this post was submitted on 02 Dec 2023
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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.

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🦌 - 2023 DAY 2 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 2: Cube Conundrum

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[–] Nighed@sffa.community 3 points 11 months ago* (last edited 11 months ago)

Done in C# Input parsing done with a mixture of splits and Regex (no idea why everyone hates it?) capture groups.

I have overbuilt for both days, but not tripped on any of the 'traps' in the input data - generally expecting the input to be worse than it is... too used to actual data from users

Input Parsing (common)

public class Day2RoundInput { private Regex gameNumRegex = new Regex("[a-z]* ([0-9]*)", RegexOptions.IgnoreCase);

    public Day2RoundInput(string gameString)
    {
        var colonSplit = gameString.Trim().Split(':', StringSplitOptions.RemoveEmptyEntries);
        var match = gameNumRegex.Match(colonSplit[0].Trim());
        var gameNumberString = match.Groups[1].Value;
        GameNumber = int.Parse(gameNumberString.Trim());

        HandfulsOfCubes = new List();
        var roundsSplit = colonSplit[1].Trim().Split(';', StringSplitOptions.RemoveEmptyEntries);
        foreach (var round in roundsSplit)
        {
            HandfulsOfCubes.Add(new HandfulCubes(round));
        }
    }
    public int GameNumber { get; set; }

    public List HandfulsOfCubes { get; set; }

    public class HandfulCubes
    {
        private Regex colourRegex = new Regex("([0-9]*) (red|green|blue)");

        public HandfulCubes(string roundString)
        {
            var colourCounts = roundString.Split(',', StringSplitOptions.RemoveEmptyEntries);
            foreach (var colour in colourCounts)
            {
                var matches = colourRegex.Matches(colour.Trim());

                foreach (Match match in matches)
                {
                    var captureOne = match.Groups[1];

                    var count = int.Parse(captureOne.Value.Trim());

                    var captureTwo = match.Groups[2];

                    switch (captureTwo.Value.Trim().ToLower())
                    {
                        case "red":
                            RedCount = count;
                            break;
                        case "green":
                            GreenCount = count;
                            break;
                        case "blue":
                            BlueCount = count;
                            break;
                        default: throw new Exception("uh oh");
                    }
                }
            }
        }

        public int RedCount { get; set; }
        public int GreenCount { get; set; }
        public int BlueCount { get; set; }
    }

}

Task1internal class Day2Task1:IRunnable { public void Run() { var inputs = GetInputs();

        var maxAllowedRed = 12;
        var maxAllowedGreen = 13;
        var maxAllowedBlue = 14;

        var allowedGameIdSum = 0;

        foreach ( var game in inputs ) { 
            var maxRed = game.HandfulsOfCubes.Select(h => h.RedCount).Max();
            var maxGreen = game.HandfulsOfCubes.Select(h => h.GreenCount).Max();
            var maxBlue = game.HandfulsOfCubes.Select(h => h.BlueCount).Max();

            if ( maxRed <= maxAllowedRed && maxGreen <= maxAllowedGreen && maxBlue <= maxAllowedBlue) 
            {
                allowedGameIdSum += game.GameNumber;
                Console.WriteLine("Game:" + game.GameNumber + " allowed");
            }
            else
            {
                Console.WriteLine("Game:" + game.GameNumber + "not allowed");
            }
        }

        Console.WriteLine("Sum:" + allowedGameIdSum.ToString());

    }

    private List GetInputs()
    {
        List inputs = new List();

        var textLines = File.ReadAllLines("Days/Two/Day2Input.txt");

        foreach (var line in textLines)
        {
            inputs.Add(new Day2RoundInput(line));
        }

        return inputs;
    }

    
}

Task2internal class Day2Task2:IRunnable { public void Run() { var inputs = GetInputs();

        var result = 0;

        foreach ( var game in inputs ) {
            var maxRed = game.HandfulsOfCubes.Select(h => h.RedCount).Max();
            var maxGreen = game.HandfulsOfCubes.Select(h => h.GreenCount).Max();
            var maxBlue = game.HandfulsOfCubes.Select(h => h.BlueCount).Max();

            var power = maxRed*maxGreen*maxBlue;
            Console.WriteLine("Game:" + game.GameNumber + " Result:" + power.ToString());

            result += power;
        }

        Console.WriteLine("Day2 Task2 Result:" + result.ToString());

    }

    private List GetInputs()
    {
        List inputs = new List();

        var textLines = File.ReadAllLines("Days/Two/Day2Input.txt");
        //var textLines = File.ReadAllLines("Days/Two/Day2ExampleInput.txt");

        foreach (var line in textLines)
        {
            inputs.Add(new Day2RoundInput(line));
        }

        return inputs;
    }

    
}