foo.cc: In function 'int main()':
foo.cc:11:11: error: no match for 'operator>' (operand types are 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' and 'int')
     cin>>n>x;
     ~~~~~~^~
foo.cc:11:11: note: candidate: operator>(int, int) <built-in>
foo.cc:11:11: note:   no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' to 'int'
In file included from /usr/include/c++/7/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_pair.h:467:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator>(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:467:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::pair<_T1, _T2>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:320:5: note: candidate: template<class _Iterator> bool std::operator>(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator>(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:320:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:358:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator>(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator>(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:358:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:1169:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator>(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1169:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::move_iterator<_IteratorL>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_iterator.h:1175:5: note: candidate: template<class _Iterator> bool std::operator>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator>(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1175:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::move_iterator<_IteratorL>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/basic_string.h:6132:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool 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++/7/bits/basic_string.h:6132:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/basic_string.h:6145:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6145:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
     cin>>n>x;
            ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/basic_string.h:6157:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator>(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6157:5: note:   template argument deduction/substitution failed:
foo.cc:11:12: note:   mismatched types 'const _CharT*' and 'std::basic_istream<char>'
     cin>>n>x;
            ^
foo.cc:14:20: error: 'sum' was not declared in this scope
         while(tmp) sum+=tmp%10==x, tmp/=10;
                    ^~~

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