private void InitialUnitPropagation(out Conflict conflict)
{
conflict = null;
foreach (var clause in Clauses)
{
if (clause.Count == 1)
{
Literal literal = clause[0];
if (!literals[literal.index].HasValue)
{
AssignLiteral(literal);
var node = new TrailNode(level, literal, clause);
trail.Add(node);
UnitPropagation(node, out conflict);
if (conflict != null)
{
return;
}
}
}
}
}
public override SolverResult Run()
{
if (Running)
{
throw new InvalidOperationException("Solver is already running");
}
Running = true;
totalwatch = Stopwatch.StartNew();
InitialUnitPropagation(out Conflict conflict);
if (conflict != null)
{
Running = false;
return(SolverResult.Fail(0));
}
if (AllAssigned)
{
Running = false;
return(SolverResult.Success(0, literals));
}
if (debug)
{
Console.WriteLine();
}
while (true)
{
if (debug && latestConflict != null)
{
Console.WriteLine("- Conflict");
Console.WriteLine(trail.DebugMessage);
}
iterations++;
TrailNode node = Travel();
UnitPropagation(node, out conflict);
if (debug)
{
StateDebug();
}
if (conflict == null && AllAssigned)
{
Running = false;
return(SolverResult.Success(iterations, literals));
}
if (conflict != null && level == 0)
{
Running = false;
return(SolverResult.Fail(iterations));
}
if (conflict != null)
{
latestConflict = conflict;
}
if (timeout != 0 && totalwatch.ElapsedMilliseconds > timeout)
{
Running = false;
return(SolverResult.Timeout(iterations, (int)totalwatch.ElapsedMilliseconds));
}
}
}
