public ulong FindNumberThatIsNotSumOfKPreviousNumbers(IPuzzleSolverDay1 helpingSolver, List <ulong> numbers, int k)
{
var summmingNumbers = numbers.Take(k).ToList();
foreach (var number in numbers.Skip(k))
{
var result = helpingSolver.GetNumbersThatSumToN(summmingNumbers, number);
if (result.Count == 0)
{
return(number);
}
summmingNumbers.RemoveAt(0);
summmingNumbers.Add(number);
}
throw new Exception("All numbers are good.");
}
