Floating point comparison, CMP, tabulation ideas

Floating point comparison

Core part code

cosnt double eps=1e-8;
const double pi=acos(-1.0);
#define Equ(a,b) ((fabs((a)-(b)))<(eps))
#define More(a,b) (((a)-(b))>(eps))
#define Less(a,b) (((a)-(b))<(-eps))
#define MoreEqu(a,b) (((a)-(b))>(-eps))
#define LessEqu(a,b) (((a)-(b))<(eps))

Be careful ！abs And fabs

sort Functional cmp

bool cmp(node a,node b)
{
    return a.score<b.score;// Represents the order from small to large 
}

The meter

① Calculate all the results needed in the program at one time , For example, the first few values of fiboracci sequence are directly filled into the array and directly queried

② In procedure b Calculate all the results needed in one or more times , Manually write the results in the program A In the array , And so on

③ Violence is a small-scale result , Looking for a regular