Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 
int main() {
  ll A;
  cin>>A;
  string B;
  cin>>B;
  ll C=stoll(B[0])*100+stoll(B[2])*10+stoll(b[3]);
  cout<<A*B/100<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: no matching function for call to 'stoll(__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type&)'
   11 |   ll C=stoll(B[0])*100+stoll(B[2])*10+stoll(b[3]);
      |        ~~~~~^~~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:4180:3: note: candidate: 'long long int std::__cxx11::stoll(const std::string&, std::size_t*, int)'
 4180 |   stoll(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~~
/usr/include/c++/14/bits/basic_string.h:4180:23: note:   no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4180 |   stoll(const string& __str, size_t* __idx = 0, int __base = 10)
      |         ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4447:3: note: candidate: 'long long int std::__cxx11::stoll(const std::wstring&, std::size_t*, int)'
 4447 |   stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~~
/usr/include/c++/14/bits/basic_string.h:4447:24: note:   no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4447 |   stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |         ~~~~~~~~~~~~~~~^~~~~
a.cc:11:29: error: no matching function for call to 'stoll(__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type&)'
   11 |   ll C=stoll(B[0])*100+stoll(B[2])*10+stoll(b[3]);
      |                        ~~~~~^~~~~~
/usr/include/c++/14/bits/basic_string.h:4180:3: note: candidate: 'long long int std::__cxx11::stoll(const std::string&, std::size_t*, int)'
 4180 |   stoll(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~~
/usr/include/c++/14/bits/basic_string.h:4180:23: note:   no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4180 |   stoll(const string& __str, size_t* __idx = 0, int __base = 10)
      |         ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4447:3: note: candidate: 'long long int std::__cxx11::stoll(const std::wstring&, std::size_t*, int)'
 4447 |   stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~~
/usr/include/c++/14/bits/basic_string.h:4447:24: note:   no known conversion for argument 1 from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4447 |   stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |         ~~~~~~~~~~~~~~~^~~~~
a.cc:11:45: error: 'b' was not declared in this scope
   11 |   ll C=stoll(B[0])*100+stoll(B[2])*10+stoll(b[3]);
      |                                             ^
a.cc:12:10: error: no match for 'operator*' (operand types are 'll' {aka 'long long int'} and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   12 |   cout<<A*B/100<<endl;
      |         ~^~
      |         | |
      |         | std::string {aka std::__cxx11::basic_string<char>}
      |         ll {aka long long int}
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::complex<_Tp>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::complex<_Tp>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::complex<_Tp>'
   12 |   cout<<A*B/100<<endl;
      |           ^
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/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++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/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++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/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++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/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++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/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++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/valarray:1198:1: 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>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:12:11: note:   mismatched types 'const std::valarray<_Tp>' and 'll' {aka 'long long int'}
   12 |   cout<<A*B/100<<endl;
      |           ^
/usr/include/c++/14/valarray:1198:1: 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&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: not