Day 5 solution

A Deep Copy and a double-ended queue would have made this day much easier. I should add those. (Having trouble finding a generic deep copy that works in .net 6, though...I opted to rewrite my original List<List<char>> solution into List<string> in lieu of a deep copy so I wouldn't have to parse the input all over again.)

advent-of-code-2022.csproj

@@ -79,6 +79,8 @@
 	  <EmbeddedResource Include="inputs\03a.txt" />
 	  <None Remove="inputs\04a.txt" />
 	  <EmbeddedResource Include="inputs\04a.txt" />
+	  <None Remove="inputs\05a.txt" />
+	  <EmbeddedResource Include="inputs\05a.txt" />
 	</ItemGroup>
 
 </Project>

inputs/05a.txt

@@ -0,0 +1,9 @@
+    [D]
+[N] [C]
+[Z] [M] [P]
+ 1   2   3
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2

src/05.cs

@@ -0,0 +1,100 @@
+using System.Text;
+
+namespace aoc2022;
+
+internal class Day05 : Day
+{
+    struct Instruction
+    {
+        public int Num;
+        public int From;
+        public int To;
+    }
+
+    private readonly List<string> defaultLines = new();
+    private readonly List<Instruction> instructions = new();
+
+    internal override void Parse()
+    {
+        int state = 0;
+        foreach (var line in Util.ReadAllLines("05"))
+        {
+            if (state == 0)
+            {
+                if (line.Contains('['))
+                {
+                    int col = 0;
+                    for (int i = 1; i < line.Length; i += 4)
+                    {
+                        if (line[i] != ' ')
+                        {
+                            while (defaultLines.Count <= col)
+                            {
+                                defaultLines.Add(string.Empty);
+                            }
+                            defaultLines[col] += line[i];
+                        }
+
+                        col++;
+                    }
+                }
+                else if (string.IsNullOrEmpty(line))
+                {
+                    state = 1;
+                }
+
+                continue;
+            }
+
+            var inst = line.Split(' ');
+            instructions.Add(new Instruction()
+            {
+                Num = int.Parse(inst[1]),
+                From = int.Parse(inst[3]) - 1,
+                To = int.Parse(inst[5]) - 1,
+            });
+        }
+    }
+
+    internal override string Part1()
+    {
+        List<string> lines = new(defaultLines);
+        foreach (var inst in instructions)
+        {
+            for (int i = 0; i < inst.Num; i++)
+            {
+                var val = lines[inst.From].First();
+                lines[inst.From] = lines[inst.From][1..];
+                lines[inst.To] = lines[inst.To].Insert(0, val.ToString());
+            }
+        }
+
+        StringBuilder sb = new();
+        foreach (var line in lines)
+        {
+            sb.Append(line.First());
+        }
+        return $"CrateMover9000 final order: <+white>{sb}";
+    }
+
+    internal override string Part2()
+    {
+        List<string> lines = new(defaultLines);
+        foreach (var inst in instructions)
+        {
+            for (int i = 0; i < inst.Num; i++)
+            {
+                var val = lines[inst.From].First();
+                lines[inst.From] = lines[inst.From][1..];
+                lines[inst.To] = lines[inst.To].Insert(i, val.ToString());
+            }
+        }
+
+        StringBuilder sb = new();
+        foreach (var line in lines)
+        {
+            sb.Append(line.First());
+        }
+        return $"CrateMover9001 final order: <+white>{sb}";
+    }
+}