public int[][] KClosest(int[][] points, int K)
{
int[] distanceArray = new int[points.Length];
for (var x = 0; x < points.Length; x++)
{
distanceArray[x] = EuclideanDistanceFromOrigin(points[x][0], points[x][1]);
}
QuickSelectOnOwn QuickSelectOnOwn = new QuickSelectOnOwn();
var ksmallest = QuickSelectOnOwn.KthSmallest(distanceArray, 0, points.Length - 1, K - 1);
int[][] answer = new int[K][];
var kcount = K;
for (var x = 0; x < points.Length; x++)
{
var distance = EuclideanDistanceFromOrigin(points[x][0], points[x][1]);
if (distance <= ksmallest)
{
answer[kcount - 1] = new int [] { points[x][0], points[x][1] };
kcount--;
}
}
return(answer);
}
public void KthSmallest()
{
int[] arr = { 12, 11, 13, 13, 13, 7 };
int n = arr.Length;
int k = 2;
QuickSelectOnOwn qs = new QuickSelectOnOwn();
var answer = qs.KthSmallest(arr, 0, n - 1, k - 1);
}