Argthtjtr

I have the following problem: given a list of point coordinate return the k closest point to the origin, the return type should be a list of coordinate.
I have worked on this code but need to fix the return type smallestkpoints to match the return type of closestPoints method.
any thoughts?

import java.lang.Math;

import java.util.List;

import java.util.Arrays;

import java.util.Hashtable;

import java.lang.Integer;

import java.lang.Double;



public class ClosestKPoints {



    //distance to origin

    public static Double distance(Integer x, Integer y) {



        double powX = Math.pow(x, 2);

        double powY = Math.pow(y, 2);



        return (Double)(Math.sqrt(powX + powY));

    }





    public static List<List<Integer>> closestPoints(int k, List<List<Integer>> points, int all) {



        Hashtable<Double,List<Integer>> pt = new Hashtable();

        Double  dt = new Double[all];//where we store distances later to be sorted

        List<List<Integer>> smallestKPoints;//to be used as return result





        for (int i = 0; i <points.size(); i++) {

            List<Integer> in = points.get(i);

            for (int j = 0; j < in.size() - 1; j++) {

                Integer x = in.get(j);

                Integer y = in.get(j + 1);

                pt.put(distance( x, y), points.get(i));

                dt[i] = distance(x, y);

            } 



        }



        Arrays.sort(dt);



        for (int n = 0; n < k; n++) {

            List<Integer> smallestKPoints = pt.get(dt[n]);

        }



        return smallestKPoints;



    }

}