/in/foo.cc: In function 'll lca1(ll, ll)':
/in/foo.cc:21:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(ll i=19;i>=0;i--)
  ^~~
/in/foo.cc:24:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return dp1[x][0];
   ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:54:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(ll i=0;i<q[e.id].v.size();i++)
              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:69:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(ll i=0;i<q[e.id].v.size();i++)
              ~^~~~~~~~~~~~~~~~~