Compilare: user.cpp: In member function ‘bool cmpx::operator()(const Point&, const Point&) const’: user.cpp:15:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] || real(a) == real(b) && imag(a) < imag(b); ^ user.cpp: In member function ‘bool cmpy::operator()(const Point&, const Point&) const’: user.cpp:22:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] || imag(a) == imag(b) && real(a) < real(b); ^ user.cpp: In function ‘int main()’: user.cpp:32:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in", "r", stdin); ^ user.cpp:33:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out", "w", stdout); ^