/in/foo.cc: In function 'void Trajan(int)':
/in/foo.cc:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<G[x].size();i++)
          ~^~~~~~~~~~~~
/in/foo.cc: In function 'void Sech(int)':
/in/foo.cc:44:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<Gp[x].size();i++)
          ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:70:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(j=0;j<G[i].size();j++)
           ~^~~~~~~~~~~~