Preparations for AdventOfCode section

www/statics/aoc/2018/07-2.linq

@@ -0,0 +1,61 @@
+<Query Kind="Program" />
+
+class Node { public char N; public List<Node> Precond = new List<Node>(); public List<Node> Postcond = new List<Node>(); }
+class Worker { public Node curr; public int Remaining; }
+void Main()
+{
+	var data = File
+		.ReadAllLines(Path.Combine(Path.GetDirectoryName(Util.CurrentQueryPath), @"07_input.txt"))
+		.Where(p => !string.IsNullOrWhiteSpace(p))
+		.Select(l => (l[5], l[36]))
+		.ToList();
+
+	var nodes = data.SelectMany(p => new[] { p.Item1, p.Item2 }).Distinct().Select(p => new Node { N = p }).ToList();
+
+	foreach (var (pre, post) in data)
+	{
+		var n1 = nodes.First(p => p.N == pre);
+		var n2 = nodes.First(p => p.N == post);
+
+		n1.Postcond.Add(n2);
+		n2.Precond.Add(n1);
+	}
+
+	var workers = Enumerable.Repeat(0, 5).Select(p => new Worker()).ToList();
+
+	var started = new HashSet<Node>();
+	var fin = new HashSet<Node>();
+	var done = new StringBuilder();
+	for (int sec = 0; workers.Any(n => n.curr != null) || fin.Count < nodes.Count; sec++)
+	{
+		foreach (var w in workers.Where(p => p.curr != null))
+		{
+			if (--w.Remaining == 0)
+			{
+				started.Remove(w.curr);
+				done.Append(w.curr.N);
+				fin.Add(w.curr);
+				w.curr = null;
+			}
+		}
+
+		foreach (var w in workers.Where(p => p.curr == null))
+		{
+			var n = nodes
+				.Where(p => !started.Contains(p))
+				.Where(p => !fin.Contains(p))
+				.Where(p => p.Precond.All(q => fin.Contains(q)))
+				.OrderBy(p => p.N)
+				.FirstOrDefault();
+			if (n == null) continue;
+			w.curr = n;
+			w.Remaining = 60 + 1 + (n.N - 'A');
+			started.Add(n);
+		}
+
+		$"{sec:000}    {string.Join(" ", workers.Select(w => (w?.curr?.N ?? '.').ToString()))}   {done.ToString()}".Dump();
+	}
+
+}
+
+// Define other methods and classes here