Eroare de compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:17: error: ‘x’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:27: error: no match for ‘operator>’ in ‘f.std::basic_ifstream<char, std::char_traits<char> >::<anonymous>.std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>](((int&)(& x))) > y’