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22-1.linq
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22-1.linq
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<Query Kind="Program" />
void Main()
{
Directory.SetCurrentDirectory(Path.GetDirectoryName(Util.CurrentQueryPath));
string[] inputLines = System.IO.File.ReadAllLines("22.txt");
int totalCards = 10007;
int[] cards = Enumerable.Range(0, totalCards).ToArray();
foreach (var line in inputLines)
{
if (line.StartsWith("deal into"))
{
cards = DealInto(cards);
}
else if (line.StartsWith("cut"))
{
cards = Cut(cards, int.Parse(line.Split(' ').Last()));
}
else
{
cards = DealWith(cards, int.Parse(line.Split(' ').Last()));
}
}
cards.ToList().IndexOf(2019).Dump();
int[] DealInto(int[] deck)
{
return deck.Reverse().ToArray();
}
int[] Cut(int[] deck, int n)
{
if (n > 0)
return deck[n..].Concat(deck[0..n]).ToArray();
else
{
n = Math.Abs(n);
return deck[^n..].Concat(deck[0..^n]).ToArray();
}
}
int[] DealWith(int[] oldDeck, int n)
{
int[] newDeck = Enumerable.Range(0, oldDeck.Length).Select(i => -1).ToArray();
int counter = 0;
for (int i = 0; i < oldDeck.Length; i++)
{
newDeck[counter] = oldDeck[i];
counter += n;
if (counter >= oldDeck.Length)
{
counter = counter - oldDeck.Length;
}
}
return newDeck;
}
}