Anagrams | C# Online Compiler

Anagrams by Lau...

using System;
using System.Linq;
using System.Numerics;


/*
Results:
When I upload it on a site I get this errors.
Failed compilation.
CS0246 (Error) : Type or namespace name 'BigInteger' could not be found (missing using directive or assembly directive

CS0246 (Error) : Type or namespace name 'BigInteger' could not be found (missing a using directive or assembly reference?) (line: 25, character: 19)

CS0246 (Error) : The type or name of the namespace 'BigInteger' could not be found (missing a using directive or assembly reference?) (line: 17, character: 8)

CS1061 (Error) : 'string' does not contain a definition for 'GroupBy' and no accessible 'GroupBy' extension method could be found that accepts a first argument of type 'string' (missing a using directive or assembly reference?) (line: 31, character: 11)
*/


public class Program
{
     static void Main(string[] args)

    {
        string tests = Console.ReadLine();  
        
        Console.WriteLine(CountAnagrams(tests));
    }

        private static BigInteger Factorial(int value)
    {
        BigInteger result = 1;

        for (int i = 2; i <= value; ++i)
            result *= i;

        return result;
    }

    private static BigInteger CountAnagrams(string value)
    {
        if (string.IsNullOrEmpty(value))
            return 1;

        return value
          .GroupBy(c => c)
          .Aggregate(Factorial(value.Length), (s, group) => s / Factorial(group.Count()));
    }
    
}

​x
 
using System;
using System.Linq;
using System.Numerics;
​
​
/*
Results:
When I upload it on a site I get this errors.
Failed compilation.
CS0246 (Error) : Type or namespace name 'BigInteger' could not be found (missing using directive or assembly directive
​
CS0246 (Error) : Type or namespace name 'BigInteger' could not be found (missing a using directive or assembly reference?) (line: 25, character: 19)
​
CS0246 (Error) : The type or name of the namespace 'BigInteger' could not be found (missing a using directive or assembly reference?) (line: 17, character: 8)
​
CS1061 (Error) : 'string' does not contain a definition for 'GroupBy' and no accessible 'GroupBy' extension method could be found that accepts a first argument of type 'string' (missing a using directive or assembly reference?) (line: 31, character: 11)
*/
​
​
public class Program
{
     static void Main(string[] args)
​
    {
        string tests = Console.ReadLine();  
        
        Console.WriteLine(CountAnagrams(tests));
    }
​
        private static BigInteger Factorial(int value)
    {
        BigInteger result = 1;
​
        for (int i = 2; i <= value; ++i)
            result *= i;
​
        return result;
    }
​
    private static BigInteger CountAnagrams(string value)
    {
        if (string.IsNullOrEmpty(value))
            return 1;
​
        return value
          .GroupBy(c => c)
          .Aggregate(Factorial(value.Length), (s, group) => s / Factorial(group.Count()));
    }
    
}

Priletel k nam drak -- zivot:200 sila:32
Bojovat s nim bude rytir -- zivot:100 sila:9
drak -- zivot:191 sila:32
rytir -- zivot:68 sila:9
drak -- zivot:182 sila:32
rytir -- zivot:36 sila:9
drak -- zivot:173 sila:32
rytir -- zivot:4 sila:9
drak -- zivot:164 sila:32
rytir -- zivot:-28 sila:9
Bojovat s nim bude rytir -- zivot:80 sila:12
drak -- zivot:152 sila:32
rytir -- zivot:48 sila:12
drak -- zivot:140 sila:32
rytir -- zivot:16 sila:12
drak -- zivot:128 sila:32
rytir -- zivot:-16 sila:12
Bojovat s nim bude rytir -- zivot:110 sila:11
drak -- zivot:117 sila:32
rytir -- zivot:78 sila:11
drak -- zivot:106 sila:32
rytir -- zivot:46 sila:11
drak -- zivot:95 sila:32
rytir -- zivot:14 sila:11
drak -- zivot:84 sila:32
rytir -- zivot:-18 sila:11
Bojovat s nim bude rytir -- zivot:100 sila:14
drak -- zivot:70 sila:32
rytir -- zivot:68 sila:14
drak -- zivot:56 sila:32
rytir -- zivot:36 sila:14
drak -- zivot:42 sila:32
rytir -- zivot:4 sila:14
drak -- zivot:28 sila:32
rytir -- zivot:-28 sila:14
Bojovat s nim bude rytir -- zivot:130 sila:12
drak -- zivot:16 sila:32
rytir -- zivot:98 sila:12
drak -- zivot:4 sila:32
rytir -- zivot:66 sila:12
drak -- zivot:-8 sila:32
rytir -- zivot:34 sila:12

Vsichni rytiri:
rytir -- zivot:-28 sila:9 (cest jeho pamatce!)
rytir -- zivot:-16 sila:12 (cest jeho pamatce!)
rytir -- zivot:-18 sila:11 (cest jeho pamatce!)
rytir -- zivot:-28 sila:14 (cest jeho pamatce!)
rytir -- zivot:34 sila:12
rytir -- zivot:100 sila:8
rytir -- zivot:70 sila:14

Last Run:	3:38:53 pm
Compile:	0.121s
Execute:	0s
Memory:	64kb
CPU:	0.016s

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