import { UnionFind } from './UnionFind';
export declare class UnionByRank extends UnionFind {
    private ranks;
    /**
     * Creates UnionByRank class with given size
     * @param {number} size size of the set, default size is 16
     */
    constructor(size?: number);
    /**
     * Returns root of given node
     * @param {number} x arbitrary node
     * @returns {number} root of give node
     */
    find(x: number): number;
    /**
     * Connects nodes x and y with quick union strategy
     * @param {number} x node x
     * @param {number} y node y
     * @returns {void}
     */
    uion(x: number, y: number): void;
}