#include
#include
#include
#pragma warning(disable: 4996)
struct POINTF{
float x;
float y;
};
float len(POINTF* a, POINTF* b){
return sqrt(pow(b->x - a->x,2) + pow(b->y - a->y,2));
}
void main() {
struct POINTF point[10];
float result;
int i = 10;
while (i-- != 0) {
scanf("%f%f", point[i].x, point[i].y);
}
}