int GetNumberOfInversions()
{
List <Tile> tiles = repository.GetAll();
int inversions = 0;
for (int i = 0; i < tiles.Count; i++)
{
int current = tiles[i].Number;
if (current == GameInfo.TilesCount)
{
continue;
}
for (int j = i; j < tiles.Count; j++)
{
if (tiles[i].Number != GameInfo.TilesCount)
{
if (current > tiles[j].Number)
{
inversions += 1;
}
}
}
}
return(inversions);
}