answer.code: In function ‘int main()’:
answer.code:122:20: error: ‘begin’ was not declared in this scope
  122 |         for(auto v:sz){
      |                    ^~
answer.code:122:20: note: suggested alternatives:
In file included from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:166,
                 from answer.code:1:
/usr/include/c++/13/valarray:1232:5: note:   ‘std::begin’
 1232 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
In file included from /usr/include/c++/13/bits/ranges_algobase.h:38,
                 from /usr/include/c++/13/bits/ranges_algo.h:38,
                 from /usr/include/c++/13/algorithm:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51:
/usr/include/c++/13/bits/ranges_base.h:489:44: note:   ‘std::ranges::__cust::begin’
  489 |     inline constexpr __cust_access::_Begin begin{};
      |                                            ^~~~~
In file included from /usr/include/c++/13/filesystem:50,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:200:
/usr/include/c++/13/bits/fs_dir.h:607:3: note:   ‘std::filesystem::__cxx11::begin’
  607 |   begin(recursive_directory_iterator __iter) noexcept
      |   ^~~~~
In file included from /usr/include/c++/13/bits/stl_iterator_base_types.h:71,
                 from /usr/include/c++/13/bits/stl_algobase.h:65,
                 from /usr/include/c++/13/algorithm:60:
/usr/include/c++/13/bits/iterator_concepts.h:969:10: note:   ‘std::ranges::__cust_access::begin’
  969 |     void begin(const auto&) = delete;
      |          ^~~~~
answer.code:122:20: error: ‘end’ was not declared in this scope
  122 |         for(auto v:sz){
      |                    ^~
answer.code:122:20: note: suggested alternatives:
/usr/include/c++/13/valarray:1259:5: note:   ‘std::end’
 1259 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/13/bits/ranges_base.h:490:42: note:   ‘std::ranges::__cust::end’
  490 |     inline constexpr __cust_access::_End end{};
      |                                          ^~~
/usr/include/c++/13/bits/fs_dir.h:612:3: note:   ‘std::filesystem::__cxx11::end’
  612 |   end(recursive_directory_iterator) noexcept
      |   ^~~
/usr/include/c++/13/bits/ranges_base.h:137:10: note:   ‘std::ranges::__cust_access::end’
  137 |     void end(const auto&) = delete;
      |          ^~~