const double eps = 1e-8;
#define Equ(a, b) (fabs((a) - (b)) < (eps)) // a == b
#define More(a, b) ((a) - (b) > (eps)) // a > b
#define MoreEqu(a, b) ((a) - (b) > (-eps)) // a >= b
#define Less(a, b) ((a) - (b) < (-eps)) // a < b
#define LessEqu(a, b) ((a) - (b) < (eps)) // a <= b