export interface SudokuCell {
    id: `y=${number},x=${number}`;
    x: number;
    y: number;
    box: SudokuCell[];
    row: SudokuCell[];
    column: SudokuCell[];
    validators: Set<SudokuCell>;
    candidates: Set<number>;
    value: number;
}
export type SudokuChange = {
    type: 'assignment';
    x: number;
    y: number;
    value: number;
} | {
    type: 'candidate';
    x: number;
    y: number;
    value: number;
};
export declare class SudokuSolver {
    output: {
        grid: number[][];
        candidates: number[][][];
        changes: SudokuChange[];
    };
    protected grid: number[][];
    size: number;
    blockSize: number;
    protected boxes: SudokuCell[][][];
    columns: SudokuCell[][];
    rows: SudokuCell[][];
    protected cells: SudokuCell[];
    protected allCandidates: Set<number>;
    constructor(sudoku: number[][] | {
        sudoku: string;
        delimiter: string;
    });
    protected updateCellValue(cell: SudokuCell, value: number): void;
    protected removeCellCandidate(cell: SudokuCell, value: number): void;
    removeInvalidCandidates(): void;
    applyNakedSingles(): void;
    applyNakedGroup(size: number): void;
    applyHiddenGroup(size: number): void;
    findEmptyCell(): {
        cell?: undefined;
        candidates?: undefined;
    } | {
        cell: SudokuCell;
        candidates: Set<number>;
    };
    bruteForce(): boolean;
    printCells(): void;
    solve(): void;
}
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