Day 01 2023 (#227)

src/main/kotlin/me/peckb/aoc/_2023/calendar/day01/Day01.kt

@@ -0,0 +1,80 @@
+package me.peckb.aoc._2023.calendar.day01
+
+import javax.inject.Inject
+
+import me.peckb.aoc.generators.InputGenerator.InputGeneratorFactory
+
+class Day01 @Inject constructor(
+  private val generatorFactory: InputGeneratorFactory,
+) {
+  fun partOne(filename: String) = generatorFactory.forFile(filename).read { input ->
+    input.map { lineFromFile ->
+      val digits = lineFromFile.mapNotNull { character ->
+        if (character.isDigit()) {
+          character.digitToInt()
+        } else {
+          null
+        }
+      }
+
+      val first = digits.first()
+      val last = digits.last()
+
+      "$first$last".toInt()
+    }.sum()
+  }
+
+  fun partTwo(filename: String) = generatorFactory.forFile(filename).read { input ->
+    input.map { lineFromFile ->
+      val first = listOf(
+        lineFromFile.indexOf("one") to 1,
+        lineFromFile.indexOf("two") to 2,
+        lineFromFile.indexOf("three") to 3,
+        lineFromFile.indexOf("four") to 4,
+        lineFromFile.indexOf("five") to 5,
+        lineFromFile.indexOf("six") to 6,
+        lineFromFile.indexOf("seven") to 7,
+        lineFromFile.indexOf("eight") to 8,
+        lineFromFile.indexOf("nine") to 9,
+
+        lineFromFile.indexOf('1') to 1,
+        lineFromFile.indexOf('2') to 2,
+        lineFromFile.indexOf('3') to 3,
+        lineFromFile.indexOf('4') to 4,
+        lineFromFile.indexOf('5') to 5,
+        lineFromFile.indexOf('6') to 6,
+        lineFromFile.indexOf('7') to 7,
+        lineFromFile.indexOf('8') to 8,
+        lineFromFile.indexOf('9') to 9,
+      ).sortedBy { (index, _) -> index }
+        .first { (index, _) -> index >= 0 }
+        .second
+
+      val last = listOf(
+        lineFromFile.lastIndexOf("one") to 1,
+        lineFromFile.lastIndexOf("two") to 2,
+        lineFromFile.lastIndexOf("three") to 3,
+        lineFromFile.lastIndexOf("four") to 4,
+        lineFromFile.lastIndexOf("five") to 5,
+        lineFromFile.lastIndexOf("six") to 6,
+        lineFromFile.lastIndexOf("seven") to 7,
+        lineFromFile.lastIndexOf("eight") to 8,
+        lineFromFile.lastIndexOf("nine") to 9,
+
+        lineFromFile.lastIndexOf('1') to 1,
+        lineFromFile.lastIndexOf('2') to 2,
+        lineFromFile.lastIndexOf('3') to 3,
+        lineFromFile.lastIndexOf('4') to 4,
+        lineFromFile.lastIndexOf('5') to 5,
+        lineFromFile.lastIndexOf('6') to 6,
+        lineFromFile.lastIndexOf('7') to 7,
+        lineFromFile.lastIndexOf('8') to 8,
+        lineFromFile.lastIndexOf('9') to 9,
+      ).sortedBy { (index, _) -> index }
+        .last { (index, _) -> index >= 0 }
+        .second
+
+      "$first$last".toInt()
+    }.sum()
+  }
+}

src/main/kotlin/me/peckb/aoc/_2023/calendar/day01/README.md

@@ -0,0 +1 @@
+## [Day 1: Trebuchet?!](https://adventofcode.com/2023/day/1)

src/test/kotlin/me/peckb/aoc/_2023/TestDayComponent.kt

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+package me.peckb.aoc._2023
+
+import dagger.Component
+import javax.inject.Singleton
+
+import me.peckb.aoc.DayComponent
+import me.peckb.aoc.InputModule
+import me.peckb.aoc._2023.calendar.day01.Day01Test
+
+@Singleton
+@Component(modules = [InputModule::class])
+internal interface TestDayComponent : DayComponent {
+  fun inject(day01Test: Day01Test)
+}

src/test/kotlin/me/peckb/aoc/_2023/calendar/day01/Day01Test.kt

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+package me.peckb.aoc._2023.calendar.day01
+
+import javax.inject.Inject
+
+
+import me.peckb.aoc._2023.DaggerTestDayComponent
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+internal class Day01Test {
+  @Inject
+  lateinit var day01: Day01
+
+  @BeforeEach
+  fun setup() {
+    DaggerTestDayComponent.create().inject(this)
+  }
+
+  @Test
+  fun testDay01PartOne() {
+    assertEquals(54667, day01.partOne(DAY_01))
+  }
+
+  @Test
+  fun testDay01PartTwo() {
+    assertEquals(54203, day01.partTwo(DAY_01))
+  }
+
+  companion object {
+    private const val DAY_01: String = "advent-of-code-input/2023/day01.input"
+  }
+}