/in/foo.cc: In function 'void dfssss(int)':
/in/foo.cc:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g2[x].size();i++)
              ~^~~~~~~~~~~~~
/in/foo.cc: In function 'void dfsss(int)':
/in/foo.cc:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[x].size();i++)
              ~^~~~~~~~~~~~