2023 day 1

AOC.Test/Test2023.cs

@@ -6,7 +6,12 @@ namespace AOC.Test;
 public class Test2023
 {
     [DataTestMethod]
-    [DataRow(typeof(Day01), "", "")]
+    [DataRow(typeof(Day01), "54331", "54518")]
     public void CheckAllDays(Type dayType, string part1, string part2) =>
         Common.CheckDay(dayType, part1, part2);
+    
+    [DataTestMethod]
+    [DataRow(typeof(Day01), "142", "142")] // unfortunately p2 example is different
+    public void CheckTestInputs(Type dayType, string part1, string part2) =>
+        Common.CheckDay(dayType, part1, part2, true);
 }

AOC2023/Day01.cs

@@ -2,11 +2,41 @@ namespace AOC2023;
 
 public class Day01() : Day(2023, 1, "Puzzle Name")
 {
-    public override void ProcessInput()
-    {
-    }
+	private static readonly List<string> _singleDigits = 
+		["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
 
-    public override object Part1() => "";
+	public override void ProcessInput()
+	{
+	}
 
-    public override object Part2() => "";
+	public override object Part1() =>
+		Input.Sum(line => (line.First(char.IsDigit) - '0') * 10 + (line.Last(char.IsDigit) - '0'));
+
+	public override object Part2()
+	{
+		return Input.Sum(line =>
+		{
+			List<int> digits = new();
+
+			for (var i = 0; i < line.Length; i++)
+			{
+				if (char.IsDigit(line[i]))
+				{
+					digits.Add(item: line[i] - '0');
+					continue;
+				}
+
+				foreach (var (digit, spelled) in _singleDigits.Indexed())
+				{
+					if (i + spelled.Length - 1 >= line.Length || line[i..(i + spelled.Length)] != spelled)
+						continue;
+
+					digits.Add(digit);
+					break;
+				}
+			}
+
+			return digits.First() * 10 + digits.Last();
+		});
+	}
 }

AOC2023/input2023/test01.in

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet