Merge pull request #1 from shadeon/day1

Day 1 - Calorie Counting

Author: shadeon

2022/C#/day1/code/Day1.cs

@@ -0,0 +1,38 @@
+public class Day1
+{
+    private readonly IEnumerable<string> _input = File.ReadLines(@".\data\input.txt");
+    private readonly IEnumerable<string> _sample = File.ReadLines(@".\data\sample.txt");
+
+    public int GetPart1Answer() => part1(_input);
+
+    public int GetPart1Sample() => part1(_sample);
+
+    private int part1(IEnumerable<string> input) => 
+        getElves(input)
+        .Max();
+
+    public int GetPart2Sample() => part2(_sample);
+
+    public int GetPart2Answer() => part2(_input);
+
+    private int part2(IEnumerable<string> input) =>
+        getElves(input)
+        .OrderByDescending(elf => elf)
+        .Take(3)
+        .Sum();
+
+    private IEnumerable<int> getElves(IEnumerable<string> input) => input
+        .Aggregate(newStack<List<int>>(), (acc, line) => {
+            if (int.TryParse(line, out var foodItem)) {
+                acc.Peek().Add(foodItem);
+            }
+            else {
+                acc.Push(new List<int>());
+            }
+            return acc;
+        })
+        .Select(elf => elf.Sum());
+
+    private Stack<T> newStack<T>() where T : new() => 
+        new Stack<T>(new [] {new T()});
+}

2022/C#/day1/code/Day1.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\data\**\*.*" LinkBase="data\" CopyToOutputDirectory="Always" CopyToPublishDirectory="Always"/>
+  </ItemGroup>
+
+</Project>

2022/C#/day1/code/Program.cs

@@ -0,0 +1,7 @@
+var day1 = new Day1();
+
+// Part 1
+Console.WriteLine($"Part 1 Answer: {day1.GetPart1Answer()}");
+
+// Part 2
+Console.WriteLine($"Part 2 Answer: {day1.GetPart2Answer()}");