2024 day 1

Solutions/2024/Day01.cs

···
+namespace Solutions._2024;
+
+/// <summary>
+/// <a href="https://adventofcode.com/2024/day/1">Day 1</a>
+/// </summary>
+public sealed class Day01() : Day(2024, 1, "")
+{
+    private List<int> _list1 = [];
+    private List<int> _list2 = [];
+
+    public override void ProcessInput()
+    {
+        var l = Input.Select(line =>
+            line.Split(' ', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries)).ToList();
+        _list1 = l.Select(line => line[0]).Select(int.Parse).ToList();
+        _list2 = l.Select(line => line[1]).Select(int.Parse).ToList();
+    }
+
+    public override object Part1() =>
+        _list1.OrderBy(c => c).Zip(_list2.OrderBy(c => c)).Sum(i => Math.Abs(i.First - i.Second));
+
+    public override object Part2()
+    {
+        var grouped = _list2.GroupBy(c => c).ToDictionary(c => c.Key, c => c.Count());
+
+        return _list1.Sum(i =>
+        {
+            grouped.TryGetValue(i, out var c);
+            return i * c;
+        });
+    }
+}

Solutions/input/2024/day01.in

···
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+11545   62220
+66798   22932
+13234   29652
+70506   72520
+36041   79205
+78007   10461
+59850   67041
+77378   67041
+34128   94333
+31147   33438
+45913   33438
+97727   61839
+25073   25778
+86251   43258
+58420   55502
+43354   78836
+68038   86251
+67290   33438
+90859   59151
+67710   66807
+48934   16778
+22667   86065
+72666   22924
+77601   64359
+20458   10777
+99233   89451
+54526   13900
+79270   75407
+51276   23062
+54733   98555
+60594   40919
+61152   92938
+74123   42757
+13243   19555
+55324   20819
+55894   23062
+16368   34399
+16600   74703
+59353   72520
+19565   11393
+71782   87009
+31511   86251
+83349   96101
+23853   40439
+53938   19555
+18254   32811
+86817   33438
+78957   74568

Solutions/input/2024/test01.in

···
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3

Tests/Test2024.cs

···
+using Solutions._2024;
+namespace Tests;
+
+[TestClass]
+public class Test2024
+{
+    [DataTestMethod]
+    [DataRow(typeof(Day01), "1319616", "27267728")]
+    public void CheckAllDays(Type dayType, string part1, string part2) =>
+        Common.CheckDay(dayType, part1, part2);
+    
+    [DataTestMethod]
+    [DataRow(typeof(Day01), "11", "31")]
+    public void CheckTestInputs(Type dayType, string part1, string part2) =>
+        Common.CheckDay(dayType, part1, part2, true);
+}