Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:22:14: error: no matching function for call to ‘std::basic_ifstream<char>::open()’ fin.open(); ^ user.cpp:22:14: note: candidates are: In file included from user.cpp:1:0: /usr/include/c++/4.8/fstream:538:7: note: void std::basic_ifstream<_CharT, _Traits>::open(const char*, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::ios_base::openmode = std::_Ios_Openmode] open(const char* __s, ios_base::openmode __mode = ios_base::in) ^ /usr/include/c++/4.8/fstream:538:7: note: candidate expects 2 arguments, 0 provided /usr/include/c++/4.8/fstream:558:7: note: void std::basic_ifstream<_CharT, _Traits>::open(const string&, std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; std::string = std::basic_string<char>; std::ios_base::openmode = std::_Ios_Openmode] open(const std::string& __s, ios_base::openmode __mode = ios_base::in) ^ /usr/include/c++/4.8/fstream:558:7: note: candidate expects 2 arguments, 0 provided user.cpp:51:13: error: ‘i’ was not declared in this scope for(i = 1; i <= k; i++) ^