#include <stdio.h>
#include <stdlib.h>
#include <math.h>
??????? struct {
double x;
double y;
} ???????;
void InputVector(Vector *v)
{scanf("%lf", ???????);
scanf("%lf", ???????);
｝double LengthVector(Vector v)
{return sqrt(???????);}
int main(int argc, char **argv)
{
int i;
int num;
Vector *varray;
if(argc !=2){
return 1;
}
num = atoi(???????);
if(num < 0){
return 1;
}
varray = (???????)malloc(???????);