private static string BruteForceDoor(ScanningDroid droid, IOutput output)
{
var allItems = droid.GetInventory();
var allSubsets = allItems.Subsets();
droid.Drop(allItems);
foreach (var subset in allSubsets)
{
if (subset.Count == 0)
{
continue;
}
droid.Take(subset);
var result = droid.Go(Direction.South);
if (result is not null && result.Contains("you are ejected back to the checkpoint.") is false)
{
output.WriteProperty("Items Used", string.Join(", ", subset));
return(result);
}
droid.Drop(subset);
}
throw new InvalidOperationException("We can't get to the right weight!");
}
public override void PartOne(IInput input, IOutput output)
{
var program = input.Parse();
var droid = new ScanningDroid(program);
droid.SeekToAirlock();
var result = BruteForceDoor(droid, output);
var passcode = Regex.Match(result, "typing ([0-9]*) on the keypad at the main airlock.").Groups[1].Value;
output.WriteProperty("Passcode", passcode);
}
