private static int GcdCore(CalcGcdDelegat calc, params int[] param)
{
if (param.Length < 2)
{
throw new ArgumentException();
}
if (param.Length == 2)
{
return(calc.Invoke(param[0], param[1]));
}
int[] newParam = new int[param.Length / 2 + 1];
if (param.Length % 2 != 0)
{
newParam[param.Length / 2] = param[param.Length - 1];
}
for (int i = 0; i < newParam.Length - 1; i++)
{
newParam[i] = calc.Invoke(param[2 * i], param[2 * i + 1]);
}
return(GcdCore(calc, newParam));
}
private static int GcdCore(CalcGcdDelegat calc, int firstNumber, int secondNumber, int thirdNumber) => calc.Invoke(calc.Invoke(firstNumber, secondNumber), thirdNumber);