answer.code: In function ‘long long int max_weights(int, int, int*, int*, int*)’:
answer.code:16:22: error: ‘begin’ was not declared in this scope
   16 |         for (auto i: W) sum += i;
      |                      ^
answer.code:16:22: note: suggested alternatives:
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:95,
                 from answer.code:1:
/usr/include/c++/11/valarray:1224:5: note:   ‘std::begin’
 1224 |     begin(const valarray<_Tp>& __va)
      |     ^~~~~
In file included from /usr/include/c++/11/filesystem:46,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:129,
                 from answer.code:1:
/usr/include/c++/11/bits/fs_dir.h:549:3: note:   ‘std::filesystem::__cxx11::begin’
  549 |   begin(recursive_directory_iterator __iter) noexcept
      |   ^~~~~
answer.code:16:22: error: ‘end’ was not declared in this scope
   16 |         for (auto i: W) sum += i;
      |                      ^
answer.code:16:22: note: suggested alternatives:
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:95,
                 from answer.code:1:
/usr/include/c++/11/valarray:1244:5: note:   ‘std::end’
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
In file included from /usr/include/c++/11/filesystem:46,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:129,
                 from answer.code:1:
/usr/include/c++/11/bits/fs_dir.h:554:3: note:   ‘std::filesystem::__cxx11::end’
  554 |   end(recursive_directory_iterator) noexcept
      |   ^~~