C# JAVA 删除重复数据，双重for循环 可能效率说的底，但是简单

            int[] ptr = { 3,2, 3,3, 6,6, 777, 8 };

            //List<int> list = ptr.ToList();

            for (int i = ptr.Length-1 ; i > 0; i--)
            {
                for (int j = 0; j < i; j++)
                {
                    if (ptr[i] ==  ptr[j])
                    {

                        List<int> list = ptr.ToList();
                        list.RemoveAt(i);
                        ptr = list.ToArray();

                    }
                }
            }