/// <summary>
/// https://adventofcode.com/2020/day/21#part2
/// </summary>
public static void Part2()
{
var notes = IngredientsListSet.Parse(Input.Get(21));
var allergens = notes.FindAllergens();
var canonicalDangerousIngredientList = string.Join(',', allergens.OrderBy(x => x.Key).Select(x => x.Value));
Console.WriteLine(canonicalDangerousIngredientList);
}
/// <summary>
/// https://adventofcode.com/2020/day/21
/// </summary>
public static void Part1()
{
var notes = IngredientsListSet.Parse(Input.Get(21));
var names = notes.Value.SelectMany(x => x.Ingredients);
var allergens = notes.FindAllergens().Values;
var nonAllergens = names.Except(allergens).ToList();
var counts = nonAllergens.Select(x => notes.Value.Count(y => y.Ingredients.Contains(x)));
Console.WriteLine(counts.Sum());
}