#include
using namespace std;
struct poi{
double x,y;
void set(double a,double b){
x=a;y=b;
}
void outp(){
printf("%.2lf %.2lf \n",x,y);
}
};
double dis(poi a,poi b){
return((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
}
int main(){
}
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