Borderou de evaluare (job #61894)

Eroare de compilare: user.cpp: In function ‘void solve_test(int, char*)’: user.cpp:21:25: error: no matching function for call to ‘std::basic_ifstream<char>::basic_ifstream(std::string&)’ user.cpp:21:25: note: candidates are: /usr/include/c++/4.6/fstream:460:7: note: std::basic_ifstream<_CharT, _Traits>::basic_ifstream(const char*, std::ios_base::openmode) [with _CharT = char, _Traits = std::char_traits<char>, std::ios_base::openmode = std::_Ios_Openmode] /usr/include/c++/4.6/fstream:460:7: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string<char>}’ to ‘const char*’ /usr/include/c++/4.6/fstream:446:7: note: std::basic_ifstream<_CharT, _Traits>::basic_ifstream() [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.6/fstream:446:7: note: candidate expects 0 arguments, 1 provided /usr/include/c++/4.6/fstream:420:11: note: std::basic_ifstream<char>::basic_ifstream(const std::basic_ifstream<char>&) /usr/include/c++/4.6/fstream:420:11: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string<char>}’ to ‘const std::basic_ifstream<char>&’ user.cpp:22:27: error: no matching function for call to ‘std::basic_ofstream<char>::basic_ofstream(std::string&)’ user.cpp:22:27: note: candidates are: /usr/include/c++/4.6/fstream:629:7: note: std::basic_ofstream<_CharT, _Traits>::basic_ofstream(const char*, std::ios_base::openmode) [with _CharT = char, _Traits = std::char_traits<char>, std::ios_base::openmode = std::_Ios_Openmode] /usr/include/c++/4.6/fstream:629:7: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string<char>}’ to ‘const char*’ /usr/include/c++/4.6/fstream:614:7: note: std::basic_ofstream<_CharT, _Traits>::basic_ofstream() [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.6/fstream:614:7: note: candidate expects 0 arguments, 1 provided /usr/include/c++/4.6/fstream:588:11: note: std::basic_ofstream<char>::basic_ofstream(const std::basic_ofstream<char>&) /usr/include/c++/4.6/fstream:588:11: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string<char>}’ to ‘const std::basic_ofstream<char>&’ user.cpp:33:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]