Eroare de compilare: main.cpp: In function 'int main()': main.cpp:30:8: error: no match for 'operator>' (operand types are 'std::ifstream {aka std::basic_ifstream<char>}' and 'int') fin>opt; ~~~^~~~ main.cpp:30:8: note: candidate: operator>(int, int) <built-in> main.cpp:30:8: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'int' In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:3: /usr/include/c++/6/bits/regex.h:995:5: 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:995:5: note: template argument deduction/substitution failed: main.cpp:30:9: note: 'std::ifstream {aka std::basic_ifstream<char>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>' fin>opt; ^~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:3: /usr/include/c++/6/bits/regex.h:1056:5: 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:1056:5: note: template argument deduction/substitution failed: main.cpp:30:9: note: 'std::ifstream {aka std::basic_ifstream<char>}' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' fin>opt; ^~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:3: /usr/include/c++/6/bits/regex.h:1136:5: 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:1136:5: note: template argument deduction/substitution failed: main.cpp:30:9: note: 'std::ifstream {aka std::basic_ifstream<char>}' is not derived from 'const std::__cxx11::sub_match<_BiIter>' fin>opt; ^~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:3: /usr/include/c++/6/bits/regex.h:1210:5: 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:1210:5: note: template argument deduction/substitution failed: main.cpp:30:9: note: mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int' fin>opt; ^~~ In file included from /usr/include/c++/6/regex:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:110, from main.cpp:3: /usr/include/c++/6/bits/regex.h:1284:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator>(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*) Non zero exit status: 1