import java.util.*;
import java.io.*;

class Point {
    private double x;
    private double y;

    public Point(double x, double y){
        setX(x);
        setY(y);
    }

    public void setX(double x){
        this.x = x;
    }

    public void setY(double y){
        this.y = y;
    }

    public double getX(){
        return this.x;
    }

    public double getY(){
        return this.y;
    }

    public double getDistance(){
        return Math.sqrt(x*x + y*y);
    }

    public String toString(){
        return "" + this.x + " " + this.y;
    }
}


class PointList {
    private ArrayList<Point> pList = new ArrayList<>();

    public PointList(File file) throws FileNotFoundException {
        Scanner sc = new Scanner(file);
        while(sc.hasNextLine()){
            double x = Double.parseDouble(sc.nextLine());
            double y = Double.parseDouble(sc.nextLine());
            Point point = new Point(x, y);
            pList.add(point);
        }
        sc.close();
    }

    public void print(){
        for(int i = 0; i < pList.size(); ++i){
            Point p = pList.get(i);
            double d = p.getDistance();
            System.out.println(p + " d=" + d);
        }
        System.out.println();
    }
    public void sort(){
        Collections.sort(pList, new Comparator<Point>(){
                public int compare(Point p1, Point p2){
                    return Double.compare(p1.getDistance(), p2.getDistance());
                }
            }
        );
    }
    public void sort(Comparator<Point> cmp){
        Collections.sort(pList, cmp);
    }
}

class MyComparator implements Comparator<Point> {
    public int compare(Point p1, Point p2){
        int xCmp = Double.compare(p1.getX(), p2.getX());
        int yCmp = Double.compare(p1.getY(), p2.getY());
        return (xCmp != 0) ? xCmp : yCmp;
    }
}

public class Sandbox {

    public static void main(String[] args) {
        try {

            PointList pList = new PointList(new File("points.txt"));

            pList.sort();
            pList.print();

            Comparator<Point> cmpX = new Comparator<Point>(){
                public int compare(Point p1, Point p2){
                    return Double.compare(p1.getX(), p2.getX());
                }
            };
            pList.sort(cmpX);
            pList.print();


            pList.sort(new Comparator<Point>(){
                    public int compare(Point p1, Point p2){
                        return Double.compare(p1.getY(), p2.getY());
                    }
                }
            );
            pList.print();

            pList.sort(new MyComparator());
            pList.print();

        } catch(Exception e){
            e.printStackTrace();
            System.out.println("Unexpected error, sorry!");
        }
    }
}