private IEnumerable <BoardPoint> GetNeighbors(BoardPoint point, GameBoard board)
{
{
var neighbor = point.ShiftLeft();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftRight();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftTop();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftBottom();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
}
static bool isNotDeadEnd2(GameBoard gameBoard, BoardPoint point) => incrementIfNotDeadEnd(gameBoard, point.ShiftRight()) + incrementIfNotDeadEnd(gameBoard, point.ShiftTop()) + incrementIfNotDeadEnd(gameBoard, point.ShiftBottom()) + incrementIfNotDeadEnd(gameBoard, point.ShiftLeft()) > 1;
static bool canLeft(GameBoard gameBoard, BoardPoint head) => prevDirection != Direction.Right && !badElements.Contains(gameBoard.GetElementAtOrWall(head.ShiftLeft()));
