finish day 15 and prepare 16

Author: EmRe-One

src/main/kotlin/tr/emreone/adventofcode/days/Day15.kt

@@ -0,0 +1,76 @@
+package tr.emreone.adventofcode.days
+
+import tr.emreone.kotlin_utils.automation.Day
+
+class Day15 : Day(15, 2023, "Lens Library") {
+
+    class Lens(val label: String, val focalLength: Int? = null) {
+
+        override fun hashCode(): Int {
+            var hash = 0
+
+            this.label.forEach {
+                hash += it.code
+                hash *= 17
+                hash = hash.mod(256)
+            }
+
+            return hash
+        }
+    }
+
+    override fun part1(): Long {
+        return inputAsString
+            .replace("\\s+".toRegex(), "")
+            .split(",")
+            .sumOf {
+                Lens(it, null).hashCode().toLong()
+            }
+    }
+
+    override fun part2(): Long {
+        val boxes = mutableMapOf<Int, MutableList<Lens>>()
+
+        inputAsString
+            .replace("\\s+".toRegex(), "")
+            .split(",")
+            .forEach {
+                val index = it.indexOfAny(listOf("=", "-"), 0)
+                val operation = it.get(index)
+                val (label, focalLength) = it.split(operation)
+
+                val lens = Lens(label, focalLength.takeIf { it.isNotEmpty() }?.toInt())
+                when (operation) {
+                    '-' -> {
+                        boxes.get(lens.hashCode())
+                            ?.removeAll { l ->
+                                l.label == label
+                            }
+                    }
+
+                    '=' -> {
+                        val box = boxes.getOrDefault(lens.hashCode(), mutableListOf())
+
+                        val i = box.indexOfFirst { it.label == label }
+                        if (i >= 0) {
+                            box.removeAt(i)
+                            box.add(i, lens)
+                        }
+                        else {
+                            box.add(lens)
+                        }
+
+                        boxes[lens.hashCode()] = box
+                    }
+                }
+            }
+
+        return boxes.filterValues { it.isNotEmpty() }
+            .entries
+            .sumOf { (indexBox, box) ->
+                box.mapIndexed { indexLens, lens ->
+                    (indexBox + 1) * (indexLens + 1) * lens.focalLength!!.toLong()
+                }.sum()
+            }
+    }
+}

src/main/kotlin/tr/emreone/adventofcode/days/Day16.kt

@@ -0,0 +1,9 @@
+package tr.emreone.adventofcode.days
+
+import tr.emreone.kotlin_utils.automation.Day
+
+class Day16: Day(16, 2023, "The Floor Will Be Lava") {
+
+
+
+}

src/test/kotlin/tr/emreone/adventofcode/days/Day15Test.kt

@@ -0,0 +1,17 @@
+package tr.emreone.adventofcode.days
+
+import org.junit.jupiter.api.Test
+import tr.emreone.kotlin_utils.Resources
+import tr.emreone.kotlin_utils.automation.solve
+
+internal class Day15Test {
+
+    @Test
+    fun `execute_tests`() {
+        solve<Day15>(false) {
+            Resources.resourceAsList("day15_example.txt")
+                .joinToString("\n") part1 1320 part2 145
+        }
+    }
+
+}

src/test/kotlin/tr/emreone/adventofcode/days/Day16Test.kt

@@ -0,0 +1,17 @@
+package tr.emreone.adventofcode.days
+
+import org.junit.jupiter.api.Test
+import tr.emreone.kotlin_utils.Resources
+import tr.emreone.kotlin_utils.automation.solve
+
+internal class Day16Test {
+
+    @Test
+    fun `execute_tests`() {
+        solve<Day16>(false) {
+            Resources.resourceAsList("day16_example.txt")
+                .joinToString("\n") part1 46
+        }
+    }
+
+}

src/test/resources/day15_example.txt

@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7

src/test/resources/day16_example.txt

@@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....