Compilare: user.cpp: In function ‘void df(int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘void sterge(int, int)’: user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:79:17: warning: variable ‘ultim’ set but not used [-Wunused-but-set-variable] int prim=-1,ultim; ^