answer.code: In function ‘void dfs(int)’:
answer.code:8:9: error: reference to ‘visit’ is ambiguous
    8 |         visit[u]=1;
      |         ^~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:133,
                 from answer.code:1:
/usr/include/c++/11/variant:1740:5: note: candidates are: ‘template<class _Visitor, class ... _Variants> constexpr decltype(auto) std::visit(_Visitor&&, _Variants&& ...)’
 1740 |     visit(_Visitor&& __visitor, _Variants&&... __variants)
      |     ^~~~~
answer.code:5:27: note:                 ‘int visit [300010]’
    5 | int c[300010],len[300010],visit[300010],ans[300010],ansh;
      |                           ^~~~~
answer.code:11:21: error: reference to ‘visit’ is ambiguous
   11 |                 if(!visit[v])dfs(v);
      |                     ^~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:133,
                 from answer.code:1:
/usr/include/c++/11/variant:1740:5: note: candidates are: ‘template<class _Visitor, class ... _Variants> constexpr decltype(auto) std::visit(_Visitor&&, _Variants&& ...)’
 1740 |     visit(_Visitor&& __visitor, _Variants&&... __variants)
      |     ^~~~~
answer.code:5:27: note:                 ‘int visit [300010]’
    5 | int c[300010],len[300010],visit[300010],ans[300010],ansh;
      |                           ^~~~~
answer.code: In function ‘int main()’:
answer.code:28:70: error: reference to ‘visit’ is ambiguous
   28 |                 for(int i=1;i<=n;i++)cin>>c[i],g[i].clear(),len[i]=0,visit[i]=0;
      |                                                                      ^~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:133,
                 from answer.code:1:
/usr/include/c++/11/variant:1740:5: note: candidates are: ‘template<class _Visitor, class ... _Variants> constexpr decltype(auto) std::visit(_Visitor&&, _Variants&& ...)’
 1740 |     visit(_Visitor&& __visitor, _Variants&&... __variants)
      |     ^~~~~
answer.code:5:27: note:                 ‘int visit [300010]’
    5 | int c[300010],len[300010],visit[300010],ans[300010],ansh;
      |                           ^~~~~
answer.code:37:29: error: reference to ‘visit’ is ambiguous
   37 |                         if(!visit[i])dfs(i);
      |                             ^~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:133,
                 from answer.code:1:
/usr/include/c++/11/variant:1740:5: note: candidates are: ‘template<class _Visitor, class ... _Variants> constexpr decltype(auto) std::visit(_Visitor&&, _Variants&& ...)’
 1740 |     visit(_Visitor&& __visitor, _Variants&&... __variants)
      |     ^~~~~
answer.code:5:27: note:                 ‘int visit [300010]’
    5 | int c[300010],len[300010],visit[300010],ans[300010],ansh;
      |                           ^~~~~