/in/foo.cc: In function 'void Dijkstra(int, int)':
/in/foo.cc:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < e[u].size(); i++){
                        ~~^~~~~~~~~~~~~
/in/foo.cc:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < path.size(); i++){
                    ~~^~~~~~~~~~~~~
/in/foo.cc:37:23: warning: variable 'd' set but not used [-Wunused-but-set-variable]
     Node t; int u, v, d, d2;
                       ^