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:442:6: 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 ‘double distance_point_polygon(const point&, const std::vector<std::complex<double> >&)’: 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:610:3: note: in expansion of macro ‘re’ re (i, size(ch) - 1) ^ user.cpp: In function ‘int same_side(const point&, const point&, const polygon&)’: 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:678:3: note: in expansion of macro ‘re’ re (i, size(ch)) { ^ user.cpp: In function ‘int closest_point_to_polygon(const polygon&, const polygon&)’: 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:695:3: note: in expansion of macro ‘re’ re (i, size(from)) { ^ user.cpp: In function ‘bool try_candidates(int, const polygon&, polygon, std::pair<std::complex<double>, std::complex<double> >&)’: user.cpp:710:24: warning: unused variable ‘n_p2’ [-Wunused-variable] int n_p1 = size(p1), n_p2 = size(p2); ^