/in/foo.cc: In function 'void DIJ(int, int)':
/in/foo.cc:22:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
               ~^~~~~~~~~~~~
/in/foo.cc: In function 'void topo()':
/in/foo.cc:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<gg[i].size();k++){
               ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int k=0;k<g[i].size();k++){
                 ~^~~~~~~~~~~~
/in/foo.cc:86:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int k=0;k<g[i].size();k++){
                  ~^~~~~~~~~~~~