Advent Of Code

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Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2023

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🍪 - 2023 DAY 7 SOLUTIONS -🍪 (programming.dev)

submitted 11 months ago* (last edited 11 months ago) by Ategon@programming.dev to c/advent_of_code@programming.dev

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Day 7: Camel Cards

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[–] Nighed@sffa.community 2 points 11 months ago

Not too bad - I just scored every hand for the first part so I could easily sort it.

For the second part I just brute forced the replacements for the hand type matchinge (first digit of score)

Task1

public class Day7Task1:IRunnable {

public static Dictionary CardValues = new Dictionary()
 {
     { '2', "01" },
     { '3', "02" },
     { '4', "03" },
     { '5', "04" },
     { '6', "05" },
     { '7', "06" },
     { '8', "07" },
     { '9', "08" },
     { 'T', "09" },
     { 'J', "10" },
     { 'Q', "11" },
     { 'K', "12" },
     { 'A', "13" }
 };
 
 public void Run()
 {
     //var inputLines = File.ReadAllLines("Days/Seven/Day7ExampleInput.txt");
     var inputLines = File.ReadAllLines("Days/Seven/Day7Input.txt");



     var hands = inputLines.Select(line =>
     {
         var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
         return new Hand(split[0],  split[1] );
     }).ToList();

     var sortedHands = hands.OrderBy(hand => hand.Score).ToList();

     long resultValue = 0;

     for (int i = 1; i &lt; hands.Count()+1; i++)
     {
         resultValue += i * sortedHands[i-1].Bid;
     }

     Console.WriteLine("Result:" + resultValue);

 }

 public class Hand
 {
     public Hand(string cards, string bid)
     {
         Cards = cards;
         Bid = int.Parse(bid);
         Score = GenerateScore();
     }

     public string Cards { get; set; }
     public int Bid { get; set; }
     
     public long Score { get; }

     private long GenerateScore()
     {
         var resultString = new StringBuilder();
         var cardGroups = Cards.GroupBy(c => c).ToList();
         var groupCounts = cardGroups.OrderByDescending(g => g.Count()).Select(g => g.Count()).ToList();
         if (cardGroups.Count() == 1)
         {
             resultString.Append("7");
         }
         else if(cardGroups.Count() == 2 &amp;&amp; (cardGroups[0].Count() == 4 || cardGroups[0].Count() == 1))
         {
             resultString.Append("6");
         }
         else if(cardGroups.Count() == 2 &amp;&amp; (cardGroups[0].Count() == 3 || cardGroups[0].Count() == 2))
         {
             resultString.Append("5");
         }
         else if(cardGroups.Count() == 3 &amp;&amp; (cardGroups[0].Count() == 3 || cardGroups[1].Count() == 3 || cardGroups[2].Count() == 3))
         {
             resultString.Append("4");
         }
         else if(cardGroups.Count() == 3 &amp;&amp; groupCounts[0] == 2 &amp;&amp; groupCounts[1] == 2 &amp;&amp; groupCounts[2] == 1)
         {
             resultString.Append("3");
         }
         else if(cardGroups.Count() == 4 )
         {
             resultString.Append("2");
         }
         else
         {
             resultString.Append("1");
         }

         foreach (var card in Cards)
         {
             resultString.Append(Day7Task1.CardValues[card]);
         }

         Console.WriteLine("Cards:{0} Score:{1}",Cards,resultString);
         return long.Parse(resultString.ToString());
     }
 }
}

Task2

public class Day7Task2:IRunnable
{
    public static Dictionary CardValues = new Dictionary()
    {
        { '2', "01" },
        { '3', "02" },
        { '4', "03" },
        { '5', "04" },
        { '6', "05" },
        { '7', "06" },
        { '8', "07" },
        { '9', "08" },
        { 'T', "09" },
        { 'J', "00" },
        { 'Q', "11" },
        { 'K', "12" },
        { 'A', "13" }
    };
    
    public void Run()
    {
        //var inputLines = File.ReadAllLines("Days/Seven/Day7ExampleInput.txt");
        var inputLines = File.ReadAllLines("Days/Seven/Day7Input.txt");



        var hands = inputLines.Select(line =>
        {
            var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
            return new Hand(split[0],  split[1] );
        }).ToList();

        var sortedHands = hands.OrderBy(hand => hand.Score).ToList();

        long resultValue = 0;

        for (int i = 1; i &lt; hands.Count()+1; i++)
        {
            resultValue += i * sortedHands[i-1].Bid;
        }

        Console.WriteLine("Result:" + resultValue);

    }

    public class Hand
    {
        public Hand(string cards, string bid)
        {
            Cards = cards;
            Bid = int.Parse(bid);
            Score = GenerateScore();
        }

        public string Cards { get; set; }
        public int Bid { get; set; }
        
        public long Score { get; }

        private long GenerateScore()
        {
            var generateFirstDigit = new Func(cards =>
            {
                var cardGroups = cards.GroupBy(c => c).ToList();
                var groupCounts = cardGroups.OrderByDescending(g => g.Count()).Select(g => g.Count()).ToList();
                if (cardGroups.Count() == 1)
                {
                    return 7;
                }
                else if (cardGroups.Count() == 2 &amp;&amp; (cardGroups[0].Count() == 4 || cardGroups[0].Count() == 1))
                {
                    return 6;
                }
                else if (cardGroups.Count() == 2 &amp;&amp; (cardGroups[0].Count() == 3 || cardGroups[0].Count() == 2))
                {
                    return 5;
                }
                else if (cardGroups.Count() == 3 &amp;&amp; (cardGroups[0].Count() == 3 || cardGroups[1].Count() == 3 || cardGroups[2].Count() == 3))
                {
                    return 4;
                }
                else if (cardGroups.Count() == 3 &amp;&amp; groupCounts[0] == 2 &amp;&amp; groupCounts[1] == 2 &amp;&amp; groupCounts[2] == 1)
                {
                    return 3;
                }
                else if (cardGroups.Count() == 4)
                {
                    return 2;
                }
                else
                {
                    return 1;
                }
            });
            
            var resultString = new StringBuilder();

            var maxFistDigit = Day7Task2.CardValues.Keys.Select(card => generateFirstDigit(Cards.Replace('J', card))).Max();

            resultString.Append(maxFistDigit);
            
            foreach (var card in Cards)
            {
                resultString.Append(Day7Task2.CardValues[card]);
            }

            Console.WriteLine("Cards:{0} Score:{1}",Cards,resultString);
            return long.Parse(resultString.ToString());
        }
    }
}