private static string SolveSilver(string input)
{
var walker = new CityWalker(input);
var location = walker.GetLocations().Last();
var distance = Math.Abs(location.X) + Math.Abs(location.Y);
return($"We think Easter Bunny HQ is at {location.X},{location.Y} for a total distance of {distance}");
}
private static string SolveGold(string input)
{
var walker = new CityWalker(input);
var history = new HashSet <Coordinate>();
Coordinate found = null;
foreach (var location in walker.GetLocations())
{
if (history.Contains(location))
{
found = location;
break;
}
history.Add(location);
}
var distance = found != null?Math.Abs(found.X) + Math.Abs(found.Y) : 0;
return($"Easter Bunny HQ is actually at {found?.X},{found?.Y} for a total distance of {distance}");
}