/in/foo.cc: In function 'void print()':
/in/foo.cc:7:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=1;i<=n.size();i++)
               ~^~~~~~~~~~
/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:17:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(dep==n.size()+1)
     ~~~^~~~~~~~~~~~
/in/foo.cc:22:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n.size();i++)
              ~^~~~~~~~~~
/in/foo.cc:28:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(dep==n.size())
       ~~~^~~~~~~~~~