Advent of Code 2024 - Day 2

Day2.cs

// Uploaded as a gist instead in my AoC repo because I forgot to push yesterday :(

var content = File.ReadAllLines("input.txt");

int result = 0;
int secondResult = 0;
for (int i = 0; i < content.Length; i++)
{
    var line = content[i];
    if (string.IsNullOrEmpty(line))
        continue;

    var data = line.Split(' ').Select(int.Parse).ToArray();

    if (IsSafe(data))
    {
        result++;
    }

    if (IsSafe(data))
    {
        secondResult++;
    }
    else
    {
        for (int x = 0; x < data.Length; x++)
        {
            var tmp = line.Split(' ').Select(int.Parse).ToList();
            tmp.RemoveAt(x);
            if (IsSafe(tmp.ToArray()))
            {
                secondResult++;
                break;
            }
        }
    }

}
Console.WriteLine($"Result: {result}");
Console.WriteLine($"Result: {secondResult} (Part 2)");

bool IsSafe(int[] data)
{
    var a = Rule1(data);
    var b = Rule2(data);
    return a == false && b == false;
}

bool Rule1(int[] data)
{
    var p = new int[data.Length - 1];
    for (int i = 0; i < data.Length; i++)
    {
        if (i > 0)
        {
            p[i - 1] = data[i - 1] == data[i] ? 0 : data[i - 1] > data[i] ? 1 : -1;
        }
    }

    var a = 0;
    var b = 0;
    var c = 0;
    for (int i = 0; i < p.Length; i++)
    {
        if (p[i] == 0)
            a++;
        else if (p[i] == 1)
            b++;
        else if (p[i] == -1)
            c++;
    }

    var s = true;
    if (a > 0 && b == 0 && c == 0)
        s = false;
    else if (a == 0 && b > 0 && c == 0)
        s = false;
    else if (a == 0 && b == 0 && c > 0)
        s = false;

    return s;
}

bool Rule2(int[] data)
{
    bool s = false;
    for (int i = 0; i < data.Length; i++)
    {
        if (i > 0)
        {
            var abs = Math.Abs(data[i] - data[i - 1]);
            if (abs > 3 || abs < 1)
            {
                s = true;
            }
        }
    }

    return s;
}