Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:94:32: error: no match for ‘operator<’ (operand types are ‘std::basic_ostream<char>’ and ‘const char [2]’) fout<<caut2(nr)<"\n"; ~~~~~~~~~~~~~~~^~~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:110, from user.cpp:1: /usr/include/c++/6/bits/regex.h:962:5: note: candidate: template<class _BiIter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&) operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) ^~~~~~~~ /usr/include/c++/6/bits/regex.h:962:5: note: template argument deduction/substitution failed: user.cpp:94:33: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ fout<<caut2(nr)<"\n"; ^~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:110, from user.cpp:1: /usr/include/c++/6/bits/regex.h:1041:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&) operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1041:5: note: template argument deduction/substitution failed: user.cpp:94:33: note: ‘std::basic_ostream<char>’ is not derived from ‘std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>’ fout<<caut2(nr)<"\n"; ^~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:110, from user.cpp:1: /usr/include/c++/6/bits/regex.h:1121:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&) operator<(const sub_match<_Bi_iter>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1121:5: note: template argument deduction/substitution failed: user.cpp:94:33: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ fout<<caut2(nr)<"\n"; ^~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:110, from user.cpp:1: /usr/include/c++/6/bits/regex.h:1198:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&) operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs, ^~~~~~~~ /usr/include/c++/6/bits/regex.h:1198:5: note: template argument deduction/substitution failed: user.cpp:94:33: note: mismatched types ‘const std::__cxx11::sub_match<_BiIter>’ and ‘const char [2]’ fout<<caut2(nr)<"\n"; ^~~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/32/bits/stdc++.h:110, from user.cpp:1: /usr/include/c++/6/bits/regex.h:1272:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*) operator<(const sub_match<_Bi_iter>& __lhs, ^~~~~~~~