public Node(double value, ACTION action)
{
left = right = null;
key = value;
number = 0;
this.action = action;
}
public Node()
{
left = right = null;
key = -1;
number = 0;
action = ACTION.NONE;
}
public Node(double value)
{
left = right = null;
key = value;
number = 0;
action = ACTION.NONE;
}
public Node(Node left, Node right)
{
this.left = left;
this.right = right;
key = left.key + right.key;
number = 0;
action = ACTION.NONE;
}
public Node(double key, ACTION action, double number, Node left, Node right)
{
this.left = left;
this.right = right;
this.key = key;
this.number = number;
this.action = action;
}
public static void Copy(Node from, ref Node to)
{
to = from;
}
private void push(ref Node node, int left, int right)
{
if (node != null)
push(ref node, left, right, ACTION.NONE, 0);
}
private void push(ref Node node, int left, int right, ACTION action, double value)
{
int center = (left + right) / 2;
if (node.left != null)
push(ref node.left, left, center, node.action, node.number);
if (node.right != null)
push(ref node.right, center + 1, right, node.action, node.number);
if (node.action == ACTION.LIST)
node.key = do_action(node.key, action, value);
else
{
double left_value = 0, right_value = 0;
if (node.left.action == ACTION.UPDATE)
left_value = (center - left + 1) * node.left.number;
else if (node.left.action == ACTION.ADD)
left_value = node.left.key + (center - left + 1) * node.left.number;
else
left_value = node.left.key;
if (node.right.action == ACTION.UPDATE)
right_value = (center - left + 1) * node.right.number;
else if (node.right.action == ACTION.ADD)
right_value = node.right.key + (center - left + 1) * node.right.number;
else
right_value = node.right.key;
node.key = left_value + right_value;
node.action = action;
node.number = value;
}
}
private void mass_update(ref Node node, int left, int right, int query_left, int query_right, ACTION action, double value)
{
if (query_left > query_right)
return;
if (left == query_left && right == query_right)
{
if (left == right)
node.key = do_action(node.key, action, value);
else if (action == ACTION.UPDATE)
{
clear(ref node);
node.action = action;
node.number = value;
}
else
{
push(ref node, left, right);
node.action = action;
node.number += value;
}
}
else
{
if (node.action == ACTION.ADD || node.action == ACTION.UPDATE)
push(ref node, left, right);
int center = (left + right) / 2;
mass_update(ref node.left, left, center, query_left, Math.Min(query_right, center), action, value);
mass_update(ref node.right, center + 1, right, Math.Max(query_left, center + 1), query_right, action, value);
double left_value = 0, right_value = 0;
if (node.left.action == ACTION.UPDATE)
left_value = (center - left + 1) * node.left.number;
else if (node.left.action == ACTION.ADD)
left_value = node.left.key + (center - left + 1) * node.left.number;
else
left_value = node.left.key;
if (node.right.action == ACTION.UPDATE)
right_value = (center - left + 1) * node.right.number;
else if (node.right.action == ACTION.ADD)
right_value = node.right.key + (center - left + 1) * node.right.number;
else
right_value = node.right.key;
node.key = left_value + right_value;
}
}
private void pointed_update(ref Node node, int left, int right, int position, ACTION action, double value)
{
if (left == right)
node.key = do_action(node.key, action, value);
else
{
int center = (left + right) / 2;
if (node.action == ACTION.UPDATE)
push(ref node, left, right);
if (position <= center)
pointed_update(ref node.left, left, center, position, action, value);
else
pointed_update(ref node.right, center + 1, right, position, action, value);
node.key = node.left.key + node.right.key;
}
}
private double get(Node node, int left, int right, int query_left, int query_right)
{
if (query_left > query_right)
return 0;
if (left == query_left && right == query_right)
{
if (node.action == ACTION.UPDATE || node.action == ACTION.ADD)
push(ref node, left, right);
return node.key;
}
int center = (left + right) / 2;
if (node.action == ACTION.NONE)
return get(node.left, left, center, query_left, Math.Min(query_right, center))
+ get(node.right, center + 1, right, Math.Max(query_left, center + 1), query_right);
else if (node.action == ACTION.ADD || node.action == ACTION.UPDATE)
{
push(ref node, left, right);
return get(node.left, left, center, query_left, Math.Min(query_right, center))
+ get(node.right, center + 1, right, Math.Max(query_left, center + 1), query_right);
}
else
return node.key;
}
private Node Copy(Node node)
{
if (node == null)
return null;
else
return new Node(node.key, node.action, node.number, Copy(node.left), Copy(node.right));
}
private void clear(ref Node node)
{
if (node.left != null)
clear(ref node.left);
if (node.right != null)
clear(ref node.right);
if (node.action != ACTION.NONE && node.action != ACTION.LIST)
{
node.action = ACTION.NONE;
node.number = 0;
}
}
public ST()
{
root = new Node();
length = 0;
}
// Constructor
public ST(params object[] list)
{
// Reading an Array
List<double> temp = new List<double>();
int len = list.Length;
for (int i = 0; i < len; i++)
{
try
{
double arg0 = Convert.ToDouble(list[i]);
temp.Add(arg0);
}
catch
{
double[] arg1 = list[i] as double[];
if (arg1 != null)
temp.AddRange(arg1);
}
}
// Preparing an Segment Tree
Node node = build(temp, 0, temp.Count - 1);
root = new Node();
length = temp.Count;
Node.Copy(node, ref root);
}