Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:23: error: no match for ‘operator!=’ in ‘std::operator>> [with _CharT = char, _Traits = std::char_traits<char>](((std::basic_istream<char, std::char_traits<char> >&)(& f.std::basic_ifstream<char, std::char_traits<char> >::<anonymous>)), ((char&)(& c))) != -0x00000000000000001’ user.cpp: In function ‘void solve()’: user.cpp:44: warning: array subscript has type ‘char’ user.cpp:45: warning: array subscript has type ‘char’ user.cpp:46: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp:49: warning: array subscript has type ‘char’