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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Lerochka
{
    public class Symbol
    {
        public Symbol(char value)
        {
            this.Value = value;
            this.Count = 1;
        }
        public char Value { get; set; }
        public int Count { get; set; }
    }

    public class Symbols
    {
        public Symbol[] symbols;
        private int count;
        public Symbols()
        {
            this.symbols = new Symbol[0];
            this.count = 0;
        }
        public void Add(Symbol symbol)
        {
            Symbol[] symbols_ = new Symbol[symbols.Length + 1];
            Array.Copy(symbols, symbols_, symbols.Length);
            symbols = symbols_;
            symbols[count++] = symbol;
        }
        public bool Find(char x)
        {
            if (symbols.Length == 0)
            {
                return false;
            }
            else if (Array.Exists(symbols, elem => elem.Value == x))
            {
                return true;
            }
            else return false;
        }
        public int Index(char x)
        {
            int t = 0;
            foreach (Symbol temp in symbols)
            {
                if (temp.Value.Equals(x))
                {
                    return t;
                }
                t++;
            }
            return -1;
        }
        public void CountUp(int index)
        {
            symbols[index].Count++;
        }
        public override string ToString()
        {
            string t = "";
            foreach (Symbol x in symbols)
            {
                t += "(" + x.Value + ":" + x.Count + ") ";
            }
            return t;
        }
    }
    class Program
    {
        static int Factorial(int a)
        {
            int count = 1;
            int aFact = 1;
            while (count <= a)
            {
                aFact = aFact * count;
                count++;
            }
            return aFact;
        }
        static int Perestanovki_s_Povt(Symbol[] symbols)
        {
            int chisl = 0;
            int znam = 1;
            for (int i = 0; i < symbols.Length; i++)
            {
                chisl += symbols[i].Count;
                znam *= Factorial(symbols[i].Count);
            }
            chisl = Factorial(chisl);
            return chisl / znam;
        }
        static void Main(string[] args)
        {
            Console.Write("Введите исходный текст: ");
            string text = Console.ReadLine();
            Symbols symbols = new Symbols();
            foreach (char x in text)
            {
                if (symbols.Find(x))
                {
                    symbols.CountUp(symbols.Index(x));
                }
                else
                {
                    symbols.Add(new Symbol(x));
                }
            }
            Console.WriteLine("Элементы строки в виде (элемент:количество): " + symbols.ToString());
            Console.WriteLine("Количество возможных перестановок с повторениями = " + Perestanovki_s_Povt(symbols.symbols));
            Console.ReadLine();
        }
    }
}

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