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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace ASD_PS2
{
class Program
{
static void Main(string[] args)
{
StreamReader sr = new StreamReader("A_PS10_Ugniewski.txt");
string s = sr.ReadLine();
string[] wejscie = s.Split(' ');
int x = ToDouble(wejscie[0]);
int y = Int32.Parse(wejscie[1]);
Console.WriteLine(x);
Console.WriteLine(y);
//Console.WriteLine(wejscie[1]);
//int x = sr.Read
Console.WriteLine(Dwumian.Oblicz(x, y));
Console.ReadKey();
}
}
class Silnia
{
public static int Oblicz(int x)
{
int n = x;
for(int i=1; i<n; ++i)
{
x *= n - i;
}
return x;
}
}
class Dwumian
{
public static int Oblicz(int x, int y)
{
return Silnia.Oblicz(x) / (Silnia.Oblicz(x - y) * Silnia.Oblicz(y));
}
}
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