/in/foo.cc: In member function 'int BinTree::count(Node*)':
/in/foo.cc:95:6: warning: unused variable 'left' [-Wunused-variable]
  int left = count(node->left);
      ^~~~
/in/foo.cc: In constructor 'BinTree::BinTree()':
/in/foo.cc:102:7: warning: statement has no effect [-Wunused-value]
  root == NULL;
       ^