public void Combination()
{
var factor = new StaticModIntFactor <Mod1000000007>(10);
for (int i = 0; i <= 10; i++)
{
for (int j = 0; j <= 10; j++)
{
factor.Combination(i, j).Value.Should().Be((int)MathLibEx.Combination(i, j));
}
}
factor.Invoking(factor => factor.Combination(11, 0)).Should().Throw <Exception>();
}
public void Combination()
{
for (int i = 0; i <= 10; i++)
{
for (int j = 0; j <= i; j++)
{
long n = 1, d = 1;
for (int k = 0; k < j; k++)
{
n *= i - k;
d *= k + 1;
}
MathLibEx.Combination(i, j).Should().Be(n / d);
}
}
}