Compilare: user.cpp: In function ‘std::vector<std::complex<_Tp> > intersect_poly_halfplane(const std::vector<std::complex<_Tp> >&, const std::complex<_Tp>&, const std::complex<_Tp>&)’: user.cpp:444:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (N == 1) if (! clockwise(A,B,V[0]) ) return V; else return res; ^ user.cpp: In function ‘int same_side(const point&, const point&, const polygon&, int&)’: user.cpp:153:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:685:3: note: in expansion of macro ‘re’ re (i, size(ch)) { ^ user.cpp: In function ‘bool try_candidates(int, int, const polygon&, const polygon&, std::pair<std::complex<long long int>, std::complex<long long int> >&)’: user.cpp:775:9: warning: unused variable ‘index_1b’ [-Wunused-variable] int index_1b = (index_1 + n_p1 + 1) % n_p1; ^ user.cpp:778:9: warning: unused variable ‘index_2b’ [-Wunused-variable] int index_2b = (index_2 + n_p2 + 1) % n_p2; ^ user.cpp: In function ‘bool try_closest(int, int, const polygon&, const polygon&, std::pair<std::complex<long long int>, std::complex<long long int> >&)’: user.cpp:801:10: warning: unused variable ‘res1’ [-Wunused-variable] double res1 = 1e20, res2 = 1e20; ^ user.cpp:801:23: warning: unused variable ‘res2’ [-Wunused-variable] double res1 = 1e20, res2 = 1e20; ^