Initial Commit

2024/Day01CSharp/Program.cs

@@ -0,0 +1,97 @@
+// See https://aka.ms/new-console-template for more information
+using AdventCommon;
+using System.Security.AccessControl;
+using System.Security.Cryptography.X509Certificates;
+
+/** P1 **/
+var p1exampleSln = Part01(new Day01Parsed("example-input.txt"));
+var p1puzzleSln = Part01(new Day01Parsed("puzzle-input.txt"));
+
+Console.WriteLine("Part01 Total Distance: " + p1exampleSln);
+Console.WriteLine("Part01 Total Distance: " + p1puzzleSln);
+
+/** P2 **/
+var p2exampleSln = Part02(new Day01Parsed("example-input.txt"));
+var p2puzzleSln = Part02(new Day01Parsed("puzzle-input.txt"));
+
+Console.WriteLine("Part02 Example Sum: " + p2exampleSln);
+Console.WriteLine("Part02 Puzzle Sum: " + p2puzzleSln);
+
+int GetDistance(int l, int r)
+{
+    return Math.Abs(l - r);
+}
+
+int Part01(Day01Parsed input)
+{
+    int distance = 0;
+    input.left.Sort();
+    input.right.Sort();
+
+    for (int i = 0; i < input.left.Count; i++)
+    {
+        distance += GetDistance(input.left[i], input.right[i]);
+    }
+
+    return distance;
+}
+
+int Part02(Day01Parsed input)
+{
+    int total = 0;
+
+    for (int i = 0; i < input.left.Count; i++)
+    {
+        var l = input.left[i];
+        total += l * input.GetSimilarity(l);
+    }
+
+    return total;
+}
+
+class Day01Parsed : AdventCommon.ParsedInput
+{
+    public List<int> left = new List<int>();
+    public List<int> right = new List<int>();
+
+    public int GetSimilarity(int value)
+    {
+        int instances = 0;
+
+        foreach (var item in right)
+        {
+            if (item == value)
+            {
+                instances++;
+            }
+        }
+
+        return instances;
+    }
+
+    public Day01Parsed(string fileName) : base(fileName) 
+    {
+        if (left.Count != right.Count)
+        {
+            throw new Exception("Improperly formatted input file");
+        }
+    }
+
+    public override bool ParseLine(string line, object? context = null)
+    {
+        var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+
+        if (split.Length != 2)
+        {
+            return false;
+        }
+
+        var l = Int32.Parse(split[0]);
+        var r = Int32.Parse(split[1]);
+
+        left.Add(l);
+        right.Add(r);
+
+        return true;
+    }
+}