answer.code: In function ‘void dfs1(int, int)’:
answer.code:24:22: error: ‘G’ was not declared in this scope
   24 |         if(u != par) G[u].erase(find(G[u].begin(), G[u].end(), par));
      |                      ^
answer.code:25:14: error: ‘G’ was not declared in this scope
   25 |         sort(G[u].begin(), G[u].end());
      |              ^
answer.code:26:9: error: ‘dep’ was not declared in this scope
   26 |         dep[u] = dep[fa[u] = par] + 1, sz[u] = 1;
      |         ^~~
answer.code: In function ‘void dfs2(int, int)’:
answer.code:46:22: error: ‘G’ was not declared in this scope
   46 |         for(auto v : G[u]) if(v != son[u]) dfs2(v, v);
      |                      ^
answer.code: In function ‘int chain_f(int, int)’:
answer.code:49:12: error: ‘dep’ was not declared in this scope
   49 |         if(dep[u] - dep[v] <= 1) return 1;
      |            ^~~
answer.code: In lambda function:
answer.code:51:33: error: no match for ‘operator/’ (operand types are ‘Mint’ and ‘std::vector<Mint>’)
   51 |                 return (preg[r] / pref[l - 1]).get();
      |                         ~~~~~~~ ^ ~~~~~~~~~~~
      |                               |             |
      |                               Mint          std::vector<Mint>
In file included from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/complex:422:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator/(const std::complex<_Tp>&, const std::complex<_Tp>&)’
  422 |     operator/(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/complex:422:5: note:   template argument deduction/substitution failed:
answer.code:51:45: note:   ‘Mint’ is not derived from ‘const std::complex<_Tp>’
   51 |                 return (preg[r] / pref[l - 1]).get();
      |                                             ^
In file included from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/complex:431:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator/(const std::complex<_Tp>&, const _Tp&)’
  431 |     operator/(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/11/complex:431:5: note:   template argument deduction/substitution failed:
answer.code:51:45: note:   ‘Mint’ is not derived from ‘const std::complex<_Tp>’
   51 |                 return (preg[r] / pref[l - 1]).get();
      |                                             ^
In file included from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/complex:440:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator/(const _Tp&, const std::complex<_Tp>&)’
  440 |     operator/(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/complex:440:5: note:   template argument deduction/substitution failed:
answer.code:51:45: note:   ‘std::vector<Mint>’ is not derived from ‘const std::complex<_Tp>’
   51 |                 return (preg[r] / pref[l - 1]).get();
      |                                             ^
In file included from /usr/include/c++/11/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:95,
                 from answer.code:1:
/usr/include/c++/11/bits/valarray_after.h:408:5: note: candidate: ‘template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__divides, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__divides, typename _Dom1::value_type>::result_type> std::operator/(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)’
  408 |     _DEFINE_EXPR_BINARY_OPERATOR(/, struct std::__divides)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/11/bits/valarray_after.h:408:5: note:   template argument deduction/substitution failed:
answer.code:51:45: note:   ‘Mint’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
   51 |                 return (preg[r] / pref[l - 1]).get();
      |                                             ^
In file included from /usr/include/c++/11/valarray:603,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:95,
                 from answer.code:1:
/usr/include/c++/11/bits/valarray_after.h:408:5: note: candidate: ‘template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__divides, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__divides, typename _Dom1::value_type>::result_type> std::operator/(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)’
  408 |     _DEFINE_EXPR_BINARY_OPERATOR(/, struct std::__divides)
      |     ^~~~~~~~~~~~~~~~~...