day 3 part 2

KaterynaKateryna · Dec 3, 2024 · c9cc77e · c9cc77e
1 parent c7a1afe
commit c9cc77e
Showing 1 changed file with 25 additions and 1 deletion.
diff --git a/AdventOfCode/Day03.cs b/AdventOfCode/Day03.cs
@@ -29,6 +29,30 @@ public override ValueTask<string> Solve_1()
 
     public override ValueTask<string> Solve_2()
     {
-        return new("");
+        long result = 0;
+
+        MatchCollection matches = Regex.Matches(_input, @"mul\([0-9]+,[0-9]+\)|do\(\)|don't\(\)");
+
+        bool enabled = true;
+        foreach (Match match in matches)
+        {
+            string value = match.Captures[0].Value;
+
+            if (value == "do()")
+            {
+                enabled = true;
+            }
+            else if (value == "don't()")
+            {
+                enabled = false;
+            }
+            else if (enabled)
+            {
+                string[] parts = value.Split(new[] { "mul(", ",", ")" }, StringSplitOptions.RemoveEmptyEntries);
+                result += long.Parse(parts[0]) * long.Parse(parts[1]);
+            }
+        }
+
+        return new(result.ToString());
     }
 }