namespace Day9;

public record Sequence(long[] Numbers)
{
    public bool IsZeros() => Numbers.All(n => n == 0);

    public Sequence Difference()
    {
        var diff = new long[Numbers.Length - 1];
        for (var i = 0; i < Numbers.Length - 1; i++)
        {
            diff[i] = Numbers[i + 1] - Numbers[i];
        }

        return new Sequence(diff);
    }

    public long Next(long delta)
    {
        return Numbers.Last() + delta;
    }
    
    public long Prev(long delta)
    {
        return Numbers.First() - delta;
    }
}