import { CompareFn } from 'src';
import { AVLTreeNode } from './avlTreeNode';
import { Edge } from './binaryTreeUtils';
import { SortedTree } from './sortedTree';
import { LinkedNode } from 'src/list';
/**
 * An AVL tree is a self-balancing binary search tree ([source](https://en.wikipedia.org/wiki/AVL_tree)).
 *
 * It is named after inventors Georgy Adelson-Velsky and Evgenii Landis and was the first such
 * data structure to be invented. In an AVL tree, the heights of the two child
 * subtrees of any node differ by at most one; if at any time they differ by more
 * than one, rebalancing is done to restore this property.
 *
 * Lookup, insertion, and deletion all take O(log(n)) time in both the average and worst cases,
 * where n is the number of nodes in the tree prior to the operation. Insertions and deletions
 * may require the tree to be rebalanced by one or more tree rotations.
 *
 * AVL trees are often compared with red–black trees as both take O(log(n))
 * time for the basic operations. For lookup-intensive applications, AVL trees are
 * faster than red–black trees because they are more strictly balanced.
 * Similar to red–black trees, AVL trees are height-balanced.
 */
export declare class AVLTree<T> implements SortedTree<T> {
    /**
     * The function to determine the order of elements.
     */
    protected compare: CompareFn<T>;
    /**
     * Indicates how to handle duplicates:
     * - < 0 : Add to left subtree
     * - = 0 : Do now allow duplicates
     * - > 0 : Add to right subtree
     */
    protected dupeWeight: number;
    /**
     * The number of elements in the list.
     */
    protected length: number;
    /**
     * The root of the tree.
     */
    protected root: AVLTreeNode<T>;
    /**
     * Instantiate a tree.
     *
     * @param compareFn - The function to determine the order of elements.
     * @param elements - A set of elements to initialize the tree with.
     */
    constructor(compareFn: CompareFn<T>, elements?: Iterable<T>);
    /**
     * Instantiate a tree.
     *
     * @param compareFn - The function to determine the order of elements.
     * @param allowDuplicates - Whether to allow duplicates
     * @param elements - A set of elements to initialize the tree with.
     */
    constructor(compareFn: CompareFn<T>, allowDuplicates: boolean, elements?: Iterable<T>);
    add(element: T): this;
    clear(): void;
    comparator(): CompareFn<T>;
    delete(element: T): boolean;
    has(element: T): boolean;
    max(): T | undefined;
    min(): T | undefined;
    pop(): T | undefined;
    shift(): T | undefined;
    get size(): number;
    sorted(): Iterable<T>;
    /**
     * Receive an iterator through the list.
     *
     * **Note:** Unexpected behavior can occur if the collection is modified during iteration.
     *
     * @returns An iterator through the list
     */
    [Symbol.iterator](): Iterator<T>;
    update(curElement: T, newElement: T): boolean;
    protected build(obj: Iterable<T>): void;
}
/**
 * @internal
 */
export declare function balance<T>(node: AVLTreeNode<T>): AVLTreeNode<T>;
/**
 * @internal
 */
export declare function remove<T>(stack: LinkedNode<Edge<AVLTreeNode<T>>>): boolean;
/**
 * @internal
 */
export declare function rotateL<T>(P: AVLTreeNode<T>): AVLTreeNode<T>;
/**
 * @internal
 */
export declare function rotateR<T>(P: AVLTreeNode<T>): AVLTreeNode<T>;