Language: C++

#include <bits/stdc++.h>
using namespace std;
 
main(){
  double N,K;
  cin >> N >> K;
  vector<double> max(N);
  vector<double> ave(N-K+1);
  for(int i=0;i<N;i++){
    cin >> max.at(i);
  }
  double ave = 0, ans = 0;
  for(int i=0;i<N-K+1;i++){
    for(int j=0;j<K;j++){
      ave += (1+max.at(i+j))/2;
    }
    if(ave>ans) ans = ave.at(i);
  }
 	
  cout << ans << endl;
}

Compiler output:
a.cc:4:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    4 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:12:10: error: conflicting declaration 'double ave'
   12 |   double ave = 0, ans = 0;
      |          ^~~
a.cc:8:18: note: previous declaration as 'std::vector<double> ave'
    8 |   vector<double> ave(N-K+1);
      |                  ^~~
a.cc:15:11: error: no match for 'operator+=' (operand types are 'std::vector<double>' and '__gnu_cxx::__alloc_traits<std::allocator<double>, double>::value_type' {aka 'double'})
   15 |       ave += (1+max.at(i+j))/2;
      |       ~~~~^~~~~~~~~~~~~~~~~~~~
a.cc:17:11: error: no match for 'operator>' (operand types are 'std::vector<double>' and 'double')
   17 |     if(ave>ans) ans = ave.at(i);
      |        ~~~^~~~
      |        |   |
      |        |   double
      |        std::vector<double>
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1176:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1176 |     operator>(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1176:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1236:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator>(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1236 |     operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1236:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1329:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator>(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1329 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1329:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1403:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1403 |     operator>(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1403:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'double'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1497:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1497 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1497:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1573:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1573 |     operator>(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1573:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'double'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/regex.h:1673:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1673 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1673:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1058:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator>(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1058 |     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1058:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::pair<_T1, _T2>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:462:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  462 |     operator>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:462:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::reverse_iterator<_Iterator>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/stl_iterator.h:507:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  507 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:507:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::reverse_iterator<_Iterator>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1714 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::move_iterator<_IteratorL>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1774 |     operator>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'const std::move_iterator<_IteratorL>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 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:
/usr/include/c++/14/string_view:695:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  695 |     operator> (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:695:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/string_view:702:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  702 |     operator> (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:702:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   'std::vector<double>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/string_view:710:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  710 |     operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:710:5: note:   template argument deduction/substitution failed:
a.cc:17:12: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'double'
   17 |     if(ave>ans) ans = ave.at(i);
      |            ^~~
/usr/include/c++/14/bits/basic_string.h:3915:5: 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>&)'
 3915 |     operator>(const basic_string<_CharT, _Traits