/* cdok -- Calcudoku solver/generator
 * Copyright (C) 2012 Daniel Beer <dlbeer@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef SOLVER_H_
#define SOLVER_H_

#include "cdok.h"

/* Attempt to solve the given puzzle, optionally producing a solution,
 * if it exists, and a difficulty score.
 *
 * Return values are:
 *
 *    -1: the puzzle is unsolvable
 *     0: the puzzle is uniquely solvable
 *     1: the puzzle is solvable, but the solution is not unique
 */
int cdok_solve(const struct cdok_puzzle *puz, uint8_t *solution, int *diff);

#endif