/**
 * Represents a Union-Find (Disjoint Set) data structure.
 */
export declare class UnionFind {
    private parent;
    private rank;
    /**
     * Creates a Union-Find structure with a specified size.
     * @param {number} size - The number of elements in the structure.
     */
    constructor(size: number);
    /**
     * Finds the root of the set containing the element.
     * @param {number} element - The element to find.
     * @returns {number} The root of the set.
     */
    find(element: number): number;
    /**
     * Unites two sets.
     * @param {number} element1 - The first element.
     * @param {number} element2 - The second element.
     */
    union(element1: number, element2: number): void;
    /**
     * Checks if two elements are in the same set.
     * @param {number} element1 - The first element.
     * @param {number} element2 - The second element.
     * @returns {boolean} True if they are in the same set, false otherwise.
     */
    connected(element1: number, element2: number): boolean;
}