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:609:3: note: in expansion of macro ‘re’ re (i, size(ch) - 1) ^ user.cpp: In function ‘int same_side(const point&, const point&, const polygon&, 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:681:3: 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<double>, std::complex<double> >&)’: user.cpp:773:9: warning: unused variable ‘index_1b’ [-Wunused-variable] int index_1b = (index_1 + n_p1 + 1) % n_p1; ^ user.cpp:776:9: 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<double>, 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:803:3: note: in expansion of macro ‘re’ re (i, size(p2)) { ^ 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:811:3: note: in expansion of macro ‘re’ re (i, size(p1)) { ^