public override object GetAnswerTwo()
{
BagRule[] rules = GetRules().ToArray();
BagRule br = rules.Single(it => it.Name == "shiny gold");
return(br.CountInside(rules));
}
public static void Day7()
{
Console.WriteLine("Day7: ");
Dictionary <string, BagRule> rules = File.ReadAllLines("Aoc2020\\Day07\\input.txt").Select(rule => new BagRule(rule)).ToDictionary(rule => rule.Color);
// part 1
bool CanContain(string outercolor, string color)
{
BagRule outerBag = rules[outercolor];
if (outerBag.ContentRules.ContainsKey(color))
{
return(true);
}
foreach (var innerBag in outerBag.ContentRules)
{
if (CanContain(innerBag.Key, color))
{
return(true);
}
}
return(false);
}
int count = 0;
foreach (var bag in rules.Keys)
{
if (CanContain(bag, "shiny gold"))
{
count++;
}
}
Console.WriteLine(count);
// part 2
int CountContents(string color)
{
BagRule bag = rules[color];
int count = 0;
foreach (var innerBag in bag.ContentRules)
{
count += innerBag.Value * CountContents(innerBag.Key) + innerBag.Value;
}
return(count);
}
Console.WriteLine(CountContents("shiny gold"));
}