Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:52:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[nod].size();i++) ^ user.cpp:60:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[1].size();i++) ^