连接
@@ -121,14 +121,14 @@ public:
     //         0 成功
     virtual int link(int id1, int id2, int w)
     {
-        if (V[id1] == NULL || V[id2] == NULL)
-            return -1;
-        if (E[id1][id2] != NULL)
-            return -2;
+        // if (V[id1] == NULL || V[id2] == NULL)
+        //     return -1;
+        // if (E[id1][id2] != NULL)
+        //     return -2;
         V[id1]->outDegree++;
         V[id2]->inDegree++;
-        Edge<Te>* temp=new Edge<Te>(w);
-        E[id1].put(id2, temp);
+        Edge<Te> *temp = new Edge<Te>(w);
+        (E->_v[id1])->_v[id2] = temp;
         return 0;
     }
     // 解除 id1->id2 连接
diff --git a/ex11/vector.hpp b/ex11/vector.hpp
index cb138bd..181c347 100644
--- a/ex11/vector.hpp
+++ b/ex11/vector.hpp
@@ -6,7 +6,7 @@
 template <class T>
 class Vector
 {
-private:
+public:
   T *_v;
   int _len;
   int _used;
@@ -30,7 +30,7 @@ public:
   Vector()
   {
     _used = 0;
-    _len = 10;
+    _len = 100;
     _v = new T[_len];
   }
   ~Vector()
@@ -39,12 +39,10 @@ public:
   }
 
   T get(int a) { return _v[a]; }
-  T operator[](int i)
+  T  operator[](int i) const
   {
-    while (i >= _len)
-    {
-      expand();
-    }
+    if(i>=_len)
+      return 0;
     return _v[i];
   }
 
@@ -84,10 +82,10 @@ template <class T>
 void Vector<T>::put(int a, T value)
 {
 
-  while (a >= _len)
-  {
-    expand();
-  }
+  // while (a >= _len)
+  // {
+  //   expand();
+  // }
   _used++;
   _v[a] = value;
 }
@@ -110,7 +108,7 @@ void Vector<T>::expand()
 
   for (int i = old_len; i < _len; i++)
   {
-    p[i] = NULL;
+    p[i] = 0;
   }
 
   delete[] _v;