static void Main(string[] args)
{
    int A = 100;
    int B = 50;           

    Console.WriteLine("Начальные значения:\t A={0}, B={1}",A,B);

    A = A + B;
    B = A - (int)Math.Pow((A - B) / (A - (A - B)), ((A - (A - B)) / (A - B))) * B - (int)Math.Pow((A - (A - B)) / (A - B), (A - B) / (A - (A - B))) * (A - B);
    A = A - B;

    Console.WriteLine("Конечные значения:\t A={0}, B={1}", A, B);

    Console.ReadKey();
}

        
static int Factorial(int ANumber)
{
    int AValue = 1;

    for (int Idx = 2; Idx <= ANumber; Idx++)
    {
        AValue = AValue * Idx;
    }

    return AValue * (ANumber > 1 ? Factorial(ANumber - 1) : 1);
}

static void Main(string[] args)
{
    byte N = 4;
    Console.WriteLine("Результат:{0}", Factorial(N));
    Console.ReadKey();
}

static void Main(string[] args)
{
    int[] A = new int[10] { 0, 3, 2, 5, 4, 6, 8, 9, 10, 1 };

    int? K = null; int J = 0;
    for (int I = 0; I < A.Length; I++)
    {
        if (K != null)
        {
            if (A[I] == K)
            {
                I = J; K = null;
            }
        }
        else if (I < A.Length - 1 && A[I] + 1 == A[I + 1] - 1)
        {
            K = A[I] + 1; J = I; I = 0;
        }
    }
    Console.WriteLine("{0}", K);

    Console.ReadKey();
}

DECLARE @T TABLE 
(
  [ID] Int IDENTITY(1,1),
  [String] VarChar(200) 
) 

INSERT INTO @T([String]) VALUES
('мама мыла раму'),
('раму мыла мама'),
('мама раму мыла и мыла и мыла...')

DECLARE @StrSearch VarChar(100) = 'мыла'

;WITH CTE AS 
(
  SELECT 
   [ID],
   [String]     = CAST(SUBSTRING ( [String], 1, CHARINDEX ( @StrSearch, [String] ) - 1 ) + SUBSTRING ( [String], CHARINDEX ( @StrSearch, [String] ) + LEN ( @StrSearch ), LEN ( [String] ) ) AS VarChar(200)),
   [Count]      = 1
  FROM   @T
  WHERE  CHARINDEX ( @StrSearch, [String] ) > 0
  UNION ALL 
  SELECT 
   [ID]         = CTE.[ID],
   [String]     = CAST(SUBSTRING ( CTE.[String], 1, CHARINDEX ( @StrSearch, CTE.[String] ) - 1 ) + SUBSTRING ( CTE.[String], CHARINDEX ( @StrSearch, CTE.[String] ) + LEN ( @StrSearch ), LEN ( CTE.[String] ) ) AS VarChar(200)),
   [Count]      = [Count] + 1
  FROM   CTE 
  INNER JOIN @T T ON T.[ID] = CTE.[ID] 
  WHERE  CHARINDEX ( @StrSearch, CTE.[String] ) > 0
) 
SELECT 
  '[ ' + CAST(T.[ID] AS VarChar) + ' ] [ ' + T.[String] + ' ] [ ' + CAST(ISNULL(Q.[Value], 0) AS VarChar) + ' ] [ ' + CAST(ISNULL(Q.[Value] * 100 / M.[Value], 0) AS VarChar) + '% ]'
FROM @T T
LEFT  JOIN (SELECT [Value] = SUM([Value]) FROM (SELECT [Value] = MAX([Count]) FROM CTE GROUP BY [ID]) T) M ON 1 = 1
OUTER APPLY (SELECT [Value] = MAX([Count]) FROM CTE WHERE [ID] = T.[ID]) Q

 class Program
        {
            private static List<List<int>> NumericSeries(int N)
            {
                List<List<int>> AResult = new List<List<int>>();
                
                List<int> ASeries = new List<int>();

                for(int Idx = 1; Idx < N; Idx++)
                {
                    ASeries.Add(Idx);
                }
                
                List<int> AList = new List<int>();
                int I = ASeries.Count; int Sum = 0;                
                
                do
                {
                    I -= 1;

                    while (true)
                    {
                        if (Sum + ASeries[I] <= N)
                        {
                            AList.Add(ASeries[I]);
                            Sum += ASeries[I];
                        }
                        else
                        {
                            break;
                        }
                    }

                    if (Sum == N)
                    {
                        Sum = 0; I = ASeries.IndexOf(AList[0]); AResult.Add(new List<int>(AList)); AList.Clear();
                    }

                } while (I > 0);

                return AResult;
            }

            static void Main(string[] args)
            {
                int N;

                Console.Write("Введите число:");
                if (int.TryParse(Console.ReadLine(), out N) == true)
                {
                    foreach (List<int> AList in NumericSeries(N))
                    {
                        Console.WriteLine(string.Join("+", AList.ConvertAll(new Converter<int, string>(Convert.ToString)).ToArray()));

                        for (int I = AList.Count - 1; I > 0; I--)
                        {
                            if (AList[I] > 1)
                            {
                                N = AList[I]; AList.RemoveAt(I); AList.InsertRange(I, NumericSeries(N)[0]); I = AList.Count;

                                Console.WriteLine(string.Join("+", AList.ConvertAll(new Converter<int, string>(Convert.ToString)).ToArray()));
                            }
                        }
                    }
                }
                
                Console.ReadKey();
            }