Compilare: user.cpp: In function ‘void bfs()’: user.cpp:14:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int w=0; w<V[q].size(); w++){ ^ user.cpp: In function ‘void check(int)’: user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<V[q].size(); i++){ ^ user.cpp:30:31: warning: ‘next’ may be used uninitialized in this function [-Wmaybe-uninitialized]