Example #1
0
        private void ClearAndSolve(Domain.Sudoku sudoku, int currentIndex, Enums.TopType type, int count)
        {
            _currentIterationsCount = 0;
            _solutions.Clear();

            SolveBruteForce(sudoku, currentIndex, type, count);
        }
Example #2
0
        public async Task TestTopNSolutions(string path, int solutionsLimit, Enums.TopType type, int expectedDifficulty)
        {
            var absPath = Path.Combine(TestContext.CurrentContext.TestDirectory, path);

            var sudoku = await SudokuAdapter.ReadFromFileAsync(absPath);

            var solver = new SimpleSolver();

            var solutions = solver.GetTopNSolutions(sudoku, solutionsLimit, type);

            Assert.AreEqual(solutionsLimit, solutions.Count);
            Assert.AreEqual(expectedDifficulty, solutions.First().DifficultyPoints);
        }
Example #3
0
        private bool SolveBruteForce(Domain.Sudoku sudoku, int currentIndex, Enums.TopType type, int count)
        {
            while (true)
            {
                if (currentIndex == Domain.Sudoku.BigSide * Domain.Sudoku.BigSide)
                {
                    var solutionBoard = sudoku.Copy();
                    solutionBoard.DifficultyPoints = _currentIterationsCount;
                    _solutions.Add(solutionBoard);
                    return(true);
                }
                else
                {
                    var row    = currentIndex / Domain.Sudoku.BigSide;
                    var column = currentIndex % Domain.Sudoku.BigSide;

                    if (sudoku[row, column] != 0)
                    {
                        currentIndex = currentIndex + 1;
                        continue;
                    }

                    for (var i = 1; i <= Domain.Sudoku.BigSide; i++)
                    {
                        _currentIterationsCount++;
                        if (!Validations.ConsistentIfPut(sudoku, row, column, i))
                        {
                            continue;
                        }

                        sudoku[row, column] = i;
                        if (SolveBruteForce(sudoku, currentIndex + 1, type, count) &&
                            (type == Enums.TopType.Any || type == Enums.TopType.Easiest) && _solutions.Count >= count)
                        {
                            return(true);
                        }
                        sudoku[row, column] = 0;
                    }
                }

                return(false);
            }
        }
Example #4
0
        /// <summary>
        /// Solve sudoku and return given number of solutions in given order
        /// </summary>
        /// <param name="sudoku"> Sudoku to solve </param>
        /// <param name="count"> Number of solutions to return </param>
        /// <param name="topType"> Sort order </param>
        /// <returns></returns>
        public List <Domain.Sudoku> GetTopNSolutions(Domain.Sudoku sudoku, int count, Enums.TopType topType)
        {
            if (sudoku == null)
            {
                throw  new ArgumentNullException(nameof(sudoku));
            }
            if (count < 0)
            {
                throw new Exception("Number of solutions can not be negative value");
            }

            ClearAndSolve(sudoku.Copy(), 0, topType, count);

            return(topType == Enums.TopType.Hardest
                                ? _solutions.Skip(Math.Max(0, _solutions.Count - count)).ToList()
                                : _solutions.ToList());
        }