Eroare de compilare: user.cpp: In function ‘void cer2()’: user.cpp:121:14: error: no match for ‘operator<<’ (operand types are ‘std::basic_ostream<char>’ and ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’) out << '\n' << v[-1]; ^ In file included from /usr/include/c++/5/iostream:39:0, from user.cpp:5: /usr/include/c++/5/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++/5/ostream:108:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, 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++/5/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++/5/ostream:117:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, 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++/5/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++/5/ostream:127:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘std::ios_base& (*)(std::ios_base&)’ /usr/include/c++/5/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++/5/ostream:166:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘long int’ /usr/include/c++/5/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++/5/ostream:170:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘long unsigned int’ /usr/include/c++/5/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++/5/ostream:174:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘bool’ In file included from /usr/include/c++/5/ostream:638:0, from /usr/include/c++/5/iostream:39, from user.cpp:5: /usr/include/c++/5/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++/5/bits/ostream.tcc:91:5: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘short int’ In file included from /usr/include/c++/5/iostream:39:0, from user.cpp:5: /usr/include/c++/5/ostream:181:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>] operator<<(unsigned short __n) ^ /usr/include/c++/5/ostream:181:7: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘short unsigned int’ In file included from /usr/include/c++/5/ostream:638:0, from /usr/include/c++/5/iostream:39, from user.cpp:5: /usr/include/c++/5/bits/ostream.tcc:105:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits<char>] basic_ostream<_CharT, _Traits>:: ^ /usr/include/c++/5/bits/ostream.tcc:105:5: note: no known conversion for argument 1 from ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, std::pair<int, int> > > >::value_type {aka std::pair<int, std::pair<int, int> >}’ to ‘int’