1 files changed, 0 insertions, 127 deletions
diff --git a/Day12.cs b/Day12.cs
deleted file mode 100644
index 312c705..0000000
--- a/Day12.cs
+++ /dev/null
@@ -1,127 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace aoc2019
-{
-    internal sealed class Day12 : Day
-    {
-        private readonly List<Position> moons;
-        private int step;
-
-        public Day12() : base(12, "The N-Body Problem")
-        {
-            moons = Input
-                .Select(moon =>
-                    moon
-                        .TrimStart('<')
-                        .TrimEnd('>')
-                        .Split(",")
-                        .Select(val => int.Parse(val.Split("=").Last()))
-                )
-                .Select(moon => new Position(moon.ToList()))
-                .ToList();
-
-            foreach (var moon in moons)
-                moon.SetSiblings(moons);
-        }
-
-        public static long LCM(long a, long b)
-        {
-            return a * b / GCD(a, b);
-        }
-
-        public static long GCD(long a, long b)
-        {
-            if (b == 0) return a;
-            return GCD(b, a % b);
-        }
-
-        private void Step()
-        {
-            foreach (var moon in moons)
-                moon.Gravitate();
-
-            foreach (var moon in moons)
-                moon.Move();
-
-            step++;
-        }
-
-        protected override string Part1()
-        {
-            while (step < 1000)
-                Step();
-
-            return $"{moons.Sum(p => p.TotalEnergy)}";
-        }
-
-        protected override string Part2()
-        {
-            int cycleX = 0, cycleY = 0, cycleZ = 0;
-
-            while (cycleX == 0 || cycleY == 0 || cycleZ == 0)
-            {
-                Step();
-                if (cycleX == 0 && moons.All(m => m.dx == 0)) cycleX = step * 2;
-                if (cycleY == 0 && moons.All(m => m.dy == 0)) cycleY = step * 2;
-                if (cycleZ == 0 && moons.All(m => m.dz == 0)) cycleZ = step * 2;
-            }
-
-            return $"{LCM(cycleX, LCM(cycleY, cycleZ))}";
-        }
-
-        public class Position
-        {
-            public int dx, dy, dz;
-            private List<Position> siblings;
-            public int x, y, z;
-
-            public Position(IList<int> moon)
-            {
-                x = moon[0];
-                y = moon[1];
-                z = moon[2];
-                dx = 0;
-                dy = 0;
-                dz = 0;
-            }
-
-            internal int KineticEnergy =>
-                Math.Abs(x) + Math.Abs(y) + Math.Abs(z);
-
-            internal int PotentialEnergy =>
-                Math.Abs(dx) + Math.Abs(dy) + Math.Abs(dz);
-
-            internal int TotalEnergy =>
-                KineticEnergy * PotentialEnergy;
-
-            public void SetSiblings(List<Position> positions)
-            {
-                siblings = positions.Where(p => p != this).ToList();
-            }
-
-            public override string ToString()
-            {
-                return $"pos=<x={x}, y={y}, z={z}> vel=<x={dx}, y={dy}, z={dz}>";
-            }
-
-            internal void Gravitate()
-            {
-                foreach (var m in siblings)
-                {
-                    if (x != m.x) dx += x > m.x ? -1 : 1;
-                    if (y != m.y) dy += y > m.y ? -1 : 1;
-                    if (z != m.z) dz += z > m.z ? -1 : 1;
-                }
-            }
-
-            internal void Move()
-            {
-                x += dx;
-                y += dy;
-                z += dz;
-            }
-        }
-    }
-}
\ No newline at end of file