Compilare: user.cpp: In function 'bool getElement(std::stack<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::deque<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >)': user.cpp:92: warning: control reaches end of non-void function