/// <summary>
/// https://adventofcode.com/2020/day/16
/// </summary>
public static void Part1()
{
var notes = TicketNotes.Parse(Input.Get(16));
var values = notes.FindImpossibleValues();
Console.WriteLine(values.Sum());
}
/// <summary>
/// https://adventofcode.com/2020/day/16#part2
/// </summary>
public static void Part2()
{
var notes = TicketNotes.Parse(Input.Get(16));
var order = notes.GetFieldOrder();
var depatureIndexes = order.Select((x, i) => (Value: x, Index: i))
.Where(x => x.Value.StartsWith("departure"))
.Select(x => x.Index);
var departureFields = depatureIndexes.Select(i => notes.YourTicket.ElementAt(i));
var product = departureFields.Aggregate(BigInteger.One, (x, y) => x * y);
Console.WriteLine(product);
}
