[2024/3] Mull It Over (Part 1)

pfolta · Dec 3, 2024 · e6391d2 · e6391d2
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diff --git a/README.md b/README.md
@@ -26,7 +26,7 @@
 |     2021 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★    |   ★    |        |   ★    |   ★    |        |        |        |        |        |        |        |        |        |        |        |    26 |
 |     2022 |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★   |   ★    |   ★    |   ★    |   ★    |        |        |        |        |        |        |        |   ☆    |        |        |        |   ☆    |    28 |
 |     2023 |   ★   |   ★   |   ★   |   ★   |   ☆   |   ★   |   ☆   |       |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |    12 |
-|     2024 |   ★   |   ★   |       |       |       |       |       |       |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |     4 |
+|     2024 |   ★   |   ★   |   ☆   |       |       |       |       |       |       |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |        |     5 |
 
 ## 🛷 How to run
 
@@ -164,6 +164,7 @@ e.g. `HandyHaversacks`)*
 |                                           |   7 | [Camel Cards](https://adventofcode.com/2023/day/7)                                                     | [[Code](src/main/kotlin/adventofcode/year2023/Day07CamelCards.kt)]&nbsp;[[Test](src/test/kotlin/adventofcode/year2023/Day07CamelCardsSpec.kt)]                                               | `250474325`            |                                                  |
 | [**2024**](https://adventofcode.com/2024) |   1 | [Historian Hysteria](https://adventofcode.com/2024/day/1)                                              | [[Code](src/main/kotlin/adventofcode/year2024/Day01HistorianHysteria.kt)]&nbsp;[[Test](src/test/kotlin/adventofcode/year2024/Day01HistorianHysteriaSpec.kt)]                                 | `1970720`              | `17191599`                                       |
 |                                           |   2 | [Red-Nosed Reports](https://adventofcode.com/2024/day/2)                                               | [[Code](src/main/kotlin/adventofcode/year2024/Day02RedNosedReports.kt)]&nbsp;[[Test](src/test/kotlin/adventofcode/year2024/Day02RedNosedReportsSpec.kt)]                                     | `572`                  | `612`                                            |
+|                                           |   3 | [Mull It Over](https://adventofcode.com/2024/day/3)                                                    | [[Code](src/main/kotlin/adventofcode/year2024/Day03MullItOver.kt)]&nbsp;[[Test](src/test/kotlin/adventofcode/year2024/Day03MullItOverSpec.kt)]                                               | `174960292`            |                                                  |
 
 ## 🕯️ Useful commands
 

diff --git a/src/main/kotlin/adventofcode/year2024/Day03MullItOver.kt b/src/main/kotlin/adventofcode/year2024/Day03MullItOver.kt
@@ -0,0 +1,16 @@
+package adventofcode.year2024
+
+import adventofcode.Puzzle
+import adventofcode.PuzzleInput
+
+class Day03MullItOver(customInput: PuzzleInput? = null) : Puzzle(customInput) {
+    override fun partOne() =
+        mulRegex
+            .findAll(input)
+            .map { it.destructured }
+            .sumOf { (x, y) -> x.toInt() * y.toInt() }
+
+    companion object {
+        private val mulRegex = """mul\((\d{1,3}),(\d{1,3})\)""".toRegex()
+    }
+}