static void Main()
{
Console.WriteLine("I love you");
int [] arr = { 4, 6, 1, 8, 3, 2, 9, 0, 5, 7 };
var bit = new BIT(arr);
bit.Display();
Console.WriteLine();
for (int i = 0; i < arr.Length; i++)
{
Console.Write(bit.Sum(i) + " ");
}
bit.Update(10, 7);
Console.WriteLine();
for (int i = 0; i < arr.Length; i++)
{
Console.Write(bit.Sum(i) + " ");
}
Console.Write(bit.Sum(1) - bit.Sum(0));
}