Compilare: user.cpp: In function ‘void printv(std::vector<int>)’: user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:54:7: warning: unused variable ‘neg_it’ [-Wunused-variable] int neg_it = 0; ^ user.cpp:55:7: warning: unused variable ‘pos_it’ [-Wunused-variable] int pos_it = 0; ^