static void Main(string[] args)
{
const int numPlayers = 477;
const int lastMarble = 70851 * 100;
var scores = new UInt64[numPlayers];
var board = new LinkedList <UInt64>();
var currentMarble = board.AddFirst(0);
for (uint marble = 1, currentPlayer = 0; marble <= lastMarble; marble++, currentPlayer = (currentPlayer + 1) % numPlayers)
{
if (marble % 23 == 0)
{
var nodeToRemove = GetNodeToRemove();
currentMarble = nodeToRemove.Next ?? board.First;
board.Remove(nodeToRemove);
scores[currentPlayer] += marble + nodeToRemove.Value;
LinkedListNode <UInt64> GetNodeToRemove()
{
var node = currentMarble;
for (int i = 0; i < 7; i++)
{
node = node.Previous ?? board.Last;
}
return(node);
}
}
else
{
var addAfter = currentMarble.Next ?? board.First;
currentMarble = board.AddAfter(addAfter, marble);
}
}
var highScore = scores.Max();
Console.WriteLine($"Winning score: {highScore}");
Console.ReadKey();
}