Day 02 2025 (#228)

src/main/kotlin/me/peckb/aoc/_2023/calendar/day02/Day02.kt

@@ -0,0 +1,69 @@
+package me.peckb.aoc._2023.calendar.day02
+
+import javax.inject.Inject
+
+import me.peckb.aoc.generators.InputGenerator.InputGeneratorFactory
+import kotlin.math.max
+
+class Day02 @Inject constructor(
+  private val generatorFactory: InputGeneratorFactory,
+) {
+  fun partOne(filename: String) = generatorFactory.forFile(filename).readAs(::game) { games ->
+    val maxRed = 12
+    val maxGreen = 13
+    val maxBlue = 14
+
+    games.filter { game ->
+      game.rounds.none { round ->
+        round.red > maxRed || round.blue > maxBlue || round.green > maxGreen
+      }
+    }.sumOf { it.id }
+  }
+
+  fun partTwo(filename: String) = generatorFactory.forFile(filename).readAs(::game) { games ->
+    games.sumOf { game ->
+      var minRequiredRed = 0
+      var minRequiredBlue = 0
+      var minRequiredGreen = 0
+
+      game.rounds.forEach { round ->
+        minRequiredRed = max(minRequiredRed, round.red)
+        minRequiredBlue = max(minRequiredBlue, round.blue)
+        minRequiredGreen = max(minRequiredGreen, round.green)
+      }
+
+      minRequiredRed * minRequiredGreen * minRequiredBlue
+    }
+  }
+
+  private fun game(line: String): Game {
+    val (gameIdString, roundData) = line.split(": ")
+    val id = gameIdString.split(" ").last().toInt()
+
+    val roundStrings = roundData.split("; ")
+
+    val rounds = roundStrings.map { roundInformation ->
+      var red = 0
+      var blue = 0
+      var green = 0
+
+      roundInformation.split(", ")
+        .forEach { colourInformation ->
+          val (count, colour) = colourInformation.split(" ")
+          when (colour) {
+            "red" -> red = count.toInt()
+            "blue" -> blue = count.toInt()
+            "green" -> green = count.toInt()
+          }
+        }
+
+      Round(red, green, blue)
+    }
+
+    return Game(id, rounds)
+  }
+
+  data class Game(val id: Int, val rounds: List<Round>)
+
+  data class Round(val red: Int, val green: Int, val blue: Int)
+}

src/main/kotlin/me/peckb/aoc/_2023/calendar/day02/README.md

@@ -0,0 +1 @@
+## [Day 2: Cube Conundrum](https://adventofcode.com/2023/day/2)

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

@@ -1,6 +1,7 @@
 package me.peckb.aoc._2023
 
 import dagger.Component
+import me.peckb.aoc._2023.calendar.day02.Day02Test
 import javax.inject.Singleton
 
 import me.peckb.aoc.DayComponent
@@ -11,4 +12,5 @@ import me.peckb.aoc._2023.calendar.day01.Day01Test
 @Component(modules = [InputModule::class])
 internal interface TestDayComponent : DayComponent {
   fun inject(day01Test: Day01Test)
+  fun inject(day02Test: Day02Test)
 }

src/test/kotlin/me/peckb/aoc/_2023/calendar/day02/Day02Test.kt

@@ -0,0 +1,33 @@
+package me.peckb.aoc._2023.calendar.day02
+
+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 Day02Test {
+  @Inject
+  lateinit var day02: Day02
+
+  @BeforeEach
+  fun setup() {
+    DaggerTestDayComponent.create().inject(this)
+  }
+
+  @Test
+  fun testDay02PartOne() {
+    assertEquals(2563, day02.partOne(DAY_02))
+  }
+
+  @Test
+  fun testDay02PartTwo() {
+    assertEquals(70768, day02.partTwo(DAY_02))
+  }
+
+  companion object {
+    private const val DAY_02: String = "advent-of-code-input/2023/day02.input"
+  }
+}