Language: C++

#include "iostream"
using namespace std;

int main()
{
    int n,k;
    cin >>n>>k;
    int a[n];
    for (int i=0; i<n; ++i){
        cin>>a[i];
    }
    int x = sizeof(a)/sizeof(a[0]);
    sort(a, a+x);
    int s = accumulate (begin(a), k(a)),0,plus<int>;
    cout<<s;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |     sort(a, a+x);
      |     ^~~~
      |     short
a.cc:14:30: error: no matching function for call to 'begin(int [n])'
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
In file included from /usr/include/c++/14/bits/range_access.h:36,
                 from /usr/include/c++/14/string:53,
                 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/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   mismatched types 'std::initializer_list<_Tp>' and 'int*'
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   variable-sized array type 'int [n]' is not a valid template argument
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   variable-sized array type 'int [n]' is not a valid template argument
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   variable-sized array type 'long int' is not a valid template argument
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
/usr/include/c++/14/bits/range_access.h:113:31: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
  113 |   template<typename _Tp> _Tp* begin(valarray<_Tp>&) noexcept;
      |                               ^~~~~
/usr/include/c++/14/bits/range_access.h:113:31: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   mismatched types 'std::valarray<_Tp>' and 'int [n]'
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
/usr/include/c++/14/bits/range_access.h:114:37: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
  114 |   template<typename _Tp> const _Tp* begin(const valarray<_Tp>&) noexcept;
      |                                     ^~~~~
/usr/include/c++/14/bits/range_access.h:114:37: note:   template argument deduction/substitution failed:
a.cc:14:30: note:   mismatched types 'const std::valarray<_Tp>' and 'int [n]'
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                         ~~~~~^~~
a.cc:14:36: error: 'k' cannot be used as a function
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |                                   ~^~~
a.cc:14:13: error: 'accumulate' was not declared in this scope
   14 |     int s = accumulate (begin(a), k(a)),0,plus<int>;
      |             ^~~~~~~~~~