protected override long Part2(string[] input)
{
var moons = input
.Select(x => Moon.ParseFrom(x))
.ToArray();
var planet = new Planet(moons);
var xvec = planet.XVectors.ToArray();
var yvec = planet.YVectors.ToArray();
var zvec = planet.ZVectors.ToArray();
var xcycle = 0L;
var ycycle = 0L;
var zcycle = 0L;
while (xcycle == 0 || ycycle == 0 || zcycle == 0)
{
planet.SimulateMotionStep();
if (xcycle == 0 && planet.XVectors.SequenceEqual(xvec))
{
xcycle = planet.SimulationStep;
}
if (ycycle == 0 && planet.YVectors.SequenceEqual(yvec))
{
ycycle = planet.SimulationStep;
}
if (zcycle == 0 && planet.ZVectors.SequenceEqual(zvec))
{
zcycle = planet.SimulationStep;
}
}
var cycle = MathHelper.LeastCommonMultiple(xcycle, ycycle, zcycle);
return(cycle);
}
protected override long Part1(string[] input)
{
var moons = input
.Select(x => Moon.ParseFrom(x))
.ToArray();
var jupiter = new Planet(moons);
for (var i = 0; i < 1000; i++)
{
jupiter.SimulateMotionStep();
}
var totalEnergy = jupiter.TotalEnergy;
return(totalEnergy);
}
public void ApplyGravityFrom(Moon otherMoon)
{
Vx += X == otherMoon.X ? 0 : X < otherMoon.X ? 1 : -1;
Vy += Y == otherMoon.Y ? 0 : Y < otherMoon.Y ? 1 : -1;
Vz += Z == otherMoon.Z ? 0 : Z < otherMoon.Z ? 1 : -1;
}