public long CalculatePartTwo()
{
var arrangements = new Dictionary <long, long> {
{ Jolts.Max() + 3, 1 }
};
foreach (var jolt in new[] { 0 }.Concat(Jolts).Reverse())
{
arrangements.Add(jolt, Options
.Where(option => arrangements.ContainsKey(jolt + option))
.Sum(option => arrangements[jolt + option])
);
}
return(arrangements.Last().Value);
}
public int CalculatePartOne()
{
var joltAmount = 0;
while (joltAmount < Jolts.Max())
{
if (Jolts.Contains(joltAmount + 1))
{
joltAmount++;
OneJoltDifference++;
continue;
}
if (Jolts.Contains(joltAmount + 3))
{
joltAmount += 3;
ThreeJoltDifference++;
}
}
return(OneJoltDifference * ThreeJoltDifference);
}