/in/foo.cc: In function 'void Dijkstra(int)':
/in/foo.cc:31:17: 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 Dijkstrar(int)':
/in/foo.cc:52:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int k=0;k<gr[i].size();k++){
                ~^~~~~~~~~~~~~