Day 3: Testfile works.. answer still wrong :-(

src/main/kotlin/Main.kt

@@ -1,5 +1,14 @@
 import day1.Day1
+import day2.Day2
+import day2.Hand
+import day3.Day3
 
 fun main() {
-    println("Day 1: ${Day1.answerOne()} &&  ${Day1.answerTwo()}")
+    println("Day 1-1: ${Day1.answerOne()}")
+    println("Day 1-2: ${Day1.answerTwo()}")
+    println("Day 2-1: ${Day2.sumOfCompatibleGames("src/main/resources/day2/input.txt", Hand(12,13,14))}")
+    println("Day 2-2: ${Day2.powerOfMinimumSetOfCubes("src/main/resources/day2/input.txt")}")
+    println("Day 3-1: ${Day3.sumOfSelectedParts("src/main/resources/day3/input.txt")}")
+
+
 }

src/main/kotlin/day2/Day2.kt

@@ -4,13 +4,37 @@ import java.io.File
 
 object Day2 {
 
-    fun readGames(file: File = File("src/main/resources/day2/input.txt")): List<Game> = file
+    fun sumOfCompatibleGames(file: String, hand: Hand) = readGames(file)
+        .filter { it.isCompatibleWith(hand) }
+        .map(Game::id)
+        .sum()
+
+    fun powerOfMinimumSetOfCubes(file: String) = readGames(file)
+        .map(Game::powerOfHands)
+        .sum()
+
+    private fun readGames(file: String): List<Game> =
+        File(file)
             .readLines()
             .map(Game.Companion::parse)
 
 }
 
 data class Game(val id: Int, val hands: List<Hand>) {
+
+    fun isCompatibleWith(hand: Hand) =
+        hand.fitsIn(maxOfHands())
+
+    fun powerOfHands() = maxOfHands().let { it.red * it.green * it.blue }
+
+    private fun maxOfHands() = hands.fold(Hand(0, 0, 0)) { currentMax: Hand, next: Hand ->
+        Hand(
+            maxOf(currentMax.red, next.red),
+            maxOf(currentMax.green, next.green),
+            maxOf(currentMax.blue, next.blue)
+        )
+    }
+
     companion object {
 
         /**
@@ -25,11 +49,13 @@ data class Game(val id: Int, val hands: List<Hand>) {
             }
 
 
-        private val NUMBER_REGEX = Regex("\\d")
+        private val NUMBER_REGEX = Regex("\\d+")
     }
 }
 
 data class Hand(val red: Int, val green: Int, val blue: Int) {
+    fun fitsIn(other: Hand) = red >= other.red && green >= other.green && blue >= other.blue
+
     companion object {
 
         /**

src/main/kotlin/day3/Day3.kt

@@ -0,0 +1,63 @@
+package day3
+
+import java.io.File
+
+object Day3 {
+
+    fun sumOfSelectedParts(file: String): Int =
+        readLines(file)
+            .let { lines ->
+                readParts(lines)
+                    .filter { parts -> parts.isSelected(lines) }
+            }
+            .sumOf { it.number }
+
+    fun readLines(file: String): List<String> =
+        File(file)
+            .readLines()
+
+    fun readParts(lines: List<String>): List<Part> =
+        lines
+            .flatMapIndexed<String, Part> { y, line ->
+                line.foldIndexed(mutableListOf()) { x, parts, character ->
+                    when {
+                        character.isDigit() ->
+                            if (parts.lastOrNull()?.isIn(x, y) != true) {
+                                val number = STARTING_NUMBERS_REGEX.find(line.substring(x))!!.value
+                                parts.addLast(
+                                    Part(
+                                        number.toInt(),
+                                        Coordinate(x, y),
+                                        Coordinate(x + number.length - 1, y)
+                                    )
+                                )
+                            }
+                    }
+                    parts
+                }
+            }
+
+    private val STARTING_NUMBERS_REGEX = Regex("""^\d+""")
+}
+
+data class Part(val number: Int, val from: Coordinate, val to: Coordinate) {
+    fun isIn(x: Int, y: Int): Boolean =
+        x >= from.x
+                && x <= to.x
+                && y >= from.y
+                && y <= to.y
+
+    fun isSelected(engine: List<String>) =
+        engine.hasSymbols(from.x - 1, from.y - 1, to.x - from.x + 1 + 2) // above
+                || engine.hasSymbols(from.x - 1, from.y + 1, to.x - from.x + 2) // below
+                || engine.hasSymbols(from.x - 1, from.y, 1) // left
+                || engine.hasSymbols(to.x + 1, from.y, 1) // right
+
+}
+
+private fun List<String>.hasSymbols(x: Int, y: Int, length: Int) =
+    y > 0 && y < size - 1 && this[y].let { it.substring(maxOf(0, x), minOf(it.length, maxOf(0, x) + length)) }
+        .any { !(it.isDigit() || it == '.') }
+
+
+data class Coordinate(val x: Int, val y: Int)

src/main/resources/day2/input.txt

@@ -1,5 +1,100 @@
-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
+Game 1: 1 green, 2 red, 6 blue; 4 red, 1 green, 3 blue; 7 blue, 5 green; 6 blue, 2 red, 1 green
+Game 2: 1 green, 17 red; 1 blue, 6 red, 7 green; 2 blue, 4 red, 7 green; 1 green, 6 red, 2 blue
+Game 3: 6 red, 15 blue, 15 green; 1 green, 4 red, 12 blue; 14 blue, 9 red, 1 green; 2 red, 15 blue, 12 green
+Game 4: 8 green, 10 blue, 6 red; 20 blue, 4 red; 17 blue, 2 green, 3 red; 4 blue, 2 green, 3 red; 10 red, 3 blue, 3 green; 5 green, 14 blue, 6 red
+Game 5: 3 green, 8 blue, 2 red; 11 red, 6 green, 11 blue; 8 red, 5 blue, 2 green
+Game 6: 2 blue, 12 red, 2 green; 3 green, 2 red; 3 green, 3 blue, 10 red; 7 red, 2 blue, 4 green; 1 red, 2 blue, 5 green
+Game 7: 1 red, 8 blue, 2 green; 1 red, 2 blue, 12 green; 1 blue; 3 blue, 3 green
+Game 8: 10 green, 4 red, 4 blue; 12 green, 1 blue; 1 red, 13 green, 2 blue; 12 green, 3 blue; 9 green, 7 red
+Game 9: 1 green, 1 blue, 3 red; 3 blue, 3 red, 8 green; 6 blue, 4 red, 6 green; 2 red, 7 green; 1 red, 10 green, 13 blue; 5 red, 1 blue, 1 green
+Game 10: 9 green, 3 red, 3 blue; 12 green, 2 blue; 18 green, 1 blue; 14 green; 2 blue, 9 green, 2 red
+Game 11: 14 green; 2 green, 2 red, 11 blue; 9 blue, 3 green
+Game 12: 9 green, 3 blue, 8 red; 1 green, 2 blue, 3 red; 4 blue, 8 red, 10 green; 3 blue, 7 red, 8 green; 3 blue, 5 red, 7 green; 2 blue, 5 green
+Game 13: 6 red, 1 blue, 10 green; 7 red, 1 green; 8 red, 2 green, 1 blue
+Game 14: 2 red, 4 blue, 2 green; 2 green, 5 red, 1 blue; 1 red, 6 blue
+Game 15: 7 blue, 3 red; 13 blue, 8 red, 1 green; 1 green, 5 red, 13 blue; 8 red, 5 blue; 4 red, 3 blue, 1 green; 12 blue, 8 red, 1 green
+Game 16: 5 blue, 1 green, 2 red; 2 blue, 20 green; 4 blue, 1 red, 17 green; 10 green, 5 blue, 2 red
+Game 17: 6 red, 13 blue, 8 green; 12 blue, 7 green, 9 red; 19 blue, 5 red; 2 green, 8 red, 14 blue
+Game 18: 5 red, 2 green, 1 blue; 8 blue, 17 red, 9 green; 2 blue, 1 green; 4 blue, 10 red; 5 blue, 4 red, 6 green
+Game 19: 5 red, 12 green; 8 red, 13 green, 1 blue; 1 red, 1 green, 3 blue; 5 green, 5 red
+Game 20: 11 red, 8 blue; 9 red, 2 green, 13 blue; 2 red, 1 green, 2 blue; 1 green, 9 blue, 13 red; 3 blue, 5 red, 1 green
+Game 21: 1 red, 4 green, 11 blue; 3 green, 15 blue; 6 green, 7 red, 14 blue; 15 blue, 6 green, 10 red; 6 red, 16 blue, 2 green
+Game 22: 2 blue, 15 green, 2 red; 3 blue, 6 green, 1 red; 2 blue, 5 green, 1 red; 6 green, 2 red, 2 blue; 4 green, 2 blue; 4 blue, 1 red, 15 green
+Game 23: 2 blue, 1 green, 12 red; 5 blue, 11 red, 4 green; 12 red, 4 blue; 12 red, 2 green, 5 blue
+Game 24: 4 blue, 7 red; 3 red, 3 blue; 1 red, 4 blue; 2 green, 6 red, 6 blue; 7 red, 1 green, 2 blue; 6 red, 1 blue, 1 green
+Game 25: 5 green, 9 blue; 6 green, 7 red, 2 blue; 1 red, 3 blue, 7 green; 9 blue, 3 red; 5 green, 9 blue, 2 red
+Game 26: 6 red, 4 blue; 2 blue, 4 green; 3 green, 5 red, 5 blue; 4 green, 6 red, 3 blue; 4 green, 7 red, 4 blue
+Game 27: 15 green, 1 blue, 12 red; 12 red, 1 green; 1 red, 1 blue, 5 green; 13 green, 6 red, 1 blue; 5 red, 1 blue, 1 green; 11 red, 14 green
+Game 28: 3 blue, 2 green, 10 red; 5 blue, 2 green; 4 green, 3 blue, 11 red
+Game 29: 10 blue, 2 red; 17 green, 7 blue, 2 red; 1 blue, 8 green, 1 red; 10 green, 2 red, 3 blue
+Game 30: 10 green, 8 red, 1 blue; 4 blue, 7 green, 14 red; 2 blue, 14 red, 11 green; 1 blue, 13 green, 12 red; 5 blue, 2 red, 4 green; 4 green, 5 red
+Game 31: 4 green, 11 red, 11 blue; 3 blue, 11 red; 5 blue, 7 red, 3 green; 10 blue, 5 green, 1 red
+Game 32: 4 red, 8 blue, 1 green; 14 red, 7 blue, 4 green; 13 red, 3 blue, 9 green; 3 red, 1 green, 8 blue; 8 green, 8 red, 5 blue
+Game 33: 6 red, 10 blue, 7 green; 19 blue, 1 red; 6 green, 11 red, 11 blue; 2 green, 2 blue, 12 red; 3 red, 13 blue, 7 green; 6 green, 4 red, 2 blue
+Game 34: 3 red, 3 green, 15 blue; 7 green, 15 blue; 3 red, 2 green, 8 blue; 19 green, 18 blue
+Game 35: 2 green, 1 blue; 2 green, 2 blue, 1 red; 3 blue, 1 red, 1 green; 4 blue, 1 red
+Game 36: 1 red, 11 green; 1 green, 1 blue; 8 blue; 2 green, 3 red; 1 red
+Game 37: 4 blue, 3 red; 12 blue, 13 red; 2 red, 2 green, 8 blue
+Game 38: 8 red, 2 blue; 1 green, 2 red; 8 red, 2 green, 1 blue; 16 red, 2 green; 7 red, 2 blue, 2 green
+Game 39: 6 green, 1 blue, 5 red; 14 green, 8 blue, 6 red; 8 red, 10 blue, 1 green; 14 green, 9 red; 17 blue, 5 red; 1 blue, 7 green, 1 red
+Game 40: 4 red, 8 blue, 3 green; 13 blue, 1 red; 3 blue, 7 red, 3 green; 3 green, 8 blue, 10 red; 3 green, 20 blue, 5 red
+Game 41: 1 blue, 2 green; 11 green, 2 blue; 5 blue; 15 red, 8 green, 5 blue
+Game 42: 1 green, 12 blue, 1 red; 6 blue, 1 green, 5 red; 1 red, 11 blue, 4 green; 3 red, 17 blue, 1 green; 1 red, 11 blue; 9 blue, 6 green, 3 red
+Game 43: 16 blue, 13 green, 1 red; 17 blue, 7 red, 10 green; 13 green, 5 red, 7 blue
+Game 44: 2 blue, 4 red; 15 green, 7 red; 2 green, 1 blue; 6 red, 13 green
+Game 45: 5 green, 1 blue, 8 red; 4 red, 1 blue, 5 green; 1 green, 3 red; 1 green, 2 blue, 6 red; 4 red, 3 green, 2 blue; 2 red, 2 blue, 5 green
+Game 46: 1 green, 1 red, 6 blue; 11 blue; 1 red, 1 green, 7 blue; 8 blue; 1 green, 7 blue, 2 red
+Game 47: 7 green, 9 blue, 7 red; 11 red, 13 blue, 5 green; 12 green, 12 blue, 5 red; 4 blue, 8 green, 7 red
+Game 48: 11 green, 7 red, 2 blue; 2 blue, 10 green, 3 red; 1 blue, 2 red, 1 green; 4 green, 2 red, 7 blue; 7 red, 4 green, 2 blue
+Game 49: 1 red, 2 blue, 5 green; 2 green, 4 blue; 5 blue, 2 green, 1 red; 9 blue, 1 green; 7 blue
+Game 50: 8 green, 9 blue, 2 red; 2 green, 5 blue; 14 green, 1 red, 8 blue
+Game 51: 1 green, 2 blue; 12 blue, 1 red; 2 blue
+Game 52: 3 red, 2 blue, 2 green; 4 red, 4 green, 7 blue; 2 blue, 4 red, 1 green; 3 green; 1 red, 9 green, 7 blue
+Game 53: 9 blue, 12 red, 7 green; 8 blue, 6 green; 1 green, 8 blue, 9 red; 12 red, 6 green; 9 blue, 14 red, 10 green; 7 red, 3 green, 5 blue
+Game 54: 8 green, 5 blue, 5 red; 4 green, 13 blue, 2 red; 2 blue, 5 red, 1 green; 3 red, 3 green, 10 blue
+Game 55: 17 red, 15 green, 17 blue; 6 red, 5 green, 7 blue; 17 green, 6 blue, 5 red
+Game 56: 7 blue, 6 red, 7 green; 10 green, 3 red; 9 red, 3 blue, 5 green
+Game 57: 5 blue, 11 red, 1 green; 13 red, 1 green, 2 blue; 2 blue, 4 red; 1 green, 10 red, 1 blue; 1 green, 8 red
+Game 58: 1 red, 2 green, 9 blue; 1 green, 1 blue, 1 red; 2 red, 6 blue, 2 green; 14 blue, 1 green, 1 red; 5 blue, 1 red, 2 green; 14 blue, 2 green
+Game 59: 9 green, 2 blue, 5 red; 9 red, 5 green; 10 red, 1 blue, 8 green
+Game 60: 8 blue, 6 red, 4 green; 3 red, 12 green, 9 blue; 4 blue, 5 red, 5 green; 4 red, 8 blue; 7 green, 12 blue, 6 red
+Game 61: 5 blue, 13 red, 1 green; 5 red, 5 blue; 1 red, 3 blue; 1 green, 9 red; 10 red, 3 blue, 1 green
+Game 62: 1 blue, 13 red; 4 blue, 5 red; 11 blue, 8 red, 1 green
+Game 63: 14 blue, 5 red; 9 blue, 14 green, 5 red; 3 red, 8 green, 15 blue; 4 blue, 15 green, 6 red
+Game 64: 13 red, 6 blue, 11 green; 12 red, 1 blue, 8 green; 1 red, 17 green; 13 red, 12 green, 7 blue
+Game 65: 4 red, 17 blue, 3 green; 2 green, 12 blue, 9 red; 2 green, 17 blue, 5 red; 1 red, 1 green, 4 blue; 9 red, 16 blue; 7 blue, 9 red
+Game 66: 10 blue, 10 green, 5 red; 10 green, 3 blue, 5 red; 1 red, 1 green, 10 blue; 2 green, 5 red, 20 blue; 8 blue, 11 green, 13 red; 2 green, 18 blue, 2 red
+Game 67: 6 red, 1 green; 5 red, 10 blue; 6 blue, 6 red
+Game 68: 4 green, 1 red, 5 blue; 5 red, 5 blue; 7 red, 6 green; 8 red, 1 blue
+Game 69: 2 blue, 11 red; 4 red, 6 green, 1 blue; 4 red, 1 blue, 14 green
+Game 70: 15 red, 8 blue, 5 green; 5 green, 2 red, 8 blue; 8 red, 3 green, 10 blue
+Game 71: 4 blue, 2 red; 12 green, 4 blue; 10 green
+Game 72: 3 blue, 4 green, 6 red; 6 red, 5 green, 8 blue; 10 red, 6 green, 5 blue; 1 green, 2 blue; 10 red, 5 blue, 4 green
+Game 73: 5 blue, 1 red; 1 green, 11 blue; 10 blue; 12 blue, 1 red; 1 red, 9 blue; 7 blue, 1 green, 1 red
+Game 74: 7 green, 6 blue, 7 red; 7 blue, 6 green, 15 red; 7 red, 5 blue, 1 green; 1 blue, 6 red, 8 green; 8 green, 14 red, 3 blue
+Game 75: 8 green, 3 red, 3 blue; 1 blue, 6 red, 7 green; 9 green, 3 blue; 3 blue, 9 green, 6 red; 4 blue, 1 red, 3 green; 4 green, 1 blue, 16 red
+Game 76: 4 blue, 3 green; 2 blue, 1 red, 6 green; 12 blue; 1 green, 14 blue
+Game 77: 5 green, 10 red, 11 blue; 3 red; 8 green, 6 red, 9 blue
+Game 78: 7 red, 7 green; 8 blue; 6 green, 7 red, 5 blue
+Game 79: 11 blue, 2 red, 4 green; 2 green, 3 red, 15 blue; 1 green, 15 blue, 1 red
+Game 80: 3 red, 17 green, 8 blue; 8 green, 10 blue; 4 green, 1 red, 14 blue
+Game 81: 17 green, 10 red, 10 blue; 9 green, 9 blue, 7 red; 11 red, 11 green, 4 blue; 15 blue, 5 red; 11 blue, 8 green, 15 red; 3 green, 16 red
+Game 82: 8 green, 9 blue, 1 red; 1 red, 8 green, 9 blue; 2 green, 12 blue
+Game 83: 2 green, 11 red, 20 blue; 20 blue, 1 green, 4 red; 2 green, 6 red, 20 blue; 17 blue, 10 red
+Game 84: 1 green, 9 red; 4 blue, 4 green; 1 green, 6 red, 14 blue
+Game 85: 5 red, 10 green, 9 blue; 8 blue, 3 green, 2 red; 4 blue, 14 green, 3 red; 5 red, 4 blue
+Game 86: 8 blue, 9 green, 5 red; 5 red, 10 green, 1 blue; 15 blue, 1 red, 2 green; 8 red, 8 blue, 10 green
+Game 87: 13 green, 2 red, 4 blue; 3 red, 11 green, 9 blue; 6 blue, 3 red, 12 green
+Game 88: 2 red, 7 blue, 3 green; 2 blue, 9 red; 9 red, 6 blue, 7 green; 6 green, 13 blue, 9 red; 6 green, 2 red, 15 blue; 1 red, 8 green, 7 blue
+Game 89: 11 red, 1 blue, 2 green; 6 blue, 5 green, 4 red; 15 red, 4 green, 5 blue; 11 red, 3 blue, 10 green; 6 blue, 13 green, 12 red
+Game 90: 2 red, 2 blue, 4 green; 2 red, 2 blue; 9 green, 1 red, 1 blue; 5 green, 1 red; 7 green, 2 red; 2 green, 1 blue
+Game 91: 5 blue, 3 red, 1 green; 1 red, 4 blue, 6 green; 6 blue, 6 green, 5 red
+Game 92: 16 green, 1 blue, 12 red; 18 green, 14 red, 1 blue; 16 red, 1 green; 4 blue, 16 red, 18 green
+Game 93: 9 red, 8 blue, 14 green; 1 blue, 1 green, 6 red; 4 blue, 4 red, 14 green
+Game 94: 11 green, 4 blue, 2 red; 1 red, 1 green, 1 blue; 4 red, 1 blue, 2 green
+Game 95: 5 blue, 2 red, 9 green; 5 blue, 8 green; 1 green, 15 blue; 5 red, 9 green, 5 blue; 3 green, 17 blue, 5 red
+Game 96: 2 green, 14 blue, 1 red; 3 green, 3 red, 14 blue; 2 red, 2 green, 13 blue
+Game 97: 2 green, 2 red; 2 blue, 1 green; 7 blue, 3 red
+Game 98: 2 red, 1 blue, 12 green; 2 blue, 10 green, 5 red; 11 green, 9 blue; 6 blue, 17 green; 7 blue, 9 green, 9 red; 1 red, 11 green, 9 blue
+Game 99: 2 green, 9 red, 1 blue; 3 green, 1 blue, 14 red; 5 green, 6 blue; 1 blue, 2 green, 3 red; 4 blue, 10 red, 1 green
+Game 100: 4 green, 4 blue, 15 red; 3 green, 1 red, 13 blue; 5 green, 5 blue, 10 red

src/main/resources/day3/README.md

@@ -0,0 +1,30 @@
+--- Day 3: Gear Ratios ---
+
+You and the Elf eventually reach a gondola lift station; he says the gondola lift will take you up to the water source, but this is as far as he can bring you. You go inside.
+
+It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
+
+"Aaah!"
+
+You turn around to see a slightly-greasy Elf with a wrench and a look of surprise. "Sorry, I wasn't expecting anyone! The gondola lift isn't working right now; it'll still be a while before I can fix it." You offer to help.
+
+The engineer explains that an engine part seems to be missing from the engine, but nobody can figure out which one. If you can add up all the part numbers in the engine schematic, it should be easy to work out which part is missing.
+
+The engine schematic (your puzzle input) consists of a visual representation of the engine. There are lots of numbers and symbols you don't really understand, but apparently any number adjacent to a symbol, even diagonally, is a "part number" and should be included in your sum. (Periods (.) do not count as a symbol.)
+
+Here is an example engine schematic:
+
+    467..114..
+    ...*......
+    ..35..633.
+    ......#...
+    617*......
+    .....+.58.
+    ..592.....
+    ......755.
+    ...$.*....
+    .664.598..
+
+In this schematic, two numbers are not part numbers because they are not adjacent to a symbol: 114 (top right) and 58 (middle right). Every other number is adjacent to a symbol and so is a part number; their sum is 4361.
+
+Of course, the actual engine schematic is much larger. What is the sum of all of the part numbers in the engine schematic?

src/main/resources/day3/input.txt

@@ -0,0 +1,140 @@
+..224.....487...................718.....................378............................................284........310......313..........311.
+....*..............................*744....486*485......*......741......@...359.#666...439................*925....*......$..+........@......
+.235................758..440...........................251....*......262.....*..........*......................752......774.......515.......
+.........705%..@746........+..942*591.347.470...#..257.........637...........793.......299..../.....813....509......464......&.........688..
+.....82................................*.../..901.....*..................836.....&............814...*........*..............80...17*....*...
+.../...*...679.661.....299...........222.............875.....213...161............964...894.........998.....310....258.85...........735.586.
+.650..23..#......*.......................................760*........@./........................202...................*.....339.............
+..............598......#.....536....702*.........705..........793......957............./........*...935...........965.......................
+..................*.357...+.....@.......242.......*......283..*...=956.......118.......959...184...*..............*....401*527.....348...161
+.63=...955.523..77......978.846....849..........699..........790........=911.*.....87...............486.........914..............=..........
+.........*.........842......*.......*..................*127....................844...*....946.......................235...209@...710.735....
+...........@.........*.....144....226....298........560.....253.........431......*...586.......723..../...482.......&...................*...
+...........871../918........................+....................329*......%.....906.............*...350.....@...............365.......361..
+......................536............................+..793..........664.....739................507......289.....256%...73..*...............
+.356..834..............*.........96.939..............28.+....=..............*...........................*................$.553..........526.
+...*...*.............501..746....*..-.......=.................890.....+...701..............807........447......97$..%...........58......$...
+.891....346...699...........*.421......+....666......198*791......340.433............#...%...*.......................316........*.....%.....
+..............%........81.984...........462....................../..........116...711....963...$................380.......745...85....224...
+.........370......923..@.....................563...........188+.........326*...................67.815..............*582.....................
+.........*........-........#530.........489........59...................................................#.....57.........100.*.......441*161
+.637*....961...........118...........21*...........@..216+.........................+....432*.*309..64....992.......81......=.781.644........
+.....324.........126......*166...............&...................385*..............233............*................*..436...........*517....
+.88*.........390*................355..335...372....+254..............294...$589........&..803/.....38..-...........56..$....................
+....235.-.........+196...948....*........-................359.........................398.............608..../.................145..346.....
+........915.................-.485.945.................936*................114.............118...............490.536..............*.%........
+.663........61.......856..........+....343....859...............*345.......*...=862............711.............................313.....606..
+........23...$.....@..................*......................316.....529.362.............49......................307*791....................
+225...............281...#..222.....@..283..............675............*.........911*90..-.....914..%39....509...............................
+.......797*....$........23..../...895.............67.......164.896.....554.....................*............=..............460........181...
+...........211.474...............................@...........*....*201..........911.717.#....192.75..679...........$.........*.........=....
+....355.........................&.....................678.650......................*.....128.....*.....*.........925..230...105.............
+....*.......409#.......*897.....698....427.........+....*.......*...............................313...670..521.......*....&.............*308
+...838..335.................367........-..........325....233...224...950......688.....199.774.........................793.108........501....
+...........*..102..924.349...+..595....................................*................&..............395+.....................753.........
+.........318...*......*........*....676...759.154...................524...........908.........694.211................173...........*214..424
+....458........403...........958.98....*........*..............688......957...488..+...........*.../....................................*...
+.......*.............591...............218.....203.....196$.......+....*........*......................765......971......./....927*741..227.
+......592..%60.$.....*.....885/....287...............................474.........409......226.174.......@........*.....230..................
+...............162.169.................510..962..............17......................32@..*...*.................225....................-....
+.....880...................201.....823*........*...914.724.........89...&.......267=.....717.54.436..........60...............&.........69..
+710........601....306.287.....+.........65...308....&...=.../......*.....926..................................*........278.415......-.......
+..............*..*......&..........241.%...................827../.265.............662.678......@...#......@.....$......-............734.144.
+.............424..434.....701.....*........380*731.............24.................*...&........973..741....728..357.........................
+........304.................*...881................238.....740.........947........587...22...........................271*........603....@...
+...................266.....918....................*..........+.519.617..*...826..........*............./268..974.........486.376....*.295...
+...939.........363.*...............378..........302....586........*....740...=..........380........931...........................12.........
+...*..........-.....387...............*..588..............*..../...............315...................-...712..491.........956.....#.........
+.180.454...................104..661...91...*.............811....370......471...-....419....804..........*...................*...............
+.....*.......@../464........%..*............243.....578...................&..........*...........604..250.....784....750....998.............
+.....245....165.................771...................&.......#.691...768....654....261.........................*.......*............566....
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src/test/kotlin/day2/Day2Test.kt

@@ -5,7 +5,12 @@ import org.junit.jupiter.api.Test
 class Day2Test {
 
     @Test
-    fun readGames() {
-        Day2.readGames()
+    fun sumOfCompatibleGames() {
+        assert(Day2.sumOfCompatibleGames("src/test/resources/day2/input.txt", Hand(12, 13, 14)) == 8)
+    }
+
+    @Test
+    fun powerOfMinimumSetOfCubes() {
+        assert(Day2.powerOfMinimumSetOfCubes("src/test/resources/day2/input.txt") == 2286)
     }
 }

src/test/kotlin/day3/Day3Test.kt

@@ -0,0 +1,31 @@
+package day3
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import kotlin.test.assertContentEquals
+
+class Day3Test {
+
+    @Test
+    fun readParts() {
+        assertEquals(4361, Day3.sumOfSelectedParts("src/test/resources/day3/input.txt"))
+    }
+
+    @Test
+    fun testReadParts() {
+        assertContentEquals(
+            listOf(467, 114, 35, 633, 617, 58, 592, 755, 664, 598),
+            Day3.readParts(Day3.readLines("src/test/resources/day3/input.txt")).map(Part::number)
+        )
+    }
+
+    @Test
+    fun testOnly114And58DropOut() {
+        assertContentEquals(
+            listOf(467, 35, 633, 617, 592, 755, 664, 598),
+            Day3.readLines("src/test/resources/day3/input.txt").let { lines ->
+                Day3.readParts(lines).filter { part -> part.isSelected(lines) }.map(Part::number)
+            }
+        )
+    }
+}

src/test/resources/day2/input.txt

@@ -0,0 +1,5 @@
+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

src/test/resources/day3/input.txt

@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..