Compilare: user.cpp: In function ‘double dist_min(int, int, std::vector<punct>&, std::vector<punct>&)’: user.cpp:67:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<b.size(); ++i) ^ user.cpp:68:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < b.size() && b[j].y - b[i].y <= min_p; ++j) ^ user.cpp:46:32: warning: unused variable ‘min_p1’ [-Wunused-variable] double min_st,min_dr,min_p,min_p1; ^