using System;

  public static int[] Bai175(int[] arr)

        {

            int[] kq = new int[2];

​

            int min = Math.Abs(arr[0] - arr[1]);

            for (int i = 0; i < arr.Length; i++)

            {

                for (int j = i + 1; j < arr.Length; j++)

                {

                    if (Math.Abs(arr[i] - arr[j]) < min)

                    {

                        min = Math.Abs(arr[i] - arr[j]);

                        kq = new int[] { arr[i], arr[j] };

                    }

                }

            }

            return kq;

        }