static void Main(string[] args)
{
var state = new PlaneState(
File.ReadAllLines("input.txt")
.Select(line => line
.Select(c => StateHelper.Parse(c))));
var stableState = Enumerable.GenerateWithPrevious(state, Next).SkipWhile(el => el.Previous != el.Current)
.First().Current;
Console.WriteLine(stableState.Chairs.Count(ch => ch.State == ChairState.Occupied));
var stableStateTwo = Enumerable.GenerateWithPrevious(state, NextPartTwo).SkipWhile(el => el.Previous != el.Current)
.First().Current;
Console.WriteLine(stableStateTwo.Chairs.Count(ch => ch.State == ChairState.Occupied));
}
