View Compilation Error

0_0_3835098_27773.cpp: In member function `void BSTTree<T>::_show(BSTNode<T>*, int&)':
0_0_3835098_27773.cpp:273: error: `ans' undeclared (first use this function)
0_0_3835098_27773.cpp:273: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3835098_27773.cpp:273: error: `cnt' undeclared (first use this function)