multiset

#include<iostream>
#include<set>
#include<string>
#include<algorithm>
using namespace std;
struct point
{
  int x;
  int y;
  point(int x,int y)
  :x(x),y(y){}
  int dist() const
  {
      return x*x+y*y;
  }
};
struct cmp
{
    bool operator()(const point &x , const point &y)const
    {
        return x.dist() < y.dist();
    }
};
ostream& operator<< (ostream &os, const point &pnt) {
        return os<<pnt.x<<' '<<pnt.y<<endl;
}
int main()
{
  multiset<point,cmp> a;
  while(1)
  {
    string command;
    int x,y,r;
    cin>>command;
    if(command=="remove")
    {
      x=a.size();
      cin>>r;
      a.erase(point(0,r));
      cout<<x-a.size()<<" points were removed"<<endl;
    }
    if(command=="print")
    {
      cin>>r;
      for(auto it=a.equal_range(point(0,r)).first;it!=a.equal_range(point(0,r)).second;++it)
      {
        cout<<*it;
      }
    }
    if(command=="add")
    {
      cin>>x>>y;
      a.insert(point(x,y));
    }
  }
  return 0;
}