/in/foo.cc: In function 'void DIJ(int)':
/in/foo.cc:16:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int k=0;k<g[i].size();k++){
               ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int x=0;x<p[i].size();x++){
                 ~^~~~~~~~~~~~
/in/foo.cc:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
        for(int y=0;y<p[j].size();y++){
                    ~^~~~~~~~~~~~