day 3

src/aoc/Year2024/Day03/Day03.cs

@@ -1,20 +1,48 @@
+using System.Text.RegularExpressions;
+using mazharenko.AoCAgent.Generator;
+
 namespace aoc.Year2024.Day03;
 
 internal partial class Day03
 {
-    internal partial class Part1
-    {
-        public string Solve(string input)
-        {
-            throw new NotImplementedException();
-        }
-    }
+	internal partial class Part1
+	{
+		private readonly Example example = new(
+			"xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))",
+			161
+		);
+
+		public long Solve(string input)
+		{
+			var regex = new Regex(@"mul\((?<operand1>\d+),(?<operand2>\d+)\)");
+			return regex.Matches(input).Sum(m =>
+				int.Parse(m.Groups["operand1"].Value)
+				* int.Parse(m.Groups["operand2"].Value)
+			);
+		}
+	}
+
+	internal partial class Part2
+	{
+		private readonly Example example = new(
+			"xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))",
+			48
+		);
+
+		public long Solve(string input)
+		{
+			var regex = new Regex(@"do\(\)|don't\(\)|mul\((?<operand1>\d+),(?<operand2>\d+)\)");
 
-    internal partial class Part2
-    {
-        public string Solve(string input)
-        {
-            throw new NotImplementedException();
-        }
-    }
+			return regex.Matches(input)
+				.Aggregate((enabled: true, sum: 0),
+					(x, match) => match.Value switch
+					{
+						"do()" => (true, x.sum),
+						"don't()" => (false, x.sum),
+						_ => x.enabled 
+							? (true, x.sum + int.Parse(match.Groups["operand1"].Value) * int.Parse(match.Groups["operand2"].Value))
+							: x
+					}).sum;
+		}
+	}
 }

tests/AoC.Tests/InputTests.cs

@@ -6,11 +6,13 @@ namespace AoC.Tests;
 [GenerateInputTests(2024, nameof(GetCases))]
 internal partial class InputTests
 {
-    private static IEnumerable<PartInputCaseData> GetCases()
-    {
-	    yield return new PartInputCaseData(1, 1, "1889772");
-	    yield return new PartInputCaseData(1, 2, "23228917");
-	    yield return new PartInputCaseData(2, 1, "359");
-	    yield return new PartInputCaseData(2, 2, "418");
-    }
+	private static IEnumerable<PartInputCaseData> GetCases()
+	{
+		yield return new PartInputCaseData(1, 1, "1889772");
+		yield return new PartInputCaseData(1, 2, "23228917");
+		yield return new PartInputCaseData(2, 1, "359");
+		yield return new PartInputCaseData(2, 2, "418");
+		yield return new PartInputCaseData(3, 1, "173529487");
+		yield return new PartInputCaseData(3, 2, "99532691");
+	}
 }