public void TestSimulate()
{
MotionSimulator ms = new MotionSimulator();
Moon A = new Moon(-1, 0, 2);
Moon B = new Moon(2, -10, -7);
Moon C = new Moon(4, -8, 8);
Moon D = new Moon(3, 5, -1);
List <Moon> moons = new List <Moon>();
moons.Add(A);
moons.Add(B);
moons.Add(C);
moons.Add(D);
ms.Simulate(moons, 10);
Assert.That(A.PosX, Is.EqualTo(2));
Assert.That(A.PosY, Is.EqualTo(1));
Assert.That(A.PosZ, Is.EqualTo(-3));
Assert.That(A.VelX, Is.EqualTo(-3));
Assert.That(A.VelY, Is.EqualTo(-2));
Assert.That(A.VelZ, Is.EqualTo(1));
}
public string SolvePartOne(string[] input, int steps)
{
MotionSimulator ms = new MotionSimulator();
List <Moon> moons = ParseInput(input);
ms.Simulate(moons, steps);
return(ms.SystemEnergy(moons).ToString());
}
public void TestUpdatePosition()
{
MotionSimulator ms = new MotionSimulator();
Moon A = new Moon(0, 0, 0);
A.VelX = 1;
A.VelY = 2;
A.VelZ = 3;
List <Moon> moons = new List <Moon>();
moons.Add(A);
ms.UpdatePosition(moons);
Assert.That(A.VelX, Is.EqualTo(1));
Assert.That(A.VelY, Is.EqualTo(2));
Assert.That(A.VelZ, Is.EqualTo(3));
}
public void TestUpdateVelocity()
{
MotionSimulator ms = new MotionSimulator();
Moon A = new Moon(0, 0, 0);
Moon B = new Moon(1, 1, 1);
List <Moon> moons = new List <Moon>(2);
moons.Add(A);
moons.Add(B);
ms.UpdateVelocity(moons);
Assert.That(A.VelX, Is.EqualTo(1));
Assert.That(A.VelY, Is.EqualTo(1));
Assert.That(A.VelZ, Is.EqualTo(1));
Assert.That(B.VelX, Is.EqualTo(-1));
Assert.That(B.VelY, Is.EqualTo(-1));
Assert.That(B.VelZ, Is.EqualTo(-1));
}
public string SolvePartTwo(string[] input)
{
MotionSimulator ms = new MotionSimulator();
List <Moon> moons = ParseInput(input);
List <Moon> initialState = ParseInput(input);
long timelapseX = 0;
long timelapseY = 0;
long timelapseZ = 0;
long step = 0;
do
{
ms.Step(moons);
step++;
if (IsInitialXState(moons, initialState) && timelapseX == 0)
{
timelapseX = step;
}
if (IsInitialYState(moons, initialState) && timelapseY == 0)
{
timelapseY = step;
}
if (IsInitialZState(moons, initialState) && timelapseZ == 0)
{
timelapseZ = step;
}
} while(timelapseX == 0 || timelapseY == 0 || timelapseZ == 0);
long steps = LCM(timelapseX, LCM(timelapseY, timelapseZ));
return(steps.ToString());
}