sedcftyv的博客

double x1[100010],y1[100010],x2[100010],y2[100010]; inline double cross(int a,int b) { double x=x2[a]-x1[a],y=y2[a]-y1[a]; return ((x2[b]-x1[a])*y-x*(y2[b]-y1[a]))*((x1[b]-x1[a])*y-x*(y1[b]-y...

double x1,Y1,x2,y2,x3,y3,x4,y4; bool line() { double x=x2-x1,y=y2-Y1; //cout<<x<<' '<<y<<endl; // cout<<(x3-x1)<<' '<<(y3-Y1)<<endl; if(...

double x1,Y1,x2,y2,x3,y3; struct vec { double a,b,c; vec(double x,double y,double z):a(x),b(y),c(z){}; }; vec pro(double x1,double Y1,double x2,double y2) { return (vec){x2-x1,y2-Y1,-((x2...

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