private static Node MinValue(Node root){
Node n = root;
/* loop down to find the leftmost leaf */
while (n != null) {
n = n.left;
}
return n;
}
//find next largest node using parent pointer
public static Node nextLargest(Node n, Node root){
//if n.right exist, then find the min node in its right subtree
if (n.right != null)
return MinValue (n.right);
//if not, loop up to find a node which is the left child of its parent
//the parent is the next largest node
Node p = n.parent;
while (p != null && n == p.right) {
n = p;
p = p.parent;
}
return p;
}