Day08 part 1

AdventOfCode2018.Tests/AdventOfCode2018.Tests.csproj

@@ -56,6 +56,7 @@
     <Otherwise />
   </Choose>
   <ItemGroup>
+    <Compile Include="ChronoLicenceNode_Tests.cs" />
     <Compile Include="ChronoPoint_Tests.cs" />
     <Compile Include="Claim_Tests.cs" />
     <Compile Include="Day01_Tests.cs" />
@@ -65,6 +66,7 @@
     <Compile Include="Day05_Tests.cs" />
     <Compile Include="Day06_Tests.cs" />
     <Compile Include="Day07_Tests.cs" />
+    <Compile Include="Day08_Tests.cs" />
     <Compile Include="GuardEvent_Tests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>

AdventOfCode2018.Tests/ChronoLicenceNode_Tests.cs

@@ -0,0 +1,37 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AdventOfCode2018.Tests
+{
+    [TestClass()]
+    public class ChronoLicenceNode_Tests
+    {
+        [TestMethod()]
+        public void BuildFromIntStream__Test()
+        {
+            Day08 day = new Day08();
+
+            IntStream values = new IntStream("2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2");
+            ChronoLicenceNode result = ChronoLicenceNode.BuildFromIntStream(values);
+
+            Assert.AreEqual(2, result.Childs.Count);
+            Assert.AreEqual(3, result.Metadata.Count);
+            Assert.AreEqual(1, result.Metadata[0]);
+            Assert.AreEqual(1, result.Metadata[1]);
+            Assert.AreEqual(2, result.Metadata[2]);
+
+            Assert.AreEqual(0, result.Childs[0].Childs.Count);
+            Assert.AreEqual(3, result.Childs[0].Metadata.Count);
+            Assert.AreEqual(10, result.Childs[0].Metadata[0]);
+            Assert.AreEqual(11, result.Childs[0].Metadata[1]);
+            Assert.AreEqual(12, result.Childs[0].Metadata[2]);
+
+            Assert.AreEqual(1, result.Childs[1].Childs.Count);
+            Assert.AreEqual(1, result.Childs[1].Metadata.Count);
+            Assert.AreEqual(2, result.Childs[1].Metadata[0]);
+
+            Assert.AreEqual(0, result.Childs[1].Childs[0].Childs.Count);
+            Assert.AreEqual(1, result.Childs[1].Childs[0].Metadata.Count);
+            Assert.AreEqual(99, result.Childs[1].Childs[0].Metadata[0]);
+        }
+    }
+}

AdventOfCode2018.Tests/Day08_Tests.cs

@@ -0,0 +1,18 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AdventOfCode2018.Tests
+{
+    [TestClass()]
+    public class Day08_Tests
+    {
+        [TestMethod()]
+        public void ResolvePart1__Test()
+        {
+            Day08 day = new Day08();
+
+            string result = day.ResolvePart1(new string[] { "2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2", });
+
+            Assert.AreEqual("138", result);
+        }
+    }
+}

AdventOfCode2018/AdventOfCode2018.csproj

@@ -50,6 +50,7 @@
     <Compile Include="Day05.cs" />
     <Compile Include="Day06.cs" />
     <Compile Include="Day07.cs" />
+    <Compile Include="Day08.cs" />
     <Compile Include="IDay.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -76,6 +77,9 @@
     <Content Include="inputs\Day07.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="inputs\Day08.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

AdventOfCode2018/Day08.cs

@@ -0,0 +1,119 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace AdventOfCode2018
+{
+    /*
+    --- Day 8: Memory Maneuver ---
+
+    The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither you nor the Elves know which way the North Pole is from here.
+
+    You check your wrist device for anything that might help. It seems to have some kind of navigation system! Activating the navigation system produces more bad news: "Failed to start navigation system. Could not read software license file."
+
+    The navigation system's license file consists of a list of numbers (your puzzle input). The numbers define a data structure which, when processed, produces some kind of tree that can be used to calculate the license number.
+
+    The tree is made up of nodes; a single, outermost node forms the tree's root, and it contains all other nodes in the tree (or contains nodes that contain nodes, and so on).
+
+    Specifically, a node consists of:
+
+        A header, which is always exactly two numbers:
+            The quantity of child nodes.
+            The quantity of metadata entries.
+        Zero or more child nodes (as specified in the header).
+        One or more metadata entries (as specified in the header).
+
+    Each child node is itself a node that has its own header, child nodes, and metadata. For example:
+
+    2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2
+    A----------------------------------
+        B----------- C-----------
+                         D-----
+
+    In this example, each node of the tree is also marked with an underline starting with a letter for easier identification. In it, there are four nodes:
+
+        A, which has 2 child nodes (B, C) and 3 metadata entries (1, 1, 2).
+        B, which has 0 child nodes and 3 metadata entries (10, 11, 12).
+        C, which has 1 child node (D) and 1 metadata entry (2).
+        D, which has 0 child nodes and 1 metadata entry (99).
+
+    The first check done on the license file is to simply add up all of the metadata entries. In this example, that sum is 1+1+2+10+11+12+2+99=138.
+
+    What is the sum of all metadata entries?
+
+    */
+
+    public class Day08 : IDay
+    {
+        public string ResolvePart1(string[] inputs)
+        {
+            IntStream values = new IntStream(inputs[0]);
+            ChronoLicenceNode licenceTree = ChronoLicenceNode.BuildFromIntStream(values);
+            int result = licenceTree.GetChecksum();
+            return result.ToString();
+        }
+
+        public string ResolvePart2(string[] inputs)
+        {
+            return null;
+        }
+    }
+    public class IntStream
+    {
+        private int[] values;
+        private int index;
+
+        public IntStream(string strValues)
+        {
+            values = strValues
+                .Split(new string[] { " ", "" }, StringSplitOptions.RemoveEmptyEntries)
+                .Select(strVal => Convert.ToInt32(strVal))
+                .ToArray();
+            index = 0;
+        }
+
+        public int Get()
+        {
+            int value = values[index];
+            index++;
+            return value;
+        }
+    }
+
+    public class ChronoLicenceNode
+    {
+        public List<ChronoLicenceNode> Childs { get; } = new List<ChronoLicenceNode>();
+
+        public List<int> Metadata { get; } = new List<int>();
+
+        public static ChronoLicenceNode BuildFromIntStream(IntStream stream)
+        {
+            ChronoLicenceNode node = new ChronoLicenceNode();
+            int numChilds = stream.Get();
+            int numMetadata = stream.Get();
+
+            for (int i = 0; i < numChilds; i++)
+            {
+                ChronoLicenceNode childNode = BuildFromIntStream(stream);
+                node.Childs.Add(childNode);
+            }
+
+            for (int i = 0; i < numMetadata; i++)
+            {
+                node.Metadata.Add(stream.Get());
+            }
+
+            return node;
+        }
+
+        public int GetChecksum()
+        {
+            int checksum = Metadata.Sum();
+            foreach (ChronoLicenceNode child in Childs)
+            {
+                checksum += child.GetChecksum();
+            }
+            return checksum;
+        }
+    }
+}

AdventOfCode2018/Program.cs

@@ -7,7 +7,7 @@ namespace AdventOfCode2018
     {
         private static void Main(string[] args)
         {
-            int currentDayNumber = 7;
+            int currentDayNumber = 8;
             IDay currentDay = null;
 
             switch (currentDayNumber)
@@ -19,6 +19,7 @@ namespace AdventOfCode2018
                 case 5: currentDay = new Day05(); break;
                 case 6: currentDay = new Day06(); break;
                 case 7: currentDay = new Day07(); break;
+                case 8: currentDay = new Day08(); break;
             }
 
             string[] linesDay = File.ReadAllLines(string.Format("inputs/Day{0:00}.txt", currentDayNumber));