Fix some bug & Update README.md

Graph/Dijkatra.cpp

@@ -40,7 +40,7 @@ int main()
 
     //Get the adjacency matrix.
     cout << "Adjacency matrix:" << endl;
-    for (i = 0; i < VertexNum - 1; i++)
+    for (i = 0; i < VertexNum; i++)
     {
         for (int j = 0; j < VertexNum; j++)
         {
@@ -101,6 +101,9 @@ int main()
         cout << "To " << lasPos + 1 << " min length " << lasPathLen << endl
              << endl;
     }
+
+    system("pause");
+    return 0;
 }
 
 //Display the martix