229 lines
6.6 KiB
Plaintext
229 lines
6.6 KiB
Plaintext
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<Query Kind="Program" />
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class Rail
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{
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public int X,Y;
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public Rail N,E,S,W;
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}
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class Cart
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{
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public Dir D;
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public Rail R;
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public int Mem=0;
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}
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enum Dir {N=0,E=1,S=2,W=3}
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void Main()
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{
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(List<Rail> rails, List<Cart> carts) = Parse(File.ReadAllLines(Path.Combine(Path.GetDirectoryName(Util.CurrentQueryPath), @"13_input.txt")));
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for (int gen=0;;gen++)
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{
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foreach (var c in carts.OrderBy(c => c.R.Y*10000+c.R.X))
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{
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switch (c.D)
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{
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case Dir.S:
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Move(c, new[] { (Dir.E, c.R.E), (Dir.S, c.R.S), (Dir.W, c.R.W) });
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break;
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case Dir.W:
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Move(c, new[] { (Dir.S, c.R.S), (Dir.W, c.R.W), (Dir.N, c.R.N) });
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break;
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case Dir.N:
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Move(c, new[] { (Dir.W, c.R.W), (Dir.N, c.R.N), (Dir.E, c.R.E) });
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break;
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case Dir.E:
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Move(c, new[] { (Dir.N, c.R.N), (Dir.E, c.R.E), (Dir.S, c.R.S) });
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break;
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}
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if (carts.Any(oc => oc != c && oc.R == c.R)) { $"{c.R.X},{c.R.Y} after {gen}".Dump(); return; }
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}
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//foreach (var c in carts) $"{c.R.X}|{c.R.Y}|{c.D}".Dump();"------".Dump();
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}
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}
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void Move(Cart c, IEnumerable<(Dir, Rail)> options)
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{
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var outs = options.Where(p => p.Item2 != null).ToList();
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if (outs.Count == 1)
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{
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c.R = outs[0].Item2;
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c.D = outs[0].Item1;
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}
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else
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{
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c.R = outs[c.Mem % 3].Item2;
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c.D = outs[c.Mem % 3].Item1;
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c.Mem++;
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}
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}
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void Dump(List<Rail> rails, List<Cart> carts)
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{
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int maxx = rails.Max(r => r.X) + 1;
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int maxy = rails.Max(r => r.Y) + 1;
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var b = new StringBuilder();
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for (int yy = 0; yy < maxy; yy++)
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{
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for (int xx = 0; xx < maxx; xx++)
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{
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var cc = carts.FirstOrDefault(c => c.R.X == xx && c.R.Y == yy);
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if (cc != null)
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{
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if (cc.D == Dir.N) b.Append('^');
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if (cc.D == Dir.E) b.Append('>');
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if (cc.D == Dir.S) b.Append('v');
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if (cc.D == Dir.W) b.Append('<');
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}
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else if (rails.Any(r => r.X == xx && r.Y == yy))
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{
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b.Append('.');
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}
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else
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{
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b.Append(' ');
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}
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}
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b.AppendLine();
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}
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b.ToString().Dump();
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"".Dump();
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}
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(List<Rail>, List<Cart>) Parse(string[] line)
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{
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var rails = new Dictionary<(int,int), Rail>();
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var carts = new List<Cart>();
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Rail get(int x, int y) { if(rails.TryGetValue((x,y), out var v))return v; Rail r = new Rail { X = x, Y = y }; rails.Add((x,y),r); return r; }
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char last = ' ';
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for (int y = 0; y < line.Length; y++)
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{
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last = ' ';
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for (int x = 0; x < line[y].Length; x++)
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{
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char c = line[y][x];
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if (c==' ') continue;
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switch (c)
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{
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case '-':
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{
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var rr = get(x, y);
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var ra = get(x - 1, y);
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var rb = get(x + 1, y);
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rr.W = ra; ra.E = rr;
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rr.E = rb; rb.W = rr;
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}
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break;
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case '|':
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{
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var rr = get(x, y);
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var ra = get(x, y - 1);
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var rb = get(x, y + 1);
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rr.N = ra; ra.S = rr;
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rr.S = rb; rb.N = rr;
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}
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break;
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case '+':
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{
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var rr = get(x, y);
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var ra = get(x, y - 1);
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var rb = get(x + 1, y);
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var rc = get(x, y + 1);
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var rd = get(x - 1, y);
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rr.N = ra; ra.S = rr;
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rr.E = rb; rb.W = rr;
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rr.S = rc; rc.N = rr;
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rr.W = rd; rd.E = rr;
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}
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break;
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case '/':
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if (last == '-' || last == '+')
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{
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var rr = get(x, y);
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var ra = get(x - 1, y);
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var rb = get(x, y - 1);
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rr.W = ra; ra.E = rr;
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rr.N = rb; rb.S = rr;
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}
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else
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{
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var rr = get(x, y);
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var ra = get(x + 1, y);
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var rb = get(x, y + 1);
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rr.E = ra; ra.W = rr;
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rr.S = rb; rb.N = rr;
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}
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break;
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case '\\':
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if (last == '-' || last == '+')
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{
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var rr = get(x, y);
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var ra = get(x - 1, y);
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var rb = get(x, y + 1);
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rr.W = ra; ra.E = rr;
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rr.S = rb; rb.N = rr;
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}
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else
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{
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var rr = get(x, y);
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var ra = get(x + 1, y);
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var rb = get(x, y - 1);
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rr.E = ra; ra.W = rr;
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rr.N = rb; rb.S = rr;
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}
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break;
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case '^':
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{
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var rr = get(x, y);
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var ra = get(x, y - 1);
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var rb = get(x, y + 1);
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rr.N = ra; ra.S = rr;
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rr.S = rb; rb.N = rr;
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carts.Add(new Cart { D = Dir.N, R=rr, });
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}
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break;
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case 'v':
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{
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var rr = get(x, y);
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var ra = get(x, y - 1);
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var rb = get(x, y + 1);
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rr.N = ra; ra.S = rr;
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rr.S = rb; rb.N = rr;
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carts.Add(new Cart { D = Dir.S, R=rr, });
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}
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break;
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case '>':
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{
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var rr = get(x, y);
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var ra = get(x - 1, y);
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var rb = get(x + 1, y);
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rr.W = ra; ra.E = rr;
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rr.E = rb; rb.W = rr;
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carts.Add(new Cart { D = Dir.E, R = rr, });
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}
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break;
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case '<':
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{
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var rr = get(x, y);
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var ra = get(x - 1, y);
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var rb = get(x + 1, y);
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rr.W = ra; ra.E = rr;
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rr.E = rb; rb.W = rr;
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carts.Add(new Cart { D = Dir.W, R = rr, });
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}
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break;
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}
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last = c;
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}
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}
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return (rails.Select(p=>p.Value).ToList(), carts);
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}
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