Compilare: user.cpp: In function ‘void printgraph()’: user.cpp:124:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<G[i].size(); j++) ^ user.cpp: In function ‘void dijkstra(int)’: user.cpp:141:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<G[current].size(); i++) ^