Language: C++

#include<iostream>
#include<string>

int main(void)
{
  int n = 0;
  std::cin >> n;
  if(0 != n % 2)
  {
    std::cout << "No";
    return;
  }
  
  std::string str;
  std::cin >> str;
  std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: return-statement with no value, in function returning 'int' [-fpermissive]
   11 |     return;
      |     ^~~~~~
a.cc:16:37: error: no match for 'operator==' (operand types are 'std::basic_ostream<char>' and 'std::__cxx11::basic_string<char>')
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~
      |             |                                    |
      |             std::basic_ostream<char>             std::__cxx11::basic_string<char>
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/c++allocator.h:33,
                 from /usr/include/c++/14/bits/allocator.h:46,
                 from /usr/include/c++/14/string:43,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/new_allocator.h:215:9: note: candidate: 'template<class _Up> bool std::operator==(const __new_allocator<char>&, const __new_allocator<_Tp>&)'
  215 |         operator==(const __new_allocator&, const __new_allocator<_Up>&)
      |         ^~~~~~~~
/usr/include/c++/14/bits/new_allocator.h:215:9: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::__new_allocator<_Tp>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::fpos<_StateT>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::allocator<_CharT>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/basic_string.h:3755:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:16:56: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   16 |   std::cout << str.substr(0, n / 2) == str.substr(n / 2) ? "Yes" : "No";
      |                                                        ^
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note: