/**
 * Finds possible entries for a specific field in a Sudoku puzzle.
 * @param sudoku the Sudoku puzzle to check
 * @param row row of the field to check
 * @param column column of the field to check
 * @returns possible entries which are not yet in conflict with any other field
 */
export declare function getPossibleEntries(sudoku: number[][], row: number, column: number): number[];
/**
 * Generates a new Sudoku puzzle with the exact same entries.
 * @param sudoku Sudoku puzzle to clone
 * @returns clone of the Sudoku puzzle
 */
export declare function cloneSudoku(sudoku: number[][]): number[][];
/**
 * Checks whether a Sudoku puzzle is completely solved. In particular, this functions checks that every number is used exactly once in every row, column, and box.
 * @param sudoku the Sudoku puzzle to check
 * @returns true if, and only if, the Sudoku puzzle is completely and correctly solved
 */
export declare function isCorrectlySolved(sudoku: number[][]): boolean;
/**
 * Checks for each row of the Sudoku puzzle whether every number is used exactly once.
 * @param sudoku the Sudoku puzzle to check
 * @returns true, if and only if, every number is used exactly once in every row
 */
export declare function allRowsValid(sudoku: number[][]): boolean;
/**
 * Checks for each column of the Sudoku puzzle whether every number is used exactly once.
 * @param sudoku the Sudoku puzzle to check
 * @returns true, if and only if, every number is used exactly once in every column
 */
export declare function allColumnsValid(sudoku: number[][]): boolean;
/**
 * Checks for each box of the Sudoku puzzle whether every number is used exactly once.
 * @param sudoku the Sudoku puzzle to check
 * @returns true, if and only if, every number is used exactly once in every box
 */
export declare function allBoxesValid(sudoku: number[][]): boolean;
/**
 * Calculates the first row of a box in a Sudoku puzzle. The boxes are counted row-wise.
 * @param boxNumber number of the box in the Sudoku puzzle (counted row-wise)
 * @returns first row of the box
 */
export declare function getFirstRowOfBox(boxNumber: number): number;
/**
 * Calculates the first column of a box in a Sudoku puzzle. The boxes are counted row-wise.
 * @param boxNumber number of the box in the Sudoku puzzle (counted row-wise)
 * @returns first column of the box
 */
export declare function getFirstColumnOfBox(boxNumber: number): number;