private static void Part2(DirectedGraph graph)
{
var workGroup = new WorkGroup(5);
var completedSteps = new List <Node>();
var availableSteps = new List <Node>(graph.Roots);
availableSteps.Sort();
// Initialise
foreach (Worker worker in workGroup.Workers)
{
if (availableSteps.Any())
{
worker.AssignStep(availableSteps.First());
availableSteps.RemoveAt(0);
}
}
// Tick
var totalTime = 0;
while (completedSteps.Count < graph.Nodes.Count)
{
var workResult = workGroup.DoWork();
if (workResult.Any())
{
completedSteps.AddRange(workResult);
// Get newly available steps
foreach (var stepsReadyToComplete in completedSteps.Select(completedStep =>
graph.GetStepsReadyToComplete(completedStep.Name,
string.Join(string.Empty, completedSteps.Select(c => c.Name)))))
{
availableSteps.AddRange(stepsReadyToComplete.Select(s => new Node(s)));
}
availableSteps = availableSteps.DistinctBy(s => s.Name).ToList();
availableSteps.Sort();
// Need to account for "in progress" steps.
foreach (int index in workGroup.BusyWorkers
.Select(worker => availableSteps.FindIndex(s => s.Name == worker.WorkingOn.Name))
.Where(index => index >= 0))
{
availableSteps.RemoveAt(index);
}
}
foreach (Worker worker in workGroup.AvailableWorkers.Where(worker => availableSteps.Any()))
{
worker.AssignStep(availableSteps.First());
availableSteps.RemoveAt(0);
}
totalTime++;
}
// Correct answer: 973
Console.WriteLine($"Total time: {totalTime}s");
}
private static void Part1(DirectedGraph graph)
{
// Correct answer: BCADPVTJFZNRWXHEKSQLUYGMIO
Console.WriteLine($"Step Order: {graph.GetStepOrder()}");
}