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#include <bits/stdc++.h>
using namespace std;
 
int main() {
	// your code goes here
	vector<int> v = {1,2,3,4,5,6,7,8};
	cout << *((v.begin()+v.end())/2);
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:7:22: error: no match for ‘operator+’ (operand types are ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ and ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’)
  cout << *((v.begin()+v.end())/2);
             ~~~~~~~~~^~~~~~~~
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:829:7: note: candidate: __gnu_cxx::__normal_iterator<_Iterator, _Container> __gnu_cxx::__normal_iterator<_Iterator, _Container>::operator+(__gnu_cxx::__normal_iterator<_Iterator, _Container>::difference_type) const [with _Iterator = int*; _Container = std::vector<int>; __gnu_cxx::__normal_iterator<_Iterator, _Container>::difference_type = long int]
       operator+(difference_type __n) const _GLIBCXX_NOEXCEPT
       ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:829:7: note:   no known conversion for argument 1 from ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ to ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type {aka long int}’
/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:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.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:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::move_iterator<_IteratorL>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:4944:5: 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:4944:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.tcc:1147:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.tcc:1147:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   mismatched types ‘const _CharT*’ and ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.tcc:1163:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.tcc:1163:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:4981:5: 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 _CharT*)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:4981:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:4997:5: 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>&, _CharT)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:4997:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5009:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5009:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5015:5: 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>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5015:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5021:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5021:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5033:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5033:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   mismatched types ‘const _CharT*’ and ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5039:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)
     operator+(_CharT __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5039:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5045:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _CharT*)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5045:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5051:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, _CharT)
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5051:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:326:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator+(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:326:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:335:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const _Tp&)
     operator+(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:335:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:344:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const _Tp&, const std::complex<_Tp>&)
     operator+(const _Tp& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:344:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:445:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&)
     operator+(const complex<_Tp>& __x)
     ^~~~~~~~
/usr/include/c++/6/complex:445:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:68,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_deque.h:372:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> std::_Deque_iterator<_Tp, _Ref, _Ptr> std::operator+(std::ptrdiff_t, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator+(ptrdiff_t __n, const _Deque_iterator<_Tp, _Ref, _Ptr>& __x)
     ^~~~~~~~
/usr/include/c++/6/bits/stl_deque.h:372:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Deque_iterator<_Tp, _Ref, _Ptr>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/vector:65:0,
                 from /usr/include/c++/6/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_bvector.h:297:3: note: candidate: std::_Bit_iterator std::operator+(std::ptrdiff_t, const std::_Bit_iterator&)
   operator+(ptrdiff_t __n, const _Bit_iterator& __x)
   ^~~~~~~~
/usr/include/c++/6/bits/stl_bvector.h:297:3: note:   no known conversion for argument 1 from ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ to ‘std::ptrdiff_t {aka long int}’
/usr/include/c++/6/bits/stl_bvector.h:387:3: note: candidate: std::_Bit_const_iterator std::operator+(std::ptrdiff_t, const std::_Bit_const_iterator&)
   operator+(ptrdiff_t __n, const _Bit_const_iterator& __x)
   ^~~~~~~~
/usr/include/c++/6/bits/stl_bvector.h:387:3: note:   no known conversion for argument 1 from ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ to ‘std::ptrdiff_t {aka long int}’
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:402:5: note: candidate: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^
/usr/include/c++/6/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:402:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^
/usr/include/c++/6/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:402:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^
/usr/include/c++/6/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:402:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^
/usr/include/c++/6/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:402:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^
/usr/include/c++/6/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1167:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^
/usr/include/c++/6/valarray:1167:1: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1167:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^
/usr/include/c++/6/valarray:1167:1: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1167:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^
/usr/include/c++/6/valarray:1167:1: note:   template argument deduction/substitution failed:
prog.cpp:7:29: note:   ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << *((v.begin()+v.end())/2);
                             ^
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/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:966:5: note: candidate: __gnu_cxx::__normal_iterator<_Iterator, _Container> __gnu_cxx::operator+(typename __gnu_cxx::__normal_iterator<_Iterator, _Container>::difference_type, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&) [with _Iterator = int*; _Container = std::vector<int>; typename __gnu_cxx::__normal_iterator<_Iterator, _Container>::difference_type = long int]
     operator+(typename __normal_iterator<_Iterator, _Container>::difference_type
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:966:5: note:   no known conversion for argument 1 from ‘std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}’ to ‘__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type {aka long int}’

Standard output is empty