Solution 2015-16 (Aunt Sue)

Author: rhaendel

src/main/kotlin/de/ronny_h/aoc/year2015/day16/AuntSue.kt

@@ -0,0 +1,51 @@
+package de.ronny_h.aoc.year2015.day16
+
+import de.ronny_h.aoc.AdventOfCode
+
+fun main() = AuntSue().run(373, 260)
+
+class AuntSue : AdventOfCode<Int>(2015, 16) {
+    private val attributesFromTickerTape = mapOf(
+        "children" to 3,
+        "cats" to 7,
+        "samoyeds" to 2,
+        "pomeranians" to 3,
+        "akitas" to 0,
+        "vizslas" to 0,
+        "goldfish" to 5,
+        "trees" to 3,
+        "cars" to 2,
+        "perfumes" to 1,
+    )
+
+    override fun part1(input: List<String>): Int = input
+        .parseSues()
+        .filter { sue -> sue.attributes.all { attributesFromTickerTape.get(it.key) == it.value } }
+        .single()
+        .number
+
+    override fun part2(input: List<String>): Int = input
+        .parseSues()
+        .filter { sue ->
+            sue.attributes.all {
+                when (it.key) {
+                    "cats", "trees" -> attributesFromTickerTape.getValue(it.key) < it.value
+                    "pomeranians", "goldfish" -> attributesFromTickerTape.getValue(it.key) > it.value
+                    else -> attributesFromTickerTape.getValue(it.key) == it.value
+                }
+            }
+        }
+        .single()
+        .number
+}
+
+fun List<String>.parseSues() = map {
+    val (number, attributes) = it.substringAfter("Sue ").split(": ", limit = 2)
+    val attributeMap = attributes.split(", ").map { it.split(": ") }.associate { it[0] to it[1].toInt() }
+    Sue(number.toInt(), attributeMap)
+}
+
+data class Sue(
+    val number: Int,
+    val attributes: Map<String, Int>,
+)

src/test/kotlin/de/ronny_h/aoc/year2015/day16/AuntSueTest.kt

@@ -0,0 +1,33 @@
+package de.ronny_h.aoc.year2015.day16
+
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+
+class AuntSueTest : StringSpec({
+
+    val input = listOf(
+        "Sue 1: cars: 9, akitas: 3, goldfish: 0",
+        "Sue 2: akitas: 9, children: 3, samoyeds: 9",
+        "Sue 3: pomeranians: 3, perfumes: 1, vizslas: 0",
+        "Sue 4: goldfish: 0, vizslas: 0, samoyeds: 2",
+        "Sue 5: cats: 7, trees: 0, vizslas: 1",
+    )
+
+    "Sues can be parsed" {
+        input.parseSues() shouldBe listOf(
+            Sue(1, mapOf("cars" to 9, "akitas" to 3, "goldfish" to 0)),
+            Sue(2, mapOf("akitas" to 9, "children" to 3, "samoyeds" to 9)),
+            Sue(3, mapOf("pomeranians" to 3, "perfumes" to 1, "vizslas" to 0)),
+            Sue(4, mapOf("goldfish" to 0, "vizslas" to 0, "samoyeds" to 2)),
+            Sue(5, mapOf("cats" to 7, "trees" to 0, "vizslas" to 1)),
+        )
+    }
+
+    "part 1: The sue that matches all given attributes" {
+        AuntSue().part1(input) shouldBe 3
+    }
+
+    "part 2: The sue that matches all given attributes respecting the outdated retroencabulator" {
+        AuntSue().part2(input) shouldBe 4
+    }
+})