Eroare de compilare: main.cpp: In function 'int main()': main.cpp:17:14: error: no match for 'operator<<' (operand types are 'std::ofstream {aka std::basic_ofstream<char>}' and 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}') g<<(s.begin())<<"\n"; ~^~~~~~~~~~~~~ In file included from /usr/include/c++/6/istream:39:0, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/ostream:108:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(__ostream_type& (*__pf)(__ostream_type&)) ^~~~~~~~ /usr/include/c++/6/ostream:108:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&) {aka std::basic_ostream<char>& (*)(std::basic_ostream<char>&)}' /usr/include/c++/6/ostream:117:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>; std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios<char>] operator<<(__ios_type& (*__pf)(__ios_type&)) ^~~~~~~~ /usr/include/c++/6/ostream:117:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}' /usr/include/c++/6/ostream:127:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(ios_base& (*__pf) (ios_base&)) ^~~~~~~~ /usr/include/c++/6/ostream:127:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'std::ios_base& (*)(std::ios_base&)' /usr/include/c++/6/ostream:166:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(long __n) ^~~~~~~~ /usr/include/c++/6/ostream:166:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'long int' /usr/include/c++/6/ostream:170:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(unsigned long __n) ^~~~~~~~ /usr/include/c++/6/ostream:170:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'long unsigned int' /usr/include/c++/6/ostream:174:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(bool __n) ^~~~~~~~ /usr/include/c++/6/ostream:174:7: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'bool' In file included from /usr/include/c++/6/ostream:638:0, from /usr/include/c++/6/istream:39, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/ostream.tcc:91:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits<char>] basic_ostream<_CharT, _Traits>:: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/include/c++/6/bits/ostream.tcc:91:5: note: no known conversion for argument 1 from 'std::set<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' to 'short int' In file included from /usr/include/c++/6/istream:39:0, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, Non zero exit status: 1