numberer的博客

#include using namespace std; struct Cos{ long long x,y; bool operator < (Cos A) { double x1,x2,y1,y2; x1=x; x2=A.x; y1=y; y2=A.y; return

#include using namespace std; #define sqr(x) ((x)*(x)) const int maxn = 50005; const double EPS = 1e-10; double add(double a, double b) { if (abs(a + b)<EPS*(abs(a) + abs(b))) return 0; retur