/in/foo.cc: In function 'void tr_dfs1(ll, ll)':
/in/foo.cc:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (ll i=0;i<tr[now].s.size();i++)
              ~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void tr_dfs2(ll)':
/in/foo.cc:39:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (ll i=0;i<tr[now].s.size();i++)
              ~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:66:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (ll i=2;i<=n;i++)
  ^~~
/in/foo.cc:69:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   printf("%lld\n%lld\n",ansn,ans[ansn]);
   ^~~~~~