Compilare: user.cpp: In function ‘int BFS()’: user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[nod].size();j++) ^ user.cpp: In function ‘int Drum()’: user.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[nod].size();j++) ^ user.cpp:53:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[n].size();i++) ^