Eroare de compilare: main.cpp: In function 'int main()': main.cpp:23:18: error: no match for 'operator+' (operand types are 'int' and 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}') in >> (1 + sir); ~~^~~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/bits/stl_iterator.h:341:5: note: candidate: template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&) operator+(typename reverse_iterator<_Iterator>::difference_type __n, ^~~~~~~~ /usr/include/c++/6/bits/stl_iterator.h:341:5: note: template argument deduction/substitution failed: main.cpp:23:20: note: 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' is not derived from 'const std::reverse_iterator<_Iterator>' in >> (1 + sir); ^~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/bits/stl_iterator.h:1200:5: note: candidate: template<class _Iterator> std::move_iterator<_IteratorL> std::operator+(typename std::move_iterator<_IteratorL>::difference_type, const std::move_iterator<_IteratorL>&) operator+(typename move_iterator<_Iterator>::difference_type __n, ^~~~~~~~ /usr/include/c++/6/bits/stl_iterator.h:1200:5: note: template argument deduction/substitution failed: main.cpp:23:20: note: 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' is not derived from 'const std::move_iterator<_IteratorL>' in >> (1 + sir); ^~~ In file included from /usr/include/c++/6/string:52:0, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/bits/basic_string.h:4947:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/basic_string.h:4947:5: note: template argument deduction/substitution failed: main.cpp:23:20: note: mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' and 'int' in >> (1 + sir); ^~~ In file included from /usr/include/c++/6/string:53:0, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, Non zero exit status: 1