Camden Dixie O'Brien
512580ab27
I expect this will probably generate some impossible puzzles, but I'll deal with that later.
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* Copyright (C) 2022 Camden Dixie O'Brien
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this program. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#ifndef SUD_H
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#define SUD_H
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#include <stdbool.h>
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#define SIDELEN 9
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#define SEGLEN 3
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#define NDIGITS 9
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struct cellstate {
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bool det;
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union {
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unsigned val;
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bool pvals[NDIGITS];
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};
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};
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struct sudoku {
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struct cellstate cells[SIDELEN][SIDELEN];
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};
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enum update_res { NOT_ALLOWED, ALREADY_DET, OK };
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/**
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* Populate the sudoku with some random values.
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*/
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void gen(struct sudoku *sud);
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/**
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* Attempt to update the cell at row `r`, column `c` to have the value
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* `val`. Returns `OK` on success, `ALREADY_DET` if the cell is
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* already determined or `NOT_ALLOWED` if the cell being `val` would
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* violate the sudoku rules.
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*/
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enum update_res
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update(struct sudoku *sud, unsigned r, unsigned c, unsigned val);
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/**
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* Print a string representation of the sudoku to stdout.
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*/
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void print(const struct sudoku *sud);
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#endif
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