Compilare: user.cpp: In function ‘void bf(int)’: user.cpp:24:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<gf[x].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:79:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<lat.size();i++) ^ user.cpp:67:22: warning: unused variable ‘j’ [-Wunused-variable] int i,t,n,ii,a,b,j,y; ^ user.cpp:67:24: warning: unused variable ‘y’ [-Wunused-variable] int i,t,n,ii,a,b,j,y; ^