Refactor day 2 of AoC 2023

advent-of-code/2023/day_02/.gitignore

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+.gradle
+gradle
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Kotlin ###
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

advent-of-code/2023/day_02/README.md

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+# Advent of Code 2023 day 2 solution in Kotlin
+
+## Cube Conundrum
+
+[Task page](https://adventofcode.com/2023/day/2)
+
+You're launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a
+large island floating in the sky. You gently land in a fluffy pile of leaves.
+It's quite cold, but you don't see much snow. An Elf runs over to greet you.
+
+The Elf explains that you've arrived at Snow Island and apologizes for the lack of snow.
+He'll be happy to explain the situation, but it's a bit of a walk, so you have some time.
+They don't get many visitors up here; would you like to play a game in the meantime?
+
+As you walk, the Elf shows you a small bag and some cubes which are either red, green, or blue.
+Each time you play this game, he will hide a secret number of cubes of each color in the bag,
+and your goal is to figure out information about the number of cubes.
+
+To get information, once a bag has been loaded with cubes, the Elf will reach into the bag,
+grab a handful of random cubes, show them to you, and then put them back in the bag. He'll do this a few times per game.
+
+You play several games and record the information from each game (your puzzle input).
+Each game is listed with its ID number (like the 11 in Game 11: ...) followed by a semicolon-separated
+list of subsets of cubes that were revealed from the bag (like 3 red, 5 green, 4 blue).
+
+For example, the record of a few games might look like this:
+
+```
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+```
+
+In game 1, three sets of cubes are revealed from the bag (and then put back again).
+The first set is 3 blue cubes and 4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes;
+the third set is only 2 green cubes.
+
+The Elf would first like to know which games would have been possible if the bag contained only 12 red cubes,
+13 green cubes, and 14 blue cubes?
+
+In the example above, games 1, 2, and 5 would have been possible if the bag had been loaded with that configuration.
+However, game 3 would have been impossible because at one point the Elf showed you 20 red cubes at once; similarly,
+game 4 would also have been impossible because the Elf showed you 15 blue cubes at once.
+If you add up the IDs of the games that would have been possible, you get 8.
+
+Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes,
+and 14 blue cubes. What is the sum of the IDs of those games?
+
+
+## Part Two
+
+The Elf says they've stopped producing snow because they aren't getting any water!
+He isn't sure why the water stopped; however, he can show you how to get to the water source
+to check it out for yourself. It's just up ahead!
+
+As you continue your walk, the Elf poses a second question: in each game you played,
+what is the fewest number of cubes of each color that could have been in the bag to make the game possible?
+
+Again consider the example games from earlier:
+
+```
+Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
+```
+
+- In game 1, the game could have been played with as few as 4 red, 2 green, and 6 blue cubes. If any color had even one fewer cube, the game would have been impossible.
+- Game 2 could have been played with a minimum of 1 red, 3 green, and 4 blue cubes.
+- Game 3 must have been played with at least 20 red, 13 green, and 6 blue cubes.
+- Game 4 required at least 14 red, 3 green, and 15 blue cubes.
+- Game 5 needed no fewer than 6 red, 3 green, and 2 blue cubes in the bag.
+
+The power of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied together.
+The power of the minimum set of cubes in game 1 is 48. In games 2-5 it was 12, 1560, 630, and 36, respectively.
+Adding up these five powers produces the sum 2286.
+
+For each game, find the minimum set of cubes that must have been present. What is the sum of the power of these sets?

advent-of-code/2023/day_02/build.gradle.kts

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+plugins {
+    kotlin("jvm") version "2.0.21"
+}
+
+group = "space.comfycamp"
+version = "1.0"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

advent-of-code/2023/day_02/gradle.properties

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+kotlin.code.style=official

advent-of-code/2023/day_02/settings.gradle.kts

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+rootProject.name = "day_02"
+

advent-of-code/2023/day_02/src/main/kotlin/GameHost.kt

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+package space.comfycamp
+
+import kotlin.math.max
+
+data class CubeSet(var red: Int, var green: Int, var blue: Int)
+
+// Part 1
+fun getSumOfCorrectGameIDs(text: List<String>): Int {
+    val games = readGames(text)
+
+    return games
+        .withIndex()
+        .filter{ el -> isGameValid(el.value) }
+        .sumOf { el -> el.index + 1 }
+}
+
+private fun isGameValid(cubeSets: List<CubeSet>): Boolean {
+    for (cubeSet in cubeSets) {
+        if (cubeSet.red > 12 || cubeSet.green > 13 || cubeSet.blue > 14) {
+            return false
+        }
+    }
+
+    return true
+}
+
+// Part 2
+fun getSumOfPowers(text: List<String>): Int {
+    val games = readGames(text)
+
+    return games
+        .map { game ->
+            game.reduce { acc, cubeSet ->
+                CubeSet(
+                    max(acc.red, cubeSet.red),
+                    max(acc.green, cubeSet.green),
+                    max(acc.blue, cubeSet.blue)
+                )
+            }
+        }
+        .sumOf { cubeSet -> cubeSet.red * cubeSet.green * cubeSet.blue }
+}
+
+private fun readGames(text: List<String>): List<List<CubeSet>> {
+    return text
+        .map{ line -> line.split(": ")[1] }
+        .map{ sets -> sets.split("; ").map{ cubeSet -> parseCubeSet(cubeSet) } }
+}
+
+private fun parseCubeSet(description: String): CubeSet {
+    val cubeSet = CubeSet(0,0,0)
+    for (cubeStr in description.split(", ")) {
+        val (cubeCountStr, color) = cubeStr.split(" ")
+        when (color) {
+            "blue" -> cubeSet.blue = cubeCountStr.toInt()
+            "red" -> cubeSet.red = cubeCountStr.toInt()
+            "green" -> cubeSet.green = cubeCountStr.toInt()
+        }
+    }
+    return cubeSet
+}

advent-of-code/2023/day_02/src/main/kotlin/Main.kt

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+package space.comfycamp
+
+fun main() {
+    val resource = object{}.javaClass.getResource("/input.txt")!!
+    val lines = resource.readText().trim().lines()
+
+    val res1 = getSumOfCorrectGameIDs(lines)
+    println("Part 1: $res1")
+
+    val res2 = getSumOfPowers(lines)
+    println("Part 2: $res2")
+}

advent-of-code/2023/day_02/src/test/kotlin/GameHostTest.kt

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+import space.comfycamp.getSumOfCorrectGameIDs
+import space.comfycamp.getSumOfPowers
+import kotlin.test.assertEquals
+import kotlin.test.Test
+
+class GameHostTest {
+    @Test
+    fun testGetSumOfCorrectGameIDs() {
+        val lines = listOf(
+            "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+            "Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue",
+            "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red",
+            "Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red",
+            "Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green"
+        )
+        assertEquals(8, getSumOfCorrectGameIDs(lines))
+    }
+
+    @Test
+    fun testGetSumOfPowers() {
+        val lines = listOf(
+            "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green",
+            "Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue",
+            "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red",
+            "Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red",
+            "Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green"
+        )
+        assertEquals(2286, getSumOfPowers(lines))
+    }
+}

advent-of-code/2023/kotlin/src/main/kotlin/Solution02.kt

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-import kotlin.math.max
-
-class CubeCount(var red: Int, var green: Int, var blue: Int) {
-    fun lessOrEqualThan(other: CubeCount): Boolean {
-        return red <= other.red && green <= other.green && blue <= other.blue
-    }
-}
-
-class Solution02 {
-    // Part 1
-    fun getSumOfCorrectGameIDs(text: List<String>, cubes: CubeCount): Int {
-        val games = readGames(text)
-        var sum = 0
-
-        for (game in games.entries) {
-            var valid = true
-
-            for (count in game.value) {
-                if (!count.lessOrEqualThan(cubes)) {
-                    valid = false
-                }
-            }
-
-            if (valid) {
-                sum += game.key
-            }
-        }
-
-        return sum
-    }
-
-    // Part 2
-    fun getSumOfPowers(text: List<String>): Int {
-        val games = readGames(text)
-        var sum = 0
-
-        for (game in games.values) {
-            var maxRed = 0
-            var maxGreen = 0
-            var maxBlue = 0
-
-            for (gameSet in game) {
-                maxRed = max(maxRed, gameSet.red)
-                maxGreen = max(maxGreen, gameSet.green)
-                maxBlue = max(maxBlue, gameSet.blue)
-            }
-
-            sum += maxRed * maxGreen * maxBlue
-        }
-
-        return sum
-    }
-
-    private fun readGames(text: List<String>): HashMap<Int, MutableList<CubeCount>> {
-        val games = hashMapOf<Int, MutableList<CubeCount>>()
-
-        text.forEach {
-            // `it` example: "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green"
-            val (game, sets) = it.split(": ")
-            val gameID = game.split(" ")[1].toInt()
-            games[gameID] = arrayListOf()
-
-            // setStr example: "3 blue, 4 red"
-            for (setStr in sets.split("; ")) {
-                val gameSet = CubeCount(0,0,0)
-                // cubeStr example: "3 blue"
-                for (cubeStr in setStr.split(", ")) {
-                    val (cubeCountStr, color) = cubeStr.split(" ")
-                    when (color) {
-                        "blue" -> gameSet.blue = cubeCountStr.toInt()
-                        "red" -> gameSet.red = cubeCountStr.toInt()
-                        "green" -> gameSet.green = cubeCountStr.toInt()
-                    }
-                }
-                games[gameID]?.add(gameSet)
-            }
-        }
-
-        return games
-    }
-}

advent-of-code/2023/kotlin/src/main/resources/day-02/test.txt

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-Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
-Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
-Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
-Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
-Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green

advent-of-code/2023/kotlin/src/test/kotlin/Solution02Test.kt

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-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-class Solution02Test {
-    @Test
-    fun testGetSumOfCorrectGameIDs() {
-        val text = ResourceReader().readFile("day-02/test.txt")
-        val res = Solution02().getSumOfCorrectGameIDs(text, CubeCount(12, 13, 14))
-        assertEquals(8, res)
-    }
-
-    @Test
-    fun testGetPowerSum() {
-        val text = ResourceReader().readFile("day-02/test.txt")
-        val res = Solution02().getSumOfPowers(text)
-        assertEquals(2286, res)
-    }
-
-    @Test
-    fun solvePart1() {
-        val text = ResourceReader().readFile("day-02/input.txt")
-        val res = Solution02().getSumOfCorrectGameIDs(text, CubeCount(12, 13, 14))
-        println(res)
-    }
-
-    @Test
-    fun solvePart2() {
-        val text = ResourceReader().readFile("day-02/input.txt")
-        val res = Solution02().getSumOfPowers(text)
-        println(res)
-    }
-}