Compilare: user.cpp: In function ‘int bfs()’: user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<L[nod].size(); i++) ^ user.cpp: In function ‘void bfs2()’: user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<L[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:88:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<L[d].size(); i++) ^