public static void Execute()
{
RobotCoord startPoint = new RobotCoord {
X = 0, Y = 0, Current = true
};
coordsVisited.Add(startPoint);
long executionPointer = 0;
long colour = 0;
long direction = 0;
int currentDirection = Direction.Up;
while (input[executionPointer] != OpcodeActions.End)
{
RobotCoord currentCoord = coordsVisited.First(x => x.Current);
_globalInput = currentCoord.Colour == 0 ? 0 : 1;
colour = ParseOpcode(input, ref executionPointer);
if (colour == -1)
{
break;
}
if ((int)colour != currentCoord.Colour)
{
currentCoord.Colour = (int)colour;
currentCoord.ColourChanged = true;
}
executionPointer += 2;
direction = ParseOpcode(input, ref executionPointer);
CalculateDirection(direction, ref currentDirection, currentCoord);
executionPointer += 2;
}
Console.WriteLine($"Number of painted squares: {coordsVisited.Count(x => x.ColourChanged)}");
}
private static void WalkForwardOne(int currentDirection, RobotCoord currentCoord)
{
coordsVisited.ForEach(x => x.Current = false);
RobotCoord newCoord = new RobotCoord();
switch (currentDirection)
{
case 1:
newCoord = new RobotCoord
{
X = currentCoord.X,
Y = currentCoord.Y + 1,
Current = true
};
if (coordsVisited.Any(x => x.X == newCoord.X && x.Y == newCoord.Y))
{
var coord = coordsVisited.First(x => x.X == newCoord.X && x.Y == newCoord.Y);
coord.Current = true;
}
else
{
coordsVisited.Add(newCoord);
}
break;
case 2:
newCoord = new RobotCoord
{
X = currentCoord.X + 1,
Y = currentCoord.Y,
Current = true
};
if (coordsVisited.Any(x => x.X == newCoord.X && x.Y == newCoord.Y))
{
var coord = coordsVisited.First(x => x.X == newCoord.X && x.Y == newCoord.Y);
coord.Current = true;
}
else
{
coordsVisited.Add(newCoord);
}
break;
case 3:
newCoord = new RobotCoord
{
X = currentCoord.X,
Y = currentCoord.Y - 1,
Current = true
};
if (coordsVisited.Any(x => x.X == newCoord.X && x.Y == newCoord.Y))
{
var coord = coordsVisited.First(x => x.X == newCoord.X && x.Y == newCoord.Y);
coord.Current = true;
}
else
{
coordsVisited.Add(newCoord);
}
break;
case 4:
newCoord = new RobotCoord
{
X = currentCoord.X - 1,
Y = currentCoord.Y,
Current = true
};
if (coordsVisited.Any(x => x.X == newCoord.X && x.Y == newCoord.Y))
{
var coord = coordsVisited.First(x => x.X == newCoord.X && x.Y == newCoord.Y);
coord.Current = true;
}
else
{
coordsVisited.Add(newCoord);
}
break;
}
}
private static void CalculateDirection(long direction, ref int currentDirection, RobotCoord currentCoord)
{
switch (direction)
{
case 0:
if (currentDirection == Direction.Up)
{
currentDirection = Direction.Left;
}
else
{
currentDirection -= 1;
}
WalkForwardOne(currentDirection, currentCoord);
break;
case 1:
if (currentDirection == Direction.Left)
{
currentDirection = Direction.Up;
}
else
{
currentDirection += 1;
}
WalkForwardOne(currentDirection, currentCoord);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
public static void Execute()
{
RobotCoord startPoint = new RobotCoord {
X = 0, Y = 0, Current = true, Colour = 1
};
coordsVisited.Add(startPoint);
long executionPointer = 0;
long colour = 0;
long direction = 0;
int currentDirection = Direction.Up;
while (input[executionPointer] != OpcodeActions.End)
{
RobotCoord currentCoord = coordsVisited.First(x => x.Current);
_globalInput = currentCoord.Colour == 0 ? 0 : 1;
colour = ParseOpcode(input, ref executionPointer);
if (colour == -1)
{
break;
}
if ((int)colour != currentCoord.Colour)
{
currentCoord.Colour = (int)colour;
currentCoord.ColourChanged = true;
}
executionPointer += 2;
direction = ParseOpcode(input, ref executionPointer);
CalculateDirection(direction, ref currentDirection, currentCoord);
executionPointer += 2;
}
var minX = coordsVisited.Min(x => x.X);
var maxX = coordsVisited.Max(x => x.X);
var visitedYs = coordsVisited.Select(x => x.Y).Distinct().OrderBy(x => x).ToList();
foreach (var y in visitedYs.OrderByDescending(x => x))
{
var coordsAtY = coordsVisited.Where(x => x.Y == y).OrderBy(x => x.X).ToList();
for (int x = minX; x <= maxX; x++)
{
if (coordsAtY.Any(c => c.X == x))
{
if (coordsAtY.First(c => c.X == x).Colour == 1)
{
Console.Write("#");
}
else
{
Console.Write(" ");
}
}
else
{
Console.Write(" ");
}
}
Console.WriteLine();
}
}
