answer.code:9:7: error: expected nested-name-specifier before ‘ll’
    9 | using ll=long long;
      |       ^~
answer.code: In function ‘void xm::_()’:
answer.code:64:23: warning: range-based ‘for’ loops only available with ‘-std=c++11’ or ‘-std=gnu++11’ [-Wc++11-extensions]
   64 |             for(int u:qv[i]) ans[u]-=dep[L[u]]-dep[fd(L[u])]-1;
      |                       ^~
answer.code:64:27: error: forming reference to reference type ‘std::vector<int>&’
   64 |             for(int u:qv[i]) ans[u]-=dep[L[u]]-dep[fd(L[u])]-1;
      |                           ^