Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:38:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[current].size(); i++){ // iterate the neighs of the current node ^ user.cpp:36:7: warning: unused variable ‘current_val’ [-Wunused-variable] int current_val= s.begin() -> value ; // current node's value ^