/in/foo.cc: In function 'int main()':
/in/foo.cc:34:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0;i<edge[now].size();i++)
                ~^~~~~~~~~~~~~~~~~
/in/foo.cc:44:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i=1;i<=n;i++)
  ^~~
/in/foo.cc:45:23: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   printf("%d ",id[i]);printf("\n");
                       ^~~~~~