Day03

advent-of-code-2024.sln

@@ -13,6 +13,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day02", "day02\day02.csproj
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day02tests", "tests\day02tests\day02tests.csproj", "{53D76378-35A0-42AE-8C64-47FA2957F9C1}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day03", "day03\day03.csproj", "{8E5409C0-98EB-4952-9F35-75D98EEBF2B3}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day03tests", "tests\day03tests\day03tests.csproj", "{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -38,9 +42,18 @@ Global
 		{53D76378-35A0-42AE-8C64-47FA2957F9C1}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{53D76378-35A0-42AE-8C64-47FA2957F9C1}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{53D76378-35A0-42AE-8C64-47FA2957F9C1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8E5409C0-98EB-4952-9F35-75D98EEBF2B3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8E5409C0-98EB-4952-9F35-75D98EEBF2B3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8E5409C0-98EB-4952-9F35-75D98EEBF2B3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8E5409C0-98EB-4952-9F35-75D98EEBF2B3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{0F1C1F9C-FDF2-4025-B60E-485EAD0C3905} = {F2656488-9555-4789-A912-089F50725E8D}
 		{53D76378-35A0-42AE-8C64-47FA2957F9C1} = {F2656488-9555-4789-A912-089F50725E8D}
+		{054C50A4-27D6-4E16-8A7D-FBC9E0EFD417} = {F2656488-9555-4789-A912-089F50725E8D}
 	EndGlobalSection
 EndGlobal

day03/Program.cs

@@ -0,0 +1,68 @@
+using System.Text.RegularExpressions;
+
+var line = File.ReadAllText("input.txt");
+
+var computer = new Computer(line);
+var sumOfUncorruptedMemory = computer.CalculateSumOfUncorruptedMemory();
+Console.WriteLine($"Sum of multiplications: {sumOfUncorruptedMemory}");
+
+var sumOfUncorruptedMemoryAccountingForDosAndDonts = computer.CalculateSumOfUncorruptedMemoryAccountingForDosAndDonts();
+System.Console.WriteLine($"Sum of multiplications accounting for Do() and Don't(): {sumOfUncorruptedMemoryAccountingForDosAndDonts}");
+
+
+public partial class Computer(string corruptedMemory)
+{
+    private readonly string corruptedMemory = corruptedMemory;
+
+    [GeneratedRegex(@"(mul\(\d{1,3},\d{1,3}\))")]
+    private partial Regex MultiplierStatementRegex();
+    [GeneratedRegex(@"(mul\(\d{1,3},\d{1,3}\))|(don't\(\))|(do\(\))")]
+    private partial Regex AllStatementsRegex();
+    [GeneratedRegex(@"mul\((\d{1,3}),(\d{1,3})\)")]
+    private partial Regex MultiplierRegex();
+
+    public int CalculateSumOfUncorruptedMemory()
+    {
+        var sum = 0;
+        var matches = MultiplierStatementRegex().Matches(corruptedMemory);
+
+        foreach (Match match in matches)
+        {
+            var mulMatch = MultiplierRegex().Match(match.Value);
+            var firstNumber = int.Parse(mulMatch.Groups[1].Value);
+            var secondNumber = int.Parse(mulMatch.Groups[2].Value);
+
+            sum += firstNumber * secondNumber;
+        }
+
+        return sum;
+    }
+
+    public int CalculateSumOfUncorruptedMemoryAccountingForDosAndDonts()
+    {
+        var sum = 0;
+        var matches = AllStatementsRegex().Matches(corruptedMemory);
+        var enabled = true;
+
+        foreach (Match match in matches)
+        {
+            switch (match.Value)
+            {
+                case string x when x.StartsWith("mul") && enabled:
+                    var mulMatch = MultiplierRegex().Match(match.Value);
+                    var firstNumber = int.Parse(mulMatch.Groups[1].Value);
+                    var secondNumber = int.Parse(mulMatch.Groups[2].Value);
+                    sum += firstNumber * secondNumber;
+                    break;
+                case string x when x.Equals("do()"):
+                    enabled = true;
+                    break;
+                case string x when x.Equals("don't()"):
+                    enabled = false;
+                    break;
+            }
+        }
+
+        return sum;
+    }
+}

day03/day03.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

tests/day03tests/GlobalUsings.cs

@@ -0,0 +1,2 @@
+global using Shouldly;
+

tests/day03tests/UnitTests.cs

@@ -0,0 +1,20 @@
+namespace day03tests;
+
+public class UnitTests
+{
+    [Fact]
+    public void ShouldReturnSumOfMul()
+    {
+        var computer = new Computer("xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))");
+        var sum = computer.CalculateSumOfUncorruptedMemory();
+        sum.ShouldBe(161);
+    }
+
+    [Fact]
+    public void ShouldReturnSumOfMulAccountingforDosAndDonts()
+    {
+        var computer = new Computer("xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))");
+        var sum = computer.CalculateSumOfUncorruptedMemoryAccountingForDosAndDonts();
+        sum.ShouldBe(48);
+    }
+}

tests/day03tests/day03tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="Shouldly" Version="4.2.1" />
+    <PackageReference Include="xunit" Version="2.6.6" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\day03\day03.csproj" />
+  </ItemGroup>
+
+</Project>