private static void FindAdjacent(int[][] blocks, int color, RC rc, List <RC> cells)
{
if (!rc.IsValid() || cells.Contains(rc) || blocks[rc.Row][rc.Column] <= 0)
{
return;
}
if (blocks[rc.Row][rc.Column] == color)
{
cells.Add(rc);
FindAdjacent(blocks, color, new RC(rc.Row + 1, rc.Column), cells);
FindAdjacent(blocks, color, new RC(rc.Row - 1, rc.Column), cells);
FindAdjacent(blocks, color, new RC(rc.Row, rc.Column + 1), cells);
FindAdjacent(blocks, color, new RC(rc.Row, rc.Column - 1), cells);
}
}