/in/foo.cc: In function 'int main()':
/in/foo.cc:38:10: warning: unused variable 'end' [-Wunused-variable]
    Node *end=node;
          ^~~
/in/foo.cc:22:10: warning: 'p' is used uninitialized in this function [-Wuninitialized]
  cin>>p->value;
          ^~~~~
/in/foo.cc:28:16: warning: 'node' is used uninitialized in this function [-Wuninitialized]
     cin>>node->value;
                ^~~~~