Eroare de compilare: main.cpp: In function 'void back(int)': main.cpp:18:13: error: no match for 'operator<' (operand types are 'std::ofstream' {aka 'std::basic_ofstream<char>'} and 'const char [2]') 18 | fout<"\n"; | ~~~~^~~~~ | | | | | const char [2] | std::ofstream {aka std::basic_ofstream<char>} In file included from /usr/include/c++/12.2.1/string:47, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/fstream:38, from main.cpp:1: /usr/include/c++/12.2.1/bits/stl_iterator.h:579:5: note: candidate: 'template<class _IteratorL, class _IteratorR> requires three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&)' (reversed) 579 | operator<=>(const reverse_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:579:5: note: template argument deduction/substitution failed: main.cpp:18:14: note: mismatched types 'const std::reverse_iterator<_IteratorL>' and 'const char [2]' 18 | fout<"\n"; | ^~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:1668:5: note: candidate: 'template<class _IteratorL, class _IteratorR> requires three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)' (reversed) 1668 | operator<=>(const move_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:1668:5: note: template argument deduction/substitution failed: main.cpp:18:14: note: mismatched types 'const std::move_iterator<_IteratorL>' and 'const char [2]' 18 | fout<"\n"; | ^~~~ In file included from /usr/include/c++/12.2.1/bits/basic_string.h:47, from /usr/include/c++/12.2.1/string:53: /usr/include/c++/12.2.1/string_view:561:5: note: candidate: 'template<class _CharT, class _Traits> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)' (reversed) 561 | operator<=>(basic_string_view<_CharT, _Traits> __x, | ^~~~~~~~ /usr/include/c++/12.2.1/string_view:561:5: note: template argument deduction/substitution failed: main.cpp:18:14: note: mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'const char*' 18 | fout<"\n"; | ^~~~ /usr/include/c++/12.2.1/bits/basic_string.h:3627:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)' (reversed) 3627 | operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/basic_string.h:3627:5: note: template argument deduction/substitution failed: main.cpp:18:14: note: mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'const char [2]' 18 | fout<"\n"; | ^~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:597:5: note: candidate: 'template<class _Iterator> requires three_way_comparable<_Iterator, std::partial_ordering> constexpr std::compare_three_way_result_t<_Iterator, _Iterator> std::operator<=>(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&)' (rewritten) 597 | operator<=>(const reverse_iterator<_Iterator>& __x, | ^~~~~~~~ /usr/include/c++/12.2.1/bits/stl_iterator.h:597:5: note: template argument deduction/substitution failed: main.cpp:18:14: note: 'std::ofstream' {aka 'std::basic_ofstream<char>'} is not derived from 'const std::reverse_iterator<_IteratorL>' 18 | fout<"\n"; Non zero exit status: 1