Language: C++

#include<iostream>
#include<bits/stdc++.h>
using namespace std;

int main()
{
  int n,k,i,sum;
  vector<int>a;
  float maxi;
  
  cin>>n>>k;
  
  a.resize(n);
  for(i=0;i<n;++i)
  cin>>a[i];
  
  maxi=-1.0;
  for(i=0;i<k;++i)
  sum+=a[i];

  maxi=max(maxi,(sum+k)/2);
  for(i=k;i<n;++i)
  {
    sum-=a[i-k];
    sum+=a[i];
    maxi=max(maxi,(sum+k)/2.0);    
  } 
  
  cout<<fixed<<setprecision(12)<<maxi;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:11: error: no matching function for call to 'max(float&, int)'
   21 |   maxi=max(maxi,(sum+k)/2);
      |        ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:21:11: note:   deduced conflicting types for parameter 'const _Tp' ('float' and 'int')
   21 |   maxi=max(maxi,(sum+k)/2);
      |        ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:21:11: note:   mismatched types 'std::initializer_list<_Tp>' and 'float'
   21 |   maxi=max(maxi,(sum+k)/2);
      |        ~~~^~~~~~~~~~~~~~~~
a.cc:26:13: error: no matching function for call to 'max(float&, double)'
   26 |     maxi=max(maxi,(sum+k)/2.0);
      |          ~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:26:13: note:   deduced conflicting types for parameter 'const _Tp' ('float' and 'double')
   26 |     maxi=max(maxi,(sum+k)/2.0);
      |          ~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:26:13: note:   mismatched types 'std::initializer_list<_Tp>' and 'float'
   26 |     maxi=max(maxi,(sum+k)/2.0);
      |          ~~~^~~~~~~~~~~~~~~~~~