static async Task Main(string[] args)
{
// Useful for quickly testing a puzzle without changing commandline parameters
#if false
args = new string[]
{
@"-f=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",
//"-b=9",
//"-c=renban:r1-6c1",
//"-c=chess:v1,2,3,4,5,6,7;1,1;2,2;3,3;4,4;5,5;6,6;7,7;8,8",
//"-c=ratio:neg2",
//"-c=difference:neg1",
//"-c=taxi:4",
//"-o=candidates.txt",
//"-uv",
//"-st",
"-ps",
};
#endif
Stopwatch watch = Stopwatch.StartNew();
string processName = Process.GetCurrentProcess().ProcessName;
bool showHelp = args.Length == 0;
string fpuzzlesURL = null;
string givens = null;
string blankGridSizeString = null;
string outputPath = null;
List <string> constraints = new();
bool multiThread = false;
bool solveBruteForce = false;
bool solveRandomBruteForce = false;
bool solveLogically = false;
bool solutionCount = false;
bool sortSolutionCount = false;
bool check = false;
bool trueCandidates = false;
bool fpuzzlesOut = false;
bool visitURL = false;
bool print = false;
string candidates = null;
bool listen = false;
string portStr = null;
ulong maxSolutionCount = 0;
var options = new OptionSet {
// Non-solve options
{ "h|help", "Show this message and exit.", h => showHelp = h != null },
// Input board options
{ "b|blank=", "Use a blank grid of a square size.", b => blankGridSizeString = b },
{ "g|givens=", "Provide a digit string to represent the givens for the puzzle.", g => givens = g },
{ "a|candidates=", "Provide a candidate string of height^3 numbers.", a => candidates = a },
{ "f|fpuzzles=", "Import a full f-puzzles URL (Everything after '?load=').", f => fpuzzlesURL = f },
{ "c|constraint=", "Provide a constraint to use.", c => constraints.Add(c) },
// Pre-solve options
{ "p|print", "Print the input board.", p => print = p != null },
// Solve options
{ "s|solve", "Provide a single brute force solution.", s => solveBruteForce = s != null },
{ "d|random", "Provide a single random brute force solution.", d => solveRandomBruteForce = d != null },
{ "l|logical", "Attempt to solve the puzzle logically.", l => solveLogically = l != null },
{ "r|truecandidates", "Find the true candidates for the puzzle (union of all solutions).", r => trueCandidates = r != null },
{ "k|check", "Check if there are 0, 1, or 2+ solutions.", k => check = k != null },
{ "n|solutioncount", "Provide an exact solution count.", n => solutionCount = n != null },
{ "x|maxcount=", "Specify an maximum solution count.", x => maxSolutionCount = x != null?ulong.Parse(x) : 0 },
{ "t|multithread", "Use multithreading.", t => multiThread = t != null },
// Post-solve options
{ "o|out=", "Output solution(s) to file.", o => outputPath = o },
{ "z|sort", "Sort the solution count (requires reading all solutions into memory).", sort => sortSolutionCount = sort != null },
{ "u|url", "Write solution as f-puzzles URL.", u => fpuzzlesOut = u != null },
{ "v|visit", "Automatically visit the output URL with default browser (combine with -u).", v => visitURL = v != null },
// Websocket options
{ "listen", "Listen for websocket connections", l => listen = l != null },
{ "port=", "Change the listen port for websocket connections (default 4545)", p => portStr = p },
};
List <string> extra;
try
{
// parse the command line
extra = options.Parse(args);
}
catch (Exception e)
{
// output some error message
Console.WriteLine($"{processName}: {e.Message}");
Console.WriteLine($"Try '{processName} --help' for more information.");
return;
}
if (showHelp)
{
Console.WriteLine($"SudokuSolver version {SudokuSolverVersion.version} created by David Clamage (\"Rangsk\").");
Console.WriteLine("https://github.com/dclamage/SudokuSolver");
Console.WriteLine();
Console.WriteLine("Options:");
options.WriteOptionDescriptions(Console.Out);
Console.WriteLine();
Console.WriteLine("Constraints:");
List <string> constraintNames = ConstraintManager.ConstraintAttributes.Select(attr => $"{attr.ConsoleName} ({attr.DisplayName})").ToList();
constraintNames.Sort();
foreach (var constraintName in constraintNames)
{
Console.WriteLine($"\t{constraintName}");
}
return;
}
if (listen)
{
int port = 4545;
if (!string.IsNullOrWhiteSpace(portStr))
{
port = int.Parse(portStr);
}
using WebsocketListener websocketListener = new();
await websocketListener.Listen("localhost", port);
Console.WriteLine("Press CTRL + Q to quit.");
while (true)
{
ConsoleKeyInfo key = Console.ReadKey(true);
if (key.Modifiers == ConsoleModifiers.Control && key.Key == ConsoleKey.Q)
{
return;
}
}
}
bool haveFPuzzlesURL = !string.IsNullOrWhiteSpace(fpuzzlesURL);
bool haveGivens = !string.IsNullOrWhiteSpace(givens);
bool haveBlankGridSize = !string.IsNullOrWhiteSpace(blankGridSizeString);
bool haveCandidates = !string.IsNullOrWhiteSpace(candidates);
if (!haveFPuzzlesURL && !haveGivens && !haveBlankGridSize && !haveCandidates)
{
Console.WriteLine($"ERROR: Must provide either an f-puzzles URL or a givens string or a blank grid or a candidates string.");
Console.WriteLine($"Try '{processName} --help' for more information.");
showHelp = true;
}
int numBoardsSpecified = 0;
if (haveFPuzzlesURL)
{
numBoardsSpecified++;
}
if (haveGivens)
{
numBoardsSpecified++;
}
if (haveBlankGridSize)
{
numBoardsSpecified++;
}
if (haveCandidates)
{
numBoardsSpecified++;
}
if (numBoardsSpecified != 1)
{
Console.WriteLine($"ERROR: Cannot provide more than one set of givens (f-puzzles URL, given string, blank grid, candidates).");
Console.WriteLine($"Try '{processName} --help' for more information.");
return;
}
Solver solver;
try
{
if (haveBlankGridSize)
{
if (int.TryParse(blankGridSizeString, out int blankGridSize) && blankGridSize > 0 && blankGridSize < 32)
{
solver = SolverFactory.CreateBlank(blankGridSize, constraints);
}
else
{
Console.WriteLine($"ERROR: Blank grid size must be between 1 and 31");
Console.WriteLine($"Try '{processName} --help' for more information.");
return;
}
}
else if (haveGivens)
{
solver = SolverFactory.CreateFromGivens(givens, constraints);
}
else if (haveFPuzzlesURL)
{
solver = SolverFactory.CreateFromFPuzzles(fpuzzlesURL, constraints);
Console.WriteLine($"Imported \"{solver.Title ?? "Untitled"}\" by {solver.Author ?? "Unknown"}");
}
else // if (haveCandidates)
{
solver = SolverFactory.CreateFromCandidates(candidates, constraints);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return;
}
if (print)
{
Console.WriteLine("Input puzzle:");
solver.Print();
}
if (solveLogically)
{
Console.WriteLine("Solving logically:");
StringBuilder stepsDescription = new();
var logicResult = solver.ConsolidateBoard(stepsDescription);
Console.WriteLine(stepsDescription);
if (logicResult == LogicResult.Invalid)
{
Console.WriteLine($"Board is invalid!");
}
solver.Print();
if (outputPath != null)
{
try
{
using StreamWriter file = new(outputPath);
await file.WriteLineAsync(solver.OutputString);
}
catch (Exception e)
{
Console.WriteLine($"Failed to write to file: {e.Message}");
}
}
if (fpuzzlesOut)
{
OpenFPuzzles(solver, visitURL);
}
}
if (solveBruteForce)
{
Console.WriteLine("Finding a solution with brute force:");
if (!solver.FindSolution(multiThread: multiThread))
{
Console.WriteLine($"No solutions found!");
}
else
{
solver.Print();
if (outputPath != null)
{
try
{
using StreamWriter file = new(outputPath);
await file.WriteLineAsync(solver.OutputString);
}
catch (Exception e)
{
Console.WriteLine($"Failed to write to file: {e.Message}");
}
}
if (fpuzzlesOut)
{
OpenFPuzzles(solver, visitURL);
}
}
}
if (solveRandomBruteForce)
{
Console.WriteLine("Finding a random solution with brute force:");
if (!solver.FindSolution(multiThread: multiThread, isRandom: true))
{
Console.WriteLine($"No solutions found!");
}
else
{
solver.Print();
if (outputPath != null)
{
try
{
using StreamWriter file = new(outputPath);
await file.WriteLineAsync(solver.OutputString);
}
catch (Exception e)
{
Console.WriteLine($"Failed to write to file: {e.Message}");
}
}
if (fpuzzlesOut)
{
OpenFPuzzles(solver, visitURL);
}
}
}
if (trueCandidates)
{
Console.WriteLine("Finding true candidates:");
int currentLineCursor = Console.CursorTop;
object consoleLock = new();
if (!solver.FillRealCandidates(multiThread: multiThread, progressEvent: (uint[] board) =>
{
uint[,] board2d = new uint[solver.HEIGHT, solver.WIDTH];
for (int i = 0; i < solver.HEIGHT; i++)
{
for (int j = 0; j < solver.WIDTH; j++)
{
int cellIndex = i * solver.WIDTH + j;
board2d[i, j] = board[cellIndex];
}
}
lock (consoleLock)
{
ConsoleUtility.PrintBoard(board2d, solver.Regions, Console.Out);
Console.SetCursorPosition(0, currentLineCursor);
}
}))
{
Console.WriteLine($"No solutions found!");
}
else
{
solver.Print();
if (outputPath != null)
{
try
{
using StreamWriter file = new(outputPath);
await file.WriteLineAsync(solver.OutputString);
}
catch (Exception e)
{
Console.WriteLine($"Failed to write to file: {e.Message}");
}
}
if (fpuzzlesOut)
{
OpenFPuzzles(solver, visitURL);
}
}
}
if (solutionCount)
{
Console.WriteLine("Finding solution count...");
try
{
Action <Solver> solutionEvent = null;
using StreamWriter file = (outputPath != null) ? new(outputPath) : null;
if (file != null)
{
solutionEvent = (Solver solver) =>
{
try
{
file.WriteLine(solver.GivenString);
}
catch (Exception e)
{
Console.WriteLine($"Failed to write to file: {e.Message}");
}
};
}
ulong numSolutions = solver.CountSolutions(maxSolutions: maxSolutionCount, multiThread: multiThread, progressEvent: (ulong count) =>
{
ReplaceLine($"(In progress) Found {count} solutions in {watch.Elapsed}.");
},
solutionEvent: solutionEvent);
if (maxSolutionCount > 0)
{
numSolutions = Math.Min(numSolutions, maxSolutionCount);
}
if (maxSolutionCount == 0 || numSolutions < maxSolutionCount)
{
ReplaceLine($"\rThere are exactly {numSolutions} solutions.");
}
else
{
ReplaceLine($"\rThere are at least {numSolutions} solutions.");
}
Console.WriteLine();
if (file != null && sortSolutionCount)
{
Console.WriteLine("Sorting...");
file.Close();
string[] lines = await File.ReadAllLinesAsync(outputPath);
Array.Sort(lines);
await File.WriteAllLinesAsync(outputPath, lines);
Console.WriteLine("Done.");
}
}
catch (Exception e)
{
Console.WriteLine($"ERROR: {e.Message}");
}
}
if (check)
{
Console.WriteLine("Checking...");
ulong numSolutions = solver.CountSolutions(2, multiThread);
Console.WriteLine($"There are {(numSolutions <= 1 ? numSolutions.ToString() : "multiple")} solutions.");
}
watch.Stop();
Console.WriteLine($"Took {watch.Elapsed}");
}