day 6

AdventOfCode/Problems/AOC2025/Day6/TrashCompactor.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace AdventOfCode.Problems.AOC2025.Day6;
+[ProblemInfo(2025, 6, "Trash Compactor")]
+public partial class TrashCompactor : Problem<long, long>
+{
+	private long[][] _values = [];
+	private string[] _operators = [];
+	private IEnumerable<(char op, long[] values)> _part2Data = [];
+
+	public override void CalculatePart1()
+	{
+		for (int i = 0; i < _operators.Length; i++)
+		{
+			var op = _operators[i];
+			var col = _values.Select(r => r[i]).ToArray();
+			Part1 += op switch
+			{
+				"+" => col.Aggregate((a, b) => a + b),
+				"*" => col.Aggregate((a, b) => a * b),
+				_ => throw new InvalidOperationException()
+			};
+		}
+	}
+
+	public override void CalculatePart2()
+	{
+		foreach (var item in _part2Data)
+		{
+			Part2 += item.op switch
+			{
+				'+' => item.values.Aggregate((a, b) => a + b),
+				'*' => item.values.Aggregate((a, b) => a * b),
+				_ => throw new InvalidOperationException()
+			};
+		}
+	}
+
+	public override void LoadInput()
+	{
+		var lines = ReadInputLines("input.txt");
+		ParsePart1(lines);
+		ParsePart2(lines);
+	}
+
+	private void ParsePart1(string[] lines)
+	{
+		_values = lines[..^1].Select(l => LineMatch().Matches(l).Select(v => long.Parse(v.Value)).ToArray()).ToArray();
+		_operators = LineMatch().Matches(lines[^1]).Select(v => v.Value).ToArray();
+	}
+
+	private void ParsePart2(string[] lines)
+	{
+		var valueLines = lines[..^1];
+		var opLines = lines[^1];
+
+		var opPos = 0;
+		var len = 1;
+
+		var data = new List<(char op, string[] values)>();
+
+		for (int i = 1; i < opLines.Length; i++)
+		{
+			var curChar = opLines[i];
+			if (curChar != ' ' || i == opLines.Length - 1)
+			{
+				if (i == opLines.Length - 1)
+					len = opLines.Length - opPos + 1;
+				var op = opLines[opPos];
+				var values = valueLines.Select(v => v[opPos..(opPos + len - 1)]).ToArray();
+				data.Add((op, values));
+
+				len = 1;
+				opPos = i;
+			}
+			else
+				len++;
+		}
+
+		_part2Data = data.Select(v => (v.op, v.values.Transpose().Select(long.Parse).ToArray()));
+	}
+
+	[GeneratedRegex(@"(\S+)")]
+	private static partial Regex LineMatch();
+}