Add .gitattributes, .gitignore, README.md, and LICENSE.txt. And commit the rest of the files.

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.11.35327.3
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Advent24", "Advent24\Advent24.csproj", "{A24F8A8E-13D6-494B-BDE6-CD21F23F75D8}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
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{A24F8A8E-13D6-494B-BDE6-CD21F23F75D8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{A24F8A8E-13D6-494B-BDE6-CD21F23F75D8}.Debug|Any CPU.Build.0 = Debug|Any CPU
{A24F8A8E-13D6-494B-BDE6-CD21F23F75D8}.Release|Any CPU.ActiveCfg = Release|Any CPU
{A24F8A8E-13D6-494B-BDE6-CD21F23F75D8}.Release|Any CPU.Build.0 = Release|Any CPU
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GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {5DF753A9-038C-4A9F-8AF8-B939E61DA6F4}
EndGlobalSection
EndGlobal

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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using System;
using System.Collections;
namespace Advent24
{
internal class Program
{
static void Main(string[] args)
{
string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd1.txt");
var pairsArray = fileData.Split('\n');
var list1 = new SortedList<Int32, Int32>(pairsArray.Length);
var list2 = new SortedList<Int32, Int32>(pairsArray.Length);
foreach(var pair in pairsArray)
{
if (System.String.IsNullOrEmpty(pair)) continue;
// pairArray has 4 elements, and the middle two are blanks
// because there are 3 spaces between the two numbers
var pairArray = pair.Split(' ');
Int32 myInteger = System.Convert.ToInt32(pairArray[0]);
if (list1.TryGetValue(myInteger, out int value1)) list1[myInteger] = ++value1;
else list1.Add(myInteger, 1);
Console.WriteLine("{0:d} {1:d}", myInteger, list1[myInteger]);
myInteger = System.Convert.ToInt32(pairArray[3]);
if (list2.TryGetValue(myInteger, out int value2)) list2[myInteger] = ++value2;
else list2.Add(myInteger, 1);
Console.WriteLine("{0:d} {1:d}", myInteger, list2[myInteger]);
}
Int32 sumOfDifferences = 0;
Int32 i = 0, j = 0;
var list1Copy = new SortedList<Int32, Int32>(list1);
var list2Copy = new SortedList<Int32, Int32>(list2);
while (i < list1.Count && j < list2.Count)
{
Int32 value1 = list1.GetKeyAtIndex(i);
Int32 value2 = list2.GetKeyAtIndex(j);
if (value1 > value2) sumOfDifferences += (value1 - value2);
else sumOfDifferences += (value2 - value1);
list1[value1]--; list2[value2]--;
if (list1[value1] == 0) i++;
if (list2[value2] == 0) j++;
}
Console.WriteLine("{0:s} {1:d}", "Sum of differences = ", sumOfDifferences);
i = 0; Int32 similarityScore = 0;
while (i < list1Copy.Count)
{
Int32 value1 = list1Copy.GetKeyAtIndex(i);
list2Copy.TryGetValue(value1, out Int32 numberOfAppearancesInList2);
// default value of Int32 numberOfAppearancesInList2 is 0
similarityScore += value1 * numberOfAppearancesInList2;
list1Copy[value1]--;
if (list1Copy[value1] == 0) i++;
}
Console.WriteLine("{0:s} {1:d}", "Similarity score = ", similarityScore);
Console.ReadLine();
}
}
}

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MIT License
Copyright (c) [year] [fullname]
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Advent24
My solutions to Advent of Code 2024 in C# (which I haven't used before) to familiarise myself with its idioms.