public ProblemAction[] Actions(ProblemState <T> state)
{
var(rowNumber, columnNumber) = state.FindEmpty();
var actions = new List <ProblemAction>();
if (columnNumber > 0)
{
actions.Add(ProblemAction.Left);
}
if (columnNumber < state.GetLength(0) - 1)
{
actions.Add(ProblemAction.Right);
}
if (rowNumber > 0)
{
actions.Add(ProblemAction.Up);
}
if (rowNumber < state.GetLength(1) - 1)
{
actions.Add(ProblemAction.Down);
}
return(actions.ToArray());
}
public ProblemState <T> Result(ProblemState <T> state, ProblemAction action)
{
var(rowNumber, columnNumber) = state.FindEmpty();
var transitionState = new ProblemState <T>(state.GetLength(0), state.GetLength(1));
ProblemState <T> .Copy(state, transitionState, state.Length);
int row = rowNumber, col = columnNumber;
if (action == ProblemAction.Up)
{
row = rowNumber - 1;
}
if (action == ProblemAction.Down)
{
row = rowNumber + 1;
}
if (action == ProblemAction.Left)
{
col = columnNumber - 1;
}
if (action == ProblemAction.Right)
{
col = columnNumber + 1;
}
transitionState[row, col] = state[rowNumber, columnNumber];
transitionState[rowNumber, columnNumber] = state[row, col];
return(transitionState);
}