/in/foo.cc: In function 'int main()':
/in/foo.cc:11:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |         for(int i=0;i<s.size();i++)
      |                     ~^~~~~~~~~
/in/foo.cc:13:16: error: no match for 'operator*' (operand types are 'int' and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   13 |         cout<<2*ans-s.size();
      |               ~^~~~
      |               | |
      |               | std::string {aka std::__cxx11::basic_string<char>}
      |               int
In file included from /usr/include/c++/12/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:54,
                 from /in/foo.cc:1:
/usr/include/c++/12/complex:392:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  392 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/12/complex:392:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/complex:401:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  401 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/12/complex:401:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/complex:410:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  410 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/12/complex:410:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::complex<_Tp>'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
In file included from /usr/include/c++/12/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:95:
/usr/include/c++/12/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/valarray:1187:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const valarray<_Tp>&)'
 1187 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/valarray:1187:1: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/valarray:1187:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1187 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/valarray:1187:1: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   13 |         cout<<2*ans-s.size();
      |                 ^~~
/usr/include/c++/12/valarray:1187:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1187 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/12/valarray:1187:1: note:   template argument deduction/substitution failed:
/in/foo.cc:13:17: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not