public static CartesianTreeNode BuildCartesian(int[] inputArray)
{
var root = new CartesianTreeNode(null, 0, inputArray[0]);
var current = root;
for (int i = 1; i < inputArray.Length; i++)
{
var val = inputArray[i];
while (current.value > val && current != null)
{
current = current.Up;
}
var node = new CartesianTreeNode(current, i, val);
if (current != null)
{
node.Left = current.Right;
if (node.Left != null)
{
node.Left.Up = node;
}
current.Right = node;
}
else
{
node.Left = root;
root.Up = node;
root = node;
}
current = node;
}
root.UpdateDepth(0);
return(root);
}
public CartesianTreeNode(CartesianTreeNode up, int index, int value)
{
Up = up;
this.index = index;
this.value = value;
}
