Language: C++

#include<bits/stdc++.h>
using namespace sdt;
int main()
{
  int N,i=0,bob_score=0,alice_score=0;
  cin >> N;
  vector<int> a(N);
  sort(a.begin(),a.end());
  reverse(a.begin(),a.end());
  if(N%2==0){
    for(i=0; i<N/2; i+=2){
      alice_score+=a.at(i);
      bob_score+=a.at(i+1);
    }
  }
  else{
    for(i=0; i<N/2; i+=2){
      alice_score+=a.at(i);
      bob_score+=a.at(i+1);
    }
    alice_score+=a.at[N-1];
  }
  cout << alice_score-bob_score << endl;
}

Compiler output:
a.cc:2:17: error: 'sdt' is not a namespace-name
    2 | using namespace sdt;
      |                 ^~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> N;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:3: error: 'vector' was not declared in this scope
    7 |   vector<int> a(N);
      |   ^~~~~~
a.cc:7:3: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:7:10: error: expected primary-expression before 'int'
    7 |   vector<int> a(N);
      |          ^~~
a.cc:8:8: error: 'a' was not declared in this scope
    8 |   sort(a.begin(),a.end());
      |        ^
a.cc:8:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
    8 |   sort(a.begin(),a.end());
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:9:3: error: 'reverse' was not declared in this scope; did you mean 'std::reverse'?
    9 |   reverse(a.begin(),a.end());
      |   ^~~~~~~
      |   std::reverse
/usr/include/c++/14/pstl/glue_algorithm_defs.h:249:1: note: 'std::reverse' declared here
  249 | reverse(_ExecutionPolicy&& __exec, _BidirectionalIterator __first, _BidirectionalIterator __last);
      | ^~~~~~~
a.cc:23:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   23 |   cout << alice_score-bob_score << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:23:36: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   23 |   cout << alice_score-bob_score << endl;
      |                                    ^~~~
      |                                    std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~