Language: C++

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

int main() {
  cin >> n;
  vector<int> vec(n);
  for (int i = 0; i < n; i++) {
    cin >> vec.at(i);
  }
  vec = sort(vec.begin(), vec.end());
  int a,b = 0;
  for (int i = 0; i < n; i++) {
    if (i%2 == 0) {
      a += vec.(i);
    } else {
      b += vec.(i);
    }
  }
  cout << abs(a-b) << endl;
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespacec'
    2 | using namespacec std;
      |       ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   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:5:10: error: 'n' was not declared in this scope; did you mean 'yn'?
    5 |   cin >> n;
      |          ^
      |          yn
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<int> vec(n);
      |   ^~~~~~
a.cc:6:3: 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:6:10: error: expected primary-expression before 'int'
    6 |   vector<int> vec(n);
      |          ^~~
a.cc:8:12: error: 'vec' was not declared in this scope
    8 |     cin >> vec.at(i);
      |            ^~~
a.cc:10:3: error: 'vec' was not declared in this scope
   10 |   vec = sort(vec.begin(), vec.end());
      |   ^~~
a.cc:10:9: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   10 |   vec = sort(vec.begin(), vec.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:14:16: error: expected unqualified-id before '(' token
   14 |       a += vec.(i);
      |                ^
a.cc:16:16: error: expected unqualified-id before '(' token
   16 |       b += vec.(i);
      |                ^
a.cc:19:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |   cout << abs(a-b) << 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:19:23: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   19 |   cout << abs(a-b) << 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)
      |     ^~~~