protected override String DoSolve(String[] input)
{
int instructionCount = 0;
int housePresentCount = 0;
Point santasLocation = new Point(0, 0);
Point roboSantasLocation = new Point(0, 0);
IHouse startingHouse = Factory.CreateHouse(santasLocation);
startingHouse.DeliverPresent(); //from Santa
startingHouse.DeliverPresent(); //from Robo-Santa
_visitedHouses.Add(startingHouse);
foreach (String line in input)
{
foreach (char instruction in line)
{
switch (instruction)
{
case '^':
ProcessInstruction(ref santasLocation, ref roboSantasLocation, instructionCount, 0, 1);
break;
case 'v':
ProcessInstruction(ref santasLocation, ref roboSantasLocation, instructionCount, 0, -1);
break;
case '>':
ProcessInstruction(ref santasLocation, ref roboSantasLocation, instructionCount, 1, 0);
break;
case '<':
ProcessInstruction(ref santasLocation, ref roboSantasLocation, instructionCount, -1, 0);
break;
}
instructionCount++;
}
}
housePresentCount = _visitedHouses.Count;
return($"{ housePresentCount } houses received at least one present.");
}
private void AddHouseIfNew(Point point)
{
IHouse house = Factory.CreateHouse(point);
if (_visitedHouses.Contains(house))
{
house.DeliverPresent();
}
else
{
_visitedHouses.Add(house);
}
}