public string Part1(string[] input)
{
var moons = ParseMoons(input);
var simulator = new MoonSimulator(moons);
simulator.Simulate(1000);
return(simulator.TotalEnergy.ToString());
}
public string Part2(string[] input)
{
var moons = ParseMoons(input);
var simulator = new MoonSimulator(moons);
var ticks = 0L;
var xCycles = 0L;
var yCycles = 0L;
var zCycles = 0L;
var moonMappings = simulator.MoonsToOriginalMoons;
while (true)
{
ticks++;
simulator.Step();
if (moons.All(m => Moon.XComparer.Equals(m, moonMappings[m]) && xCycles == 0))
{
xCycles = ticks;
}
if (moons.All(m => Moon.YComparer.Equals(m, moonMappings[m]) && yCycles == 0))
{
yCycles = ticks;
}
if (moons.All(m => Moon.ZComparer.Equals(m, moonMappings[m]) && zCycles == 0))
{
zCycles = ticks;
}
if (xCycles * yCycles * zCycles != 0)
{
var result = MathEx.LCM(new long[] { xCycles + 1, yCycles + 1, zCycles + 1 });
return(result.ToString());
}
}
}