Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[a.y].size(); i++) ^ user.cpp:66:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[h].size();j++) ^