public override void PartTwo()
{
var half = InputLine.Length / 2;
var captcha = new CircularBuffer <int>(InputLine.Digits().ToArray());
var result = captcha.Select((d, i) => d == captcha[i + half] ? d : 0).Sum();
WriteLn(result);
}
public override void PartOne()
{
var result = InputLine.Digits().Again(1).Pairwise((a, b) => a == b ? a : 0).Sum();
WriteLn(result);
}