2023 - Day 15 - part 1

src/main/kotlin/no/rodland/advent_2023/Day15.kt

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+package no.rodland.advent_2023
+
+import no.rodland.advent.Day
+
+// template generated: 15/12/2023
+// Fredrik Rødland 2023
+
+class Day15(val input: List<String>) : Day<Int, Long, List<CharArray>> {
+
+    private val parsed = input.parse()
+
+    override fun partOne(): Int {
+        return parsed.sumOf { it.hash() }
+    }
+
+    private fun CharArray.hash() = fold(0) { acc, c -> ((c.code + acc) * 17).mod(256) }
+
+    override fun partTwo(): Long {
+        return 2
+    }
+
+    override fun List<String>.parse(): List<CharArray> {
+        return first().split(",").map { it.toCharArray() }
+    }
+
+    override val day = "15".toInt()
+}
+

src/test/kotlin/no/rodland/advent_2023/Day15Test.kt

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+package no.rodland.advent_2023
+
+import no.rodland.advent.*
+import org.junit.jupiter.api.Nested
+import org.junit.jupiter.api.Test
+import readFile
+
+//
+//  run: download_aoc_input.sh to download input
+//
+
+@Suppress("ClassName")
+@DisableSlow
+internal class Day15Test {
+    private val data15 = "2023/input_15.txt".readFile()
+    private val test15 = "2023/input_15_test.txt".readFile()
+
+    private val resultTestOne = 1320
+    private val resultTestTwo = 2L
+    private val resultOne = 522547
+    private val resultTwo = 2L
+
+    val test = defaultTestSuiteParseOnInit(
+        Day15(data15),
+        Day15(test15),
+        resultTestOne,
+        resultOne,
+        resultTestTwo,
+        resultTwo,
+        { Day15(data15) },
+        { Day15(test15) },
+    )
+
+    @Nested
+    inner class Init {
+        @Test
+        fun `15,-,example,1`() {
+            report(AOCTest({ "123".toInt() }, Unit, 123, 5, "15".toInt(), Part.TWO, false, "example"))
+        }
+
+        @Test
+        fun `15,-,example,2`() {
+            report(test.initTest.copy())
+        }
+
+        @Test
+        fun `15,-,test,init`() {
+            report(test.initTest)
+        }
+
+        @Test
+        fun `15,-,live,init`() {
+            report(test.initLive)
+        }
+    }
+
+    @Nested
+    inner class `Part 1` {
+        @Test
+        fun `15,1,test`() {
+            report(test.testPart1)
+        }
+
+        @Test
+        fun `15,1,live,1`() {
+            report(test.livePart1)
+        }
+    }
+
+    @Nested
+    inner class `Part 2` {
+        @Test
+        fun `15,2,test`() {
+            report(test.testPart2)
+        }
+
+        @Test
+        fun `15,2,live,1`() {
+            report(test.livePart2)
+        }
+    }
+}