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/h/slackernews House Racist Founder
everyone who/whom 7 legs of love :marseyspider:  2yr ago (text post) 234 thread views #130976

The luckiest of days, Day 13!!

Let's fricking gooo!

17
New Old Top Bottom Controversial Random
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[[[ packets ]]] :marseycapymerchant:

https://wtools.io/paste-code/bHYu

namespace AOC2022.Puzzles;

public class Day13 : IPuzzle
{
	private readonly string[] _linesFromFile;

	public Day13(string[] linesFromFile)
	{
		_linesFromFile = linesFromFile;
	}

	public void SolveFirstPuzzle()
	{
		var initialScore = 0;
		for (var index = 0; index < _linesFromFile.Length; index += 3)
		{
			var leftNode = ParseNode(_linesFromFile[index]);
			var rightNode = ParseNode(_linesFromFile[index + 1]);
			if (CompareNodes(leftNode, rightNode) < 0)
				initialScore += index / 3 + 1;
		}

		Console.WriteLine($"Part 1 answer: {initialScore}");
	}

	public void SolveSecondPuzzle()
	{
		var packets = new List<PacketNode>();
		for (var index = 0; index < _linesFromFile.Length; index += 3)
		{
			var left = ParseNode(_linesFromFile[index]);
			var right = ParseNode(_linesFromFile[index + 1]);
			packets.Add(right);
			packets.Add(left);
		}

		const string t2 = "[[2]]";
		const string t6 = "[[6]]";
		packets.Add(ParseNode(t2));
		packets.Add(ParseNode(t6));
		packets.Sort(CompareNodes);

		var initialScore = 1;
		for (var i = 0; i < packets.Count; i++)
			if (packets[i]._stringValue is "[[2]]" or "[[6]]")
				initialScore *= i + 1;
		Console.WriteLine($"Part 2 answer: {initialScore}");
	}

	private class PacketNode
	{
		public bool _isANumber;
		public string? _stringValue;
		public int _value;
		public readonly List<PacketNode> _childNodes = new();

		public override string ToString()
		{
			return _isANumber ? $"N: {_value}" : $"Ch: {_childNodes.Count}";
		}
	}

	private static int CompareNodes(PacketNode leftPacketNode, PacketNode rightPacketNode)
	{
		switch (leftPacketNode._isANumber)
		{
			case true when rightPacketNode._isANumber:
			{
				if (leftPacketNode._value < rightPacketNode._value)
					return -1;
				if (leftPacketNode._value > rightPacketNode._value)
					return +1;
				return 0;
			}
			case false when !rightPacketNode._isANumber:
			{
				var i = 0;
				while (true)
				{
					if (i >= leftPacketNode._childNodes.Count && i < rightPacketNode._childNodes.Count)
						return -1;
					if (i >= rightPacketNode._childNodes.Count && i < leftPacketNode._childNodes.Count)
						return +1;
					if (i == rightPacketNode._childNodes.Count && i == leftPacketNode._childNodes.Count)
						return 0;
					var c = CompareNodes(leftPacketNode._childNodes[i], rightPacketNode._childNodes[i]);
					if (c != 0) return c;
					++i;
				}
			}
			case true when !rightPacketNode._isANumber:
			{
				var c = CompareNodes(NumToList(leftPacketNode), rightPacketNode);
				return c != 0 ? c : 0;
			}
		}

		if (leftPacketNode._isANumber || !rightPacketNode._isANumber) return 0;
		{
			var c = CompareNodes(leftPacketNode, NumToList(rightPacketNode));
			return c != 0 ? c : 0;
		}

		PacketNode NumToList(PacketNode n)
		{
			var n1 = new PacketNode();
			n1._childNodes.Add(n);
			return n1;
		}
	}

	private static PacketNode ParseNode(string line)
	{
		var index = 0;
		var p = RecurseThroughNodes(line, ref index);
		p._stringValue = line;
		return p;
	}

	private static PacketNode RecurseThroughNodes(string line, ref int i)
	{
		var packetNode = new PacketNode();
		if (i == 0)
		{
			++i;
		}

		while (true)
		{
			var charAtI = line[i++];
			switch (charAtI)
			{
				case '[':
					packetNode._childNodes.Add(RecurseThroughNodes(line, ref i));
					break;
				case ']':
					return packetNode;
				default:
				{
					if (char.IsDigit(charAtI))
					{
						var val = charAtI - '0';
						while (char.IsDigit(line[i]))
							val = 10 * val + (line[i++] - '0');
						packetNode._childNodes.Add(new PacketNode {_isANumber = true, _value = val});
					}

					break;
				}
			}
		}
	}
}

![](/images/16709136145570378.webp)

Ignore my shit function naming, i thought of one thing and first and then did something diff after
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you're fricking bananas if you think I'm reading all that, take my downkong and shut up idiot

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