answer.code: In function ‘int count_and(const BitSet&, const BitSet&)’:
answer.code:63:24: error: no matching function for call to ‘popcount(__int128 unsigned)’
   63 |         cnt += popcount(b1.values[i] & b2.values[i]);
      |                ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/13/bits/stl_algobase.h:76,
                 from /usr/include/c++/13/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51,
                 from answer.code:1:
/usr/include/c++/13/bit:426:5: note: candidate: ‘template<class _Tp> constexpr std::_If_is_unsigned_integer<_Tp, int> std::popcount(_Tp)’
  426 |     popcount(_Tp __x) noexcept
      |     ^~~~~~~~
/usr/include/c++/13/bit:426:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/13/bits/stl_pair.h:60,
                 from /usr/include/c++/13/bits/stl_algobase.h:64:
/usr/include/c++/13/type_traits: In substitution of ‘template<bool _Cond, class _Tp> using std::enable_if_t = typename std::enable_if::type [with bool _Cond = false; _Tp = int]’:
/usr/include/c++/13/bit:379:11:   required by substitution of ‘template<class _Tp, class _Up> using std::_If_is_unsigned_integer = std::enable_if_t<std::__is_one_of<typename std::remove_cv< <template-parameter-1-1> >::type, unsigned char, short unsigned int, unsigned int, long unsigned int, long long unsigned int>::value, _Up> [with _Tp = __int128 unsigned; _Up = int]’
/usr/include/c++/13/bit:426:5:   required by substitution of ‘template<class _Tp> constexpr std::_If_is_unsigned_integer<_Tp, int> std::popcount(_Tp) [with _Tp = __int128 unsigned]’
answer.code:63:24:   required from here
/usr/include/c++/13/type_traits:2610:11: error: no type named ‘type’ in ‘struct std::enable_if<false, int>’
 2610 |     using enable_if_t = typename enable_if<_Cond, _Tp>::type;
      |           ^~~~~~~~~~~