Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:23:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A.size();++i) ^ user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A.size();++i) ^