Language: C++

#include<bits/stdc++.h>

int main() {
  vector<int> l, r{0};
  int N, K;
  for (int i = 0; i < N; i++) {
    int x; cin >> x;
    if (x >= 0) r.push_back(x);
    else l.push_back(-x);
  }
  l.push_back(0);
  reverse(l.begin(), l.end());
  int res = 2e9;
  for (int i = 0; i < min<int>(K+1, l.size()); i++) {
    int j = K - i;
    if (j >= r.size()) continue;
    int L = l[i], R = r[j];
    res = min(res, L + R + min(L, R));
  }
  cout << res << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'vector' was not declared in this scope
    4 |   vector<int> l, r{0};
      |   ^~~~~~
a.cc:4:3: 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,
                 from a.cc:1:
/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:4:10: error: expected primary-expression before 'int'
    4 |   vector<int> l, r{0};
      |          ^~~
a.cc:7:12: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |     int x; cin >> x;
      |            ^~~
      |            std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:17: error: 'r' was not declared in this scope
    8 |     if (x >= 0) r.push_back(x);
      |                 ^
a.cc:9:10: error: 'l' was not declared in this scope
    9 |     else l.push_back(-x);
      |          ^
a.cc:11:3: error: 'l' was not declared in this scope
   11 |   l.push_back(0);
      |   ^
a.cc:12:3: error: 'reverse' was not declared in this scope; did you mean 'std::reverse'?
   12 |   reverse(l.begin(), l.end());
      |   ^~~~~~~
      |   std::reverse
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:249:1: note: 'std::reverse' declared here
  249 | reverse(_ExecutionPolicy&& __exec, _BidirectionalIterator __first, _BidirectionalIterator __last);
      | ^~~~~~~
a.cc:14:23: error: 'min' was not declared in this scope; did you mean 'std::min'?
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                       ^~~
      |                       std::min
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: 'std::min' declared here
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
a.cc:14:27: error: expected primary-expression before 'int'
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                           ^~~
a.cc:14:27: error: expected ';' before 'int'
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                           ^~~
      |                           ;
a.cc:14:27: error: expected primary-expression before 'int'
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                           ^~~
a.cc:14:27: error: expected ')' before 'int'
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |       ~                   ^~~
      |                           )
a.cc:14:30: error: expected unqualified-id before '>' token
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                              ^
a.cc:14:48: error: 'i' was not declared in this scope
   14 |   for (int i = 0; i < min<int>(K+1, l.size()); i++) {
      |                                                ^
a.cc:20:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   20 |   cout << res << 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:20:18: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   20 |   cout << res << 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)
      |     ^~~~