/** x y / \ / \ A y => x C / \ / \ B C A B */
private void leftRotate(Node<T> x) {
Node<T> parent = x.parent;
Node<T> y = x.right;
Node<T> B = y.left;
y.left = x;
x.parent = y;
x.right = B;
if (B != null) B.parent = x;
y.parent = parent;
if (parent != null) {
parent.replaceChild(x, y);
} else {
root = y;
}
updateHeight(x);
}
private void addToRight(Node<T> parent, Node<T> newNode) {
countNodes++;
parent.right = newNode;
newNode.parent = parent;
}