Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:22:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[head].size(); j++) ^ user.cpp:13:7: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:13:9: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^