#include "common.h"
#include "Sphere.h" /* <===== replace this line if necessary */
#include "Vector.h"
#include <stdlib.h>
#include <fstream>
using namespace std;

extern vector<Sphere> particle; /* <===== replace this line if necessary */

void init_algorithm()
{
}

void step()
{
    integrate();
}

void make_forces()
{
    for(unsigned int i=0;i<particle.size()-1;i++)
        {
        for(unsigned int k=i+1;k<particle.size();k++)
            {
            if((particle[i].ptype()==0) || (particle[k].ptype()==0))
                {
                force(particle[i],particle[k],lx,ly);
                }
            }
        }
}