/in/foo.cc: In function 'int main()':
/in/foo.cc:103:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<scc[aa].size();j++)
               ~^~~~~~~~~~~~~~~
/in/foo.cc:108:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=1;k<=scc[aa].size();k++)
               ~^~~~~~~~~~~~~~~~