Compilare: user.cpp: In function ‘void bf1()’: user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[u.nod].size();i++) ^ user.cpp: In function ‘void bfn(int)’: user.cpp:61:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[u.nod].size();i++) ^