/// <summary>
/// To check if a puzzle has only one solution or not.
/// </summary>
/// <param name="this">(<see langword="this"/> parameter) The puzzle to check.</param>
/// <param name="solutionIfValid">
/// (<see langword="out"/> parameter) The solution if the puzzle is valid;
/// otherwise, <see langword="null"/>.
/// </param>
/// <returns>A <see cref="bool"/> value indicating that.</returns>
public static bool IsValid(this IReadOnlyGrid @this, [NotNullWhen(true)] out IReadOnlyGrid?solutionIfValid)
{
solutionIfValid = null;
if (new BitwiseSolver().CheckValidity(@this.ToString(), out string?solution) ||
new SukakuBitwiseSolver().CheckValidity(@this.ToString("~"), out solution))
{
solutionIfValid = Grid.Parse(solution);
return(true);
}
else
{
return(false);
}
}
/// <inheritdoc/>
public override AnalysisResult Solve(IReadOnlyGrid grid)
{
string str = grid.ToString(".");
var sb = new CStyleString(82);
var stopwatch = new Stopwatch();
try
{
stopwatch.Start();
int count = Solve32(str, sb, 2);
stopwatch.Stop();
return(count switch
{
0 => throw new NoSolutionException(grid),
1 =>
new AnalysisResult(
puzzle: grid,
solverName: SolverName,
hasSolved: true,
solution: Grid.Parse(sb.ToString()),
elapsedTime: stopwatch.Elapsed,
solvingList: null,
additional: null,
stepGrids: null),
_ => throw new MultipleSolutionsException(grid)
});
}
/// <inheritdoc/>
public override AnalysisResult Solve(IReadOnlyGrid grid)
{
var stopwatch = new Stopwatch();
stopwatch.Start();
var results = SolveStrings(grid.ToString("0"));
stopwatch.Stop();
return(results.Count switch
{
0 => throw new NoSolutionException(grid),
1 =>
new AnalysisResult(
puzzle: grid,
solverName: SolverName,
hasSolved: true,
solution: Grid.Parse(results[0]),
elapsedTime: stopwatch.Elapsed,
solvingList: null,
additional: null,
stepGrids: null),
_ => throw new MultipleSolutionsException(grid)
});