// theoretisch gezien werkt het....
public static long Part2Solution(JupiterMoonSystem jupiterMoonSystem, JupiterMoonSystem initialSystem)
{
long steps = 0;
var historyDoesntRepeat = true;
var moonEqualityComparer = new MoonEqualityComparer();
var velocityEqualityComparer = new VelocityEqualityComparer();
while (historyDoesntRepeat)
{
steps++;
foreach (var moon in jupiterMoonSystem.GetMoons())
{
var otherMoons = jupiterMoonSystem.Moons.Where(m => m != moon); //hier kun je ook excepten als sneller;
foreach (var otherMoon in otherMoons)
{
moon.V.vX += (otherMoon.X - moon.X) == 0 ? (otherMoon.X - moon.X) : (otherMoon.X - moon.X) / Math.Abs(otherMoon.X - moon.X);
moon.V.vY += (otherMoon.Y - moon.Y) == 0 ? (otherMoon.Y - moon.Y) : (otherMoon.Y - moon.Y) / Math.Abs(otherMoon.Y - moon.Y);
moon.V.vZ += (otherMoon.Z - moon.Z) == 0 ? (otherMoon.Z - moon.Z) : (otherMoon.Z - moon.Z) / Math.Abs(otherMoon.Z - moon.Z);
}
}
foreach (var moon in jupiterMoonSystem.GetMoons())
{
moon.Tick();
}
if (!initialSystem.Moons.Except(jupiterMoonSystem.Moons, moonEqualityComparer).Any() &&
!initialSystem.MoonVelocities.Except(jupiterMoonSystem.MoonVelocities, velocityEqualityComparer).Any())
{
historyDoesntRepeat = false;
}
}
return(steps);
}
static void Main(string[] args)
{
// Part 1
var jupiterMoonSystem = new JupiterMoonSystem();
jupiterMoonSystem.AddMoon(new Moon(1, 4, 4));
jupiterMoonSystem.AddMoon(new Moon(-4, -1, 19));
jupiterMoonSystem.AddMoon(new Moon(-15, -14, 12));
jupiterMoonSystem.AddMoon(new Moon(-17, 1, 10));
var solution = Part1Solution(jupiterMoonSystem, 1000);
System.Console.WriteLine(solution);
// Part 2
jupiterMoonSystem = new JupiterMoonSystem();
jupiterMoonSystem.AddMoon(new Moon(1, 4, 4));
jupiterMoonSystem.AddMoon(new Moon(-4, -1, 19));
jupiterMoonSystem.AddMoon(new Moon(-15, -14, 12));
jupiterMoonSystem.AddMoon(new Moon(-17, 1, 10));
var jupiterMoonSystemInitial = new JupiterMoonSystem();
jupiterMoonSystemInitial.AddMoon(new Moon(1, 4, 4));
jupiterMoonSystemInitial.AddMoon(new Moon(-4, -1, 19));
jupiterMoonSystemInitial.AddMoon(new Moon(-15, -14, 12));
jupiterMoonSystemInitial.AddMoon(new Moon(-17, 1, 10));
var solution2 = Part2Solution(jupiterMoonSystem, jupiterMoonSystemInitial);
System.Console.WriteLine(solution2);
}
public static int Part1Solution(JupiterMoonSystem jupiterMoonSystem, int steps)
{
for (int t = 0; t < steps; t++)
{
foreach (var moon in jupiterMoonSystem.GetMoons())
{
var otherMoons = jupiterMoonSystem.Moons.Where(m => m != moon);
foreach (var otherMoon in otherMoons)
{
moon.V.vX += (otherMoon.X - moon.X) == 0 ? (otherMoon.X - moon.X) : (otherMoon.X - moon.X) / Math.Abs(otherMoon.X - moon.X);
moon.V.vY += (otherMoon.Y - moon.Y) == 0 ? (otherMoon.Y - moon.Y) : (otherMoon.Y - moon.Y) / Math.Abs(otherMoon.Y - moon.Y);
moon.V.vZ += (otherMoon.Z - moon.Z) == 0 ? (otherMoon.Z - moon.Z) : (otherMoon.Z - moon.Z) / Math.Abs(otherMoon.Z - moon.Z);
}
}
foreach (var moon in jupiterMoonSystem.GetMoons())
{
moon.Tick();
}
}
return(jupiterMoonSystem.getTotalEnergy());
}