Compilare: user.cpp: In function ‘void bf()’: user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:39:22: warning: unused variable ‘j’ [-Wunused-variable] int prim,ultim,i,j,x,y; ^ user.cpp:39:26: warning: unused variable ‘y’ [-Wunused-variable] int prim,ultim,i,j,x,y; ^