Solved riddle for AoC 2024 day 4 part 2.

Gentleman1983 · Dec 4, 2024 · 553398b · 553398b
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diff --git a/README.md b/README.md
@@ -17,7 +17,7 @@ To run all solutions, simply run `./gradlew run`. If you want to run the solutio
 ## Contributions:
 | Year    | Language(s)                                                  | Total Stars | Link to repository                                                                 |
 |---------|--------------------------------------------------------------|------------:|------------------------------------------------------------------------------------|
-| 2024    | Kotlin ![Kotlin](img/kotlin.png)                             |    6 / 50 ⭐ | [aoc2024](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2024)       |
+| 2024    | Kotlin ![Kotlin](img/kotlin.png)                             |    8 / 50 ⭐ | [aoc2024](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2024)       |
 | 2023    | Java ![Java](img/java.png), Kotlin ![Kotlin](img/kotlin.png) |   50 / 50 ⭐ | [aoc2023](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2023)       |
 | 2022    | Java ![Java](img/java.png), Kotlin ![Kotlin](img/kotlin.png) |   50 / 50 ⭐ | [aoc2022](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2022)       |
 | 2022    | Kotlin ![Kotlin](img/kotlin.png)                             |     2 / 2 ⭐ | [meilisearch](https://github.com/Gentleman1983/advent-of-code/tree/main/meili2022) |
@@ -28,5 +28,5 @@ To run all solutions, simply run `./gradlew run`. If you want to run the solutio
 | 2017    | Java ![Java](img/java.png), Kotlin ![Kotlin](img/kotlin.png) |   50 / 50 ⭐ | [aoc2017](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2017)       |
 | 2016    | Java ![Java](img/java.png), Kotlin ![Kotlin](img/kotlin.png) |   50 / 50 ⭐ | [aoc2016](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2016)       |
 | 2015    | Java ![Java](img/java.png), Kotlin ![Kotlin](img/kotlin.png) |   50 / 50 ⭐ | [aoc2015](https://github.com/Gentleman1983/advent-of-code/tree/main/aoc2015)       |
-| **SUM** |                                                              |   **458 ⭐** |                                                                                    |
+| **SUM** |                                                              |   **460 ⭐** |                                                                                    |
 
diff --git a/aoc2024/README.md b/aoc2024/README.md
@@ -13,7 +13,7 @@ For more information see https://adventofcode.com [2024](https://adventofcode.co
 | 1       | ⭐ ![Kotlin](../img/kotlin.png) | ⭐ ![Kotlin](../img/kotlin.png) |
 | 2       | ⭐ ![Kotlin](../img/kotlin.png) | ⭐ ![Kotlin](../img/kotlin.png) |
 | 3       | ⭐ ![Kotlin](../img/kotlin.png) | ⭐ ![Kotlin](../img/kotlin.png) |
-| 4       | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
+| 4       | ⭐ ![Kotlin](../img/kotlin.png) | ⭐ ![Kotlin](../img/kotlin.png) |
 | 5       | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
 | 6       | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
 | 7       | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
@@ -35,9 +35,9 @@ For more information see https://adventofcode.com [2024](https://adventofcode.co
 | 23      | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
 | 24      | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
 | 25      | ❌ ![Kotlin](../img/kotlin.png) | ❌ ![Kotlin](../img/kotlin.png) |
-| **SUM** | **3 ⭐**                        | **3 ⭐**                        |
+| **SUM** | **4 ⭐**                        | **4 ⭐**                        |
 
-Total: 6 ⭐
+Total: 8 ⭐
 
 ## Solution image
 N/A
diff --git a/aoc2024/aoc2024-kotlin/src/main/kotlin/de/havox_design/aoc2024/day04/CeresSearch.kt b/aoc2024/aoc2024-kotlin/src/main/kotlin/de/havox_design/aoc2024/day04/CeresSearch.kt
@@ -25,7 +25,23 @@ class CeresSearch(private var filename: String) {
             }
 
     fun processPart2(): Any =
-        0L
+        data
+            .indices
+            .sumOf { y ->
+                data[y]
+                    .indices
+                    .count { x ->
+                        if (data[y][x] != 'A') {
+                            return@count false
+                        }
+
+                        val n = data.getOrNull(y - 1) ?: return@count false
+                        val s = data.getOrNull(y + 1) ?: return@count false
+
+                        setOf(n.getOrNull(x - 1), s.getOrNull(x + 1)) == MS &&
+                                setOf(n.getOrNull(x + 1), s.getOrNull(x - 1)) == MS
+                    }
+            }
 
     private fun getResourceAsText(path: String): List<String> =
         this
@@ -37,5 +53,6 @@ class CeresSearch(private var filename: String) {
 
     companion object {
         private const val XMAS = "XMAS"
+        private val MS = setOf('M', 'S')
     }
 }
diff --git a/aoc2024/aoc2024-kotlin/src/test/kotlin/de/havox_design/aoc2024/day04/CeresSearchTest.kt b/aoc2024/aoc2024-kotlin/src/test/kotlin/de/havox_design/aoc2024/day04/CeresSearchTest.kt
@@ -28,7 +28,7 @@ class CeresSearchTest {
         @JvmStatic
         private fun getDataForTestProcessPart2(): Stream<Arguments> =
             Stream.of(
-                Arguments.of("de/havox_design/aoc2024/day04/day04part2sample.txt", 9)
+                Arguments.of("de/havox_design/aoc2024/day04/day04sample.txt", 9)
             )
     }
 }