private string Part2(IEnumerable <KeyValuePair <char, int> > input)
{
var position = new Vector2Int(0, 0);
var waypoint = new Vector2Int(10, 1);
foreach (var(key, value) in input)
{
switch (key)
{
case 'F':
position += waypoint * value;
break;
case 'L':
waypoint = waypoint.RotateBy(value);
break;
case 'R':
waypoint = waypoint.RotateBy(-value);
break;
default:
{
var direction = Enum.Parse <Direction>(key.ToString(), true);
waypoint += direction.GetStep() * value;
break;
}
}
}
position = position.Abs();
var answer = position.x + position.y;
return(answer.ToString());
}
public static int DistMHTo(this Vector2Int from, Vector2Int to)
{
Vector2Int v2 = from - to;
v2 = v2.Abs();
return(v2.x + v2.y);
}
public int GetRank(Vector2Int coordinate)
{
// Get the distance from the front rank
Vector2Int frontOrigin = GetFrontOrigin();
Vector2Int delta = frontOrigin - coordinate;
// Delete information in the axis we don't care about
delta *= facing.Abs();
// Remaining axis contains rank
return(delta.Abs().MaxAxisMagnitude());
}
public static void ForEach(this Vector2Int thisVector, Action <Vector2Int> thisAction)
{
Vector2Int absVector = thisVector.Abs();
Vector2Int direction = new Vector2Int(
thisVector.x.Normalized(),
thisVector.y.Normalized()
);
for (int x = 0; x <= absVector.x; x++)
{
for (int y = 0; y <= absVector.y; y++)
{
thisAction(Vector2Int.Scale(new Vector2Int(x, y), direction));
}
}
}
