Interval

        public int CalculateAmount(int score1, int score2)
        {
            return LookForScoreRight(score2, root) - LookForScoreLeft(score1, root);

        }

        public int LookForScoreLeft(int score, Gamer gLeaf)
        {

            if (score > gLeaf.gScore)
            {
                if (gLeaf.right != null)
                    return LookForScoreLeft(score, gLeaf.right);
                else
                {
                    return FindNormalRank(gLeaf);
                }
            }
            else
            {
                if (gLeaf.left != null)
                    return LookForScoreLeft(score, gLeaf.left);
                else
                {
                    //if (gLeaf.parent.right==gLeaf)
                    //    return FindNormalRank(gLeaf.parent);
                    //else
                        return FindNormalRank(gLeaf)-1;
                }
            }

        }
        public int LookForScoreRight(int score, Gamer gLeaf)
        {
            if (score < gLeaf.gScore)
            {
                if (gLeaf.left != null)
                    return LookForScoreRight(score, gLeaf.left);
                else
                {
                    return FindNormalRank(gLeaf) - 1;
                }
            }
            else
            {
                if (gLeaf.right != null)
                   return LookForScoreRight(score, gLeaf.right);
                else
                    return FindNormalRank(gLeaf);
            }
        }