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www.mikescher.com/www/statics/aoc/2018/07-1.linq

36 lines
958 B
C#

<Query Kind="Program" />
class Node { public char N; public List<Node> Precond = new List<Node>(); public List<Node> Postcond = new List<Node>(); }
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 r = new StringBuilder();
for(var fin = new HashSet<Node>(); fin.Count<nodes.Count;)
{
var n = nodes.Where(p => !fin.Contains(p)).Where(p => p.Precond.All(q => fin.Contains(q))).OrderBy(p=>p.N).First();
fin.Add(n);
r.Append(n.N);
}
r.ToString().Dump();
}
// Define other methods and classes here