输入整型数组和N，返回数组每N个平均后新数组

 

        private ArrayList GetAvg(int[] arr, int n)
        {
            ArrayList arrAvg = new ArrayList();

            for (int i = 0; i < arr.Length; i += n)
            {
                int x = 0;
                for (int j = 0; j < n; j++)
                {
                    if (i + j == arr.Length - 1 && j < n - 1)
                    {
                        n = j + 1;
                    }
                    x += arr[i + j];
                }
                x /= n;
                arrAvg.Add(x);
            }

            return arrAvg;
        }