day 18 puzzle 1

day 16 puzzle 2
day 16 puzzle 1
2023-12-18 22:09:14 +01:00 · 2023-12-16 21:48:32 +01:00 · 2023-12-16 18:18:19 +01:00 · 2023-12-15 09:42:27 +01:00 · 2023-12-15 09:42:11 +01:00 · 2023-12-15 08:52:58 +01:00
82 changed files with 3175 additions and 8 deletions
--- a/README.md
+++ b/README.md
@@ -5,11 +5,11 @@ This repo contains my attempt at this year's Advent of Code (2023)
 I will try and do some problems (probably not all of them) in Scala

 ## Progress:
-#### Stars: 6 / 50
+#### Stars: 30 / 50
 |        Mon         |        Tue        |        Wed         |        Thu         |        Fri         |        Sat         |        Sun         |
-|:---:|:---:|:---:|:---:|:-----------------:|:-----------------:|:-----------------:|
+|:------------------:|:-----------------:|:------------------:|:------------------:|:------------------:|:------------------:|:------------------:|
 |                    |                   |                    |                    | 1<br>:star::star:  | 2<br>:star::star:  | 3<br>:star::star:  |
-|  4  |  5  |  6  |  7  |         8         |         9         |        10         |
-| 11  | 12  | 13  | 14  |        15         |        16         |        17         |
+| 4<br>:star::star:  | 5<br>:star::star: | 6<br>:star::star:  | 7<br>:star::star:  | 8<br>:star::star:  | 9<br>:star::star:  | 10<br>:star::star: |
+| 11<br>:star::star: |        12         | 13<br>:star::star: | 14<br>:star::star: | 15<br>:star::star: | 16<br>:star::star: |         17         |
 |         18         |        19         |         20         |         21         |         22         |         23         |         24         |
 |         25         |                   |                    |                    |                    |                    |                    |
--- a/src/day10/Painter.scala
+++ b/src/day10/Painter.scala
@@ -0,0 +1,77 @@
+package day10
+
+import scala.collection.mutable.ArrayBuffer
+
+class Painter(startX: Int, startY: Int, excludeX: Int, excludeY: Int) extends Walker(startX, startY, excludeX, excludeY) {
+  def walk(grid: Array[Array[Byte]], zones: Array[Array[Int]], path: ArrayBuffer[(Int, Int)]): Unit = {
+    val prevX: Int = lastX
+    val prevY: Int = lastY
+    val curX: Int = x
+    val curY: Int = y
+    val curTile: Byte = grid(y)(x)
+    super.walk(grid)
+    val newX: Int = x
+    val newY: Int = y
+    val dx: Int = newX - prevX
+    val dy: Int = newY - prevY
+
+    // West-East
+    if (curTile == 5) {
+      // Going east
+      if (dx > 0) {
+        setZone(path, zones, curX, curY - 1, 1)
+        setZone(path, zones, curX, curY + 1, 2)
+
+        // Going west
+      } else {
+        setZone(path, zones, curX, curY - 1, 2)
+        setZone(path, zones, curX, curY + 1, 1)
+      }
+
+    // North-South
+    } else if (curTile == 10) {
+      // Going south
+      if (dy > 0) {
+        setZone(path, zones, curX+1, curY, 1)
+        setZone(path, zones, curX-1, curY, 2)
+
+      // Going north
+      } else {
+        setZone(path, zones, curX+1, curY, 2)
+        setZone(path, zones, curX-1, curY, 1)
+      }
+
+    // Corner
+    } else if (curTile != 15) {
+      val east: Boolean = (curTile & 1) != 0
+      val south: Boolean = (curTile & 2) != 0
+
+      val toEast: Boolean = dx > 0
+      val toSouth: Boolean = dy > 0
+
+      val offsetBottom: Boolean = east ^ toEast ^ toSouth
+      val zoneY: Boolean = !toSouth ^ east
+
+      val offsetRight: Boolean = south ^ toEast ^ toSouth
+      val zoneX: Boolean = toEast ^ south
+
+      val offsetY: Int = if (offsetBottom) 1 else -1
+      val zoneYVal: Int = if (zoneY) 2 else 1
+      setZone(path, zones, curX, curY+offsetY, zoneYVal)
+
+      val offsetX: Int = if (offsetRight) 1 else -1
+      val zoneXVal: Int = if (zoneX) 2 else 1
+      setZone(path, zones, curX+offsetX, curY, zoneXVal)
+    }
+  }
+
+  private def setZone(path: ArrayBuffer[(Int, Int)], zones: Array[Array[Int]], posX: Int, posY: Int, zone: Int): Unit = {
+    val height: Int = zones.length
+    val width: Int = if (height == 0) 0 else zones(0).length
+    if (0 <= posX && posX < width && 0 <= posY && posY < height) {
+      if (!path.contains((posX, posY))) {
+        zones(posY)(posX) = zone
+      }
+    }
+  }
+}
--- a/src/day10/Puzzle1.scala
+++ b/src/day10/Puzzle1.scala
@@ -0,0 +1,74 @@
+package day10
+
+import scala.collection.immutable.HashMap
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var grid: Array[Array[Byte]] = Array.empty
+
+  // bits: NWSE
+  val TILES: Map[Char, Byte] = HashMap(
+    '|' -> 10,
+    '-' -> 5,
+    'L' -> 9,
+    'J' -> 12,
+    '7' -> 6,
+    'F' -> 3,
+    '.' -> 0,
+    'S' -> 15
+  )
+
+  var height: Int = 0
+  var width: Int = 0
+  var startX: Int = 0
+  var startY: Int = 0
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    height = lines.length
+    width = if (height == 0) 0 else lines(0).length
+    grid = Array.ofDim(height, width)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        grid(y)(x) = TILES(c)
+        if (c == 'S') {
+          startX = x
+          startY = y
+        }
+      }
+    }
+
+    source.close()
+  }
+
+  def calculateMaxDistance(): Int = {
+    val walker1: Walker = new Walker(startX, startY)
+    walker1.walk(grid)
+    val walker2: Walker = new Walker(startX, startY, walker1.getX(), walker1.getY())
+
+    while (walker1.getPos() != walker2.getPos()) {
+      walker2.walk(grid)
+      if (walker1.getPos() == walker2.getPos()) {
+        return walker2.getDistance()
+      }
+      walker1.walk(grid)
+    }
+    return walker1.getDistance()
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    val solution: Int = calculateMaxDistance()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day10/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day10/Puzzle2.scala
+++ b/src/day10/Puzzle2.scala
@@ -0,0 +1,195 @@
+package day10
+
+import util.Ansi
+
+import scala.collection.immutable.HashMap
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  var grid: Array[Array[Byte]] = Array.empty
+  var zones: Array[Array[Int]] = Array.empty
+
+  // bits: NWSE
+  val TILES: Map[Char, Byte] = HashMap(
+    '|' -> 10,
+    '-' -> 5,
+    'L' -> 9,
+    'J' -> 12,
+    '7' -> 6,
+    'F' -> 3,
+    '.' -> 0,
+    'S' -> 15
+  )
+
+  val TILE_CHARS: Map[Int, Char] = HashMap(
+    10 -> '│',
+    5 -> '─',
+    9 -> '└',
+    12 -> '┘',
+    6 -> '┐',
+    3 -> '┌',
+    0 -> ' ',
+    15 -> '█'
+  )
+
+  val TILE_CHARS_BOLD: Map[Int, Char] = HashMap(
+    10 -> '┃',
+    5 -> '━',
+    9 -> '┗',
+    12 -> '┛',
+    6 -> '┓',
+    3 -> '┏',
+    0 -> ' ',
+    15 -> '█'
+  )
+
+  var height: Int = 0
+  var width: Int = 0
+  var startX: Int = 0
+  var startY: Int = 0
+  var path: ArrayBuffer[(Int, Int)] = new ArrayBuffer()
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    height = lines.length
+    width = if (height == 0) 0 else lines(0).length
+    grid = Array.ofDim(height, width)
+    zones = Array.ofDim(height, width)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        grid(y)(x) = TILES(c)
+        if (c == 'S') {
+          startX = x
+          startY = y
+        }
+      }
+    }
+
+    source.close()
+  }
+
+  def display(): Unit = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        val tile: Byte = grid(y)(x)
+        val zone: Int = zones(y)(x)
+        if (zone == 1) {
+          print(Ansi.BG_RGB(163, 61, 61))
+        } else if (zone == 2) {
+          print(Ansi.BG_RGB(77, 163, 61))
+        }
+        if (path.contains((x, y))) {
+          print(Ansi.BOLD)
+          print(TILE_CHARS_BOLD(tile))
+        } else {
+          print(TILE_CHARS(tile))
+        }
+        print(Ansi.CLEAR)
+      }
+      println()
+    }
+  }
+
+  def calculateArea(): Int = {
+    path = new ArrayBuffer()
+    path.addOne((startX, startY))
+
+    val walker: Walker = new Walker(startX, startY)
+
+    do {
+      walker.walk(grid)
+      path.addOne(walker.getPos())
+    } while (walker.getX() != startX || walker.getY() != startY)
+    println(s"Found path (length = ${path.length})")
+
+    val painter: Painter = new Painter(startX, startY, 2*startX-path(1)._1, 2*startY-path(1)._2)
+    do {
+      painter.walk(grid, zones, path)
+    } while (painter.getX() != startX || painter.getY() != startY)
+    println("Painted path neighbours")
+
+    var newZones: Array[Array[Int]] = Array.ofDim(height, width)
+    var changed: Boolean = true
+    var exteriorZone: Int = 0
+
+    do {
+      changed = false
+      newZones = copyZones()
+      for (y: Int <- 0 until height) {
+        for (x: Int <- 0 until width) {
+          if (zones(y)(x) != 0) {
+            if (floodTile(x, y, newZones, path)) {
+              changed = true
+            }
+          }
+        }
+      }
+      zones = newZones
+    } while (changed)
+    println("Flooded zones")
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (x == 0 || x == width - 1 || y == 0 || y == height - 1) {
+          if (zones(y)(x) != 0) {
+            exteriorZone = zones(y)(x)
+          }
+        }
+      }
+    }
+    println(s"Found exterior zone: $exteriorZone")
+
+    var area: Int = 0
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (zones(y)(x) != exteriorZone && zones(y)(x) != 0) area += 1
+      }
+    }
+    println(s"Calculated area: $area")
+
+    return area
+  }
+
+  def floodTile(x: Int, y: Int, newZones: Array[Array[Int]], path: ArrayBuffer[(Int, Int)]): Boolean = {
+    var changed: Boolean = false
+    for ((dx: Int, dy: Int) <- Walker.OFFSETS) {
+      val x2: Int = x + dx
+      val y2: Int = y + dy
+      if (0 <= x2 && x2 < width && 0 <= y2 && y2 < height) {
+        if (zones(y2)(x2) == 0 && !path.contains((x2, y2))) {
+          newZones(y2)(x2) = zones(y)(x)
+          changed = true
+        }
+      }
+    }
+    return changed
+  }
+
+  def copyZones(): Array[Array[Int]] = {
+    val result: Array[Array[Int]] = Array.ofDim(height, width)
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        result(y)(x) = zones(y)(x)
+      }
+    }
+    return result
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    val solution: Int = calculateArea()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day10/input1.txt")
+    println(solution)
+    display()
+  }
+}
--- a/src/day10/Walker.scala
+++ b/src/day10/Walker.scala
@@ -0,0 +1,62 @@
+package day10
+
+class Walker {
+  protected var x: Int = 0
+  protected var y: Int = 0
+  protected var lastX: Int = -1
+  protected var lastY: Int = -1
+  protected var distance: Int = 0
+
+  def this(startX: Int, startY: Int) = {
+    this()
+    x = startX
+    y = startY
+  }
+
+  def this(startX: Int, startY: Int, excludeX: Int, excludeY: Int) = {
+    this(startX, startY)
+    lastX = excludeX
+    lastY = excludeY
+  }
+
+  def getX(): Int = x
+  def getY(): Int = y
+  def getPos(): (Int, Int) = (x, y)
+  def getDistance(): Int = distance
+
+  def walk(grid: Array[Array[Byte]]): Unit = {
+    val height: Int = grid.length
+    val width: Int = if (height == 0) 0 else grid(0).length
+    val (x2: Int, y2: Int) = getNextPos(grid, width, height)
+    lastX = x
+    lastY = y
+    x = x2
+    y = y2
+    distance += 1
+  }
+
+  private def getNextPos(grid: Array[Array[Byte]], width: Int, height: Int): (Int, Int) = {
+    val curTile: Byte = grid(y)(x)
+    for (((dx: Int, dy: Int), i: Int) <- Walker.OFFSETS.zipWithIndex) {
+      val x2: Int = x + dx
+      val y2: Int = y + dy
+      if (x2 != lastX || y2 != lastY) {
+        if (0 <= x2 && x2 < width && 0 <= y2 && y2 < height) {
+          val bit: Byte = (1 << i).toByte
+          val bit2: Byte = (1 << ((i + 2) % 4)).toByte
+          if ((curTile & bit) != 0 && (grid(y2)(x2) & bit2) != 0) {
+            return (x2, y2)
+          }
+        }
+      }
+    }
+
+    throw new Exception("Dead-end path")
+  }
+}
+
+object Walker {
+  val OFFSETS: Array[(Int, Int)] = Array(
+    (1, 0), (0, 1), (-1, 0), (0, -1)
+  )
+}
--- a/src/day11/Puzzle1.scala
+++ b/src/day11/Puzzle1.scala
@@ -0,0 +1,82 @@
+package day11
+
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var ogUniverse: Array[Array[Boolean]] = Array.empty
+  var ogHeight: Int = 0
+  var ogWidth: Int = 0
+  var colCounts: Array[Int] = Array.empty
+  var rowCounts: Array[Int] = Array.empty
+  var galaxies: ArrayBuffer[(Int, Int)] = new ArrayBuffer()
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    ogHeight = lines.length
+    ogWidth = if (ogHeight == 0) 0 else lines(0).length
+    ogUniverse = Array.ofDim(ogHeight, ogWidth)
+
+    colCounts = new Array(ogWidth)
+    rowCounts = new Array(ogHeight)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        if (c == '#') {
+          ogUniverse(y)(x) = true
+          colCounts(x) += 1
+          rowCounts(y) += 1
+        }
+      }
+    }
+
+    source.close()
+  }
+
+  def findGalaxiesRealPos(): Unit = {
+    galaxies = new ArrayBuffer()
+
+    var realX: Int = 0
+    var realY: Int = 0
+
+    for (ogY: Int <- 0 until ogHeight) {
+      realX = 0
+      for (ogX: Int <- 0 until ogWidth) {
+        if (ogUniverse(ogY)(ogX)) {
+          galaxies.addOne((realX, realY))
+        }
+        if (colCounts(ogX) == 0) realX += 1
+        realX += 1
+      }
+      if (rowCounts(ogY) == 0) realY += 1
+      realY += 1
+    }
+  }
+
+  def distance(g1: (Int, Int), g2: (Int, Int)): Int = {
+    return Math.abs(g2._1 - g1._1) + Math.abs(g2._2 - g1._2)
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+    findGalaxiesRealPos()
+
+    var solution: Int = 0
+
+    for (i: Int <- galaxies.indices) {
+      val g1: (Int, Int) = galaxies(i)
+      for (j: Int <- i+1 until galaxies.length) {
+        val g2: (Int, Int) = galaxies(j)
+        solution += distance(g1, g2)
+      }
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day11/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day11/Puzzle2.scala
+++ b/src/day11/Puzzle2.scala
@@ -0,0 +1,82 @@
+package day11
+
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  var ogUniverse: Array[Array[Boolean]] = Array.empty
+  var ogHeight: Int = 0
+  var ogWidth: Int = 0
+  var colCounts: Array[Int] = Array.empty
+  var rowCounts: Array[Int] = Array.empty
+  var galaxies: ArrayBuffer[(Long, Long)] = new ArrayBuffer()
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    ogHeight = lines.length
+    ogWidth = if (ogHeight == 0) 0 else lines(0).length
+    ogUniverse = Array.ofDim(ogHeight, ogWidth)
+
+    colCounts = new Array(ogWidth)
+    rowCounts = new Array(ogHeight)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        if (c == '#') {
+          ogUniverse(y)(x) = true
+          colCounts(x) += 1
+          rowCounts(y) += 1
+        }
+      }
+    }
+
+    source.close()
+  }
+
+  def findGalaxiesRealPos(age: Int): Unit = {
+    galaxies = new ArrayBuffer()
+
+    var realX: Long = 0
+    var realY: Long = 0
+
+    for (ogY: Int <- 0 until ogHeight) {
+      realX = 0
+      for (ogX: Int <- 0 until ogWidth) {
+        if (ogUniverse(ogY)(ogX)) {
+          galaxies.addOne((realX, realY))
+        }
+        if (colCounts(ogX) == 0) realX += age-1
+        realX += 1
+      }
+      if (rowCounts(ogY) == 0) realY += age-1
+      realY += 1
+    }
+  }
+
+  def distance(g1: (Long, Long), g2: (Long, Long)): Long = {
+    return Math.abs(g2._1 - g1._1) + Math.abs(g2._2 - g1._2)
+  }
+
+  def solve(path: String, age: Int=2): Long = {
+    loadInput(path)
+    findGalaxiesRealPos(age)
+
+    var solution: Long = 0
+
+    for (i: Int <- galaxies.indices) {
+      val g1: (Long, Long) = galaxies(i)
+      for (j: Int <- i+1 until galaxies.length) {
+        val g2: (Long, Long) = galaxies(j)
+        solution += distance(g1, g2)
+      }
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Long = solve("./res/day11/input1.txt", 1000000)
+    println(solution)
+  }
+}
--- a/src/day13/Puzzle1.scala
+++ b/src/day13/Puzzle1.scala
@@ -0,0 +1,92 @@
+package day13
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var maps: Array[Array[Array[Boolean]]] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: String = source.getLines().mkString("\n")
+
+    val mapsStr: Array[String] = lines.split("\n\n")
+    maps = new Array(mapsStr.length)
+
+    for ((mapStr: String, i: Int) <- mapsStr.zipWithIndex) {
+      val rows: Array[String] = mapStr.split("\n")
+      val map: Array[Array[Boolean]] = new Array(rows.length)
+      for ((row: String, j: Int) <- rows.zipWithIndex) {
+        map(j) = row.map(_ == '#').toArray
+      }
+      maps(i) = map
+    }
+
+    source.close()
+  }
+
+  def getReflectionValue(map: Array[Array[Boolean]]): Int = {
+    val height: Int = map.length
+    val width: Int = if (height == 0) 0 else map(0).length
+    var value: Int = 0
+
+    for (x: Int <- 0 until width-1) {
+      if (isReflection(map, x)) {
+        value += x+1
+      }
+    }
+
+    val mapT: Array[Array[Boolean]] = transpose(map)
+
+    for (y: Int <- 0 until height-1) {
+      if (isReflection(mapT, y)) {
+        value += 100*(y+1)
+      }
+    }
+
+    return value
+  }
+
+  def isReflection(map: Array[Array[Boolean]], x: Int): Boolean = {
+    for (row: Array[Boolean] <- map) {
+      val a = row.dropRight(row.length - x - 1).reverse
+      val b = row.drop(x+1)
+      for (i: Int <- 0 until Math.min(a.length, b.length)) {
+        if (a(i) != b(i)) {
+          return false
+        }
+      }
+    }
+    return true
+  }
+
+  def transpose(map: Array[Array[Boolean]]): Array[Array[Boolean]] = {
+    val height: Int = map.length
+    val width: Int = if (height == 0) 0 else map(0).length
+
+    val mapT: Array[Array[Boolean]] = Array.ofDim(width, height)
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        mapT(x)(y) = map(y)(x)
+      }
+    }
+
+    return mapT
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+
+    for (map: Array[Array[Boolean]] <- maps) {
+      solution += getReflectionValue(map)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day13/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day13/Puzzle2.scala
+++ b/src/day13/Puzzle2.scala
@@ -0,0 +1,94 @@
+package day13
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  var maps: Array[Array[Array[Boolean]]] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: String = source.getLines().mkString("\n")
+
+    val mapsStr: Array[String] = lines.split("\n\n")
+    maps = new Array(mapsStr.length)
+
+    for ((mapStr: String, i: Int) <- mapsStr.zipWithIndex) {
+      val rows: Array[String] = mapStr.split("\n")
+      val map: Array[Array[Boolean]] = new Array(rows.length)
+      for ((row: String, j: Int) <- rows.zipWithIndex) {
+        map(j) = row.map(_ == '#').toArray
+      }
+      maps(i) = map
+    }
+
+    source.close()
+  }
+
+  def getReflectionValue(map: Array[Array[Boolean]]): Int = {
+    val height: Int = map.length
+    val width: Int = if (height == 0) 0 else map(0).length
+    var value: Int = 0
+
+    for (x: Int <- 0 until width-1) {
+      if (isReflection(map, x)) {
+        value += x+1
+      }
+    }
+
+    val mapT: Array[Array[Boolean]] = transpose(map)
+
+    for (y: Int <- 0 until height-1) {
+      if (isReflection(mapT, y)) {
+        value += 100*(y+1)
+      }
+    }
+
+    return value
+  }
+
+  def isReflection(map: Array[Array[Boolean]], x: Int): Boolean = {
+    var diffs: Int = 0
+    for (row: Array[Boolean] <- map) {
+      val a = row.dropRight(row.length - x - 1).reverse
+      val b = row.drop(x+1)
+      for (i: Int <- 0 until Math.min(a.length, b.length)) {
+        if (a(i) != b(i)) {
+          diffs += 1
+          if (diffs > 1) return false
+        }
+      }
+    }
+    return diffs == 1
+  }
+
+  def transpose(map: Array[Array[Boolean]]): Array[Array[Boolean]] = {
+    val height: Int = map.length
+    val width: Int = if (height == 0) 0 else map(0).length
+
+    val mapT: Array[Array[Boolean]] = Array.ofDim(width, height)
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        mapT(x)(y) = map(y)(x)
+      }
+    }
+
+    return mapT
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+
+    for (map: Array[Array[Boolean]] <- maps) {
+      solution += getReflectionValue(map)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day13/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day14/Puzzle1.scala
+++ b/src/day14/Puzzle1.scala
@@ -0,0 +1,68 @@
+package day14
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  val CHARS: Array[Char] = Array('.', 'O', '#')
+  var platform: Array[Array[Int]] = Array.empty
+  var width: Int = 0
+  var height: Int = 0
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    platform = lines.map(_.map(CHARS.indexOf(_)).toArray)
+    height = platform.length
+    width = if (height == 0) 0 else platform(0).length
+
+    source.close()
+  }
+
+  def slideUp(): Unit = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (platform(y)(x) == 1) {
+          slideRockUp(x, y)
+        }
+      }
+    }
+  }
+
+  def slideRockUp(x: Int, y: Int): Unit = {
+    platform(y)(x) = 0
+    for (y2: Int <- y-1 to 0 by -1) {
+      if (platform(y2)(x) != 0) {
+        platform(y2+1)(x) = 1
+        return
+      }
+    }
+    platform(0)(x) = 1
+  }
+
+  def computeLoad(): Int = {
+    var load: Int = 0
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (platform(y)(x) == 1) {
+          load += height-y
+        }
+      }
+    }
+    return load
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+    slideUp()
+
+    val solution: Int = computeLoad()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day14/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day14/Puzzle2.scala
+++ b/src/day14/Puzzle2.scala
@@ -0,0 +1,153 @@
+package day14
+
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  val CHARS: Array[Char] = Array('.', 'O', '#')
+  var platform: Array[Array[Int]] = Array.empty
+  var prevPlatform: Array[Array[Int]] = Array.empty
+  var history: ArrayBuffer[Array[Array[Int]]] = new ArrayBuffer()
+  var width: Int = 0
+  var height: Int = 0
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    platform = lines.map(_.map(CHARS.indexOf(_)).toArray)
+    height = platform.length
+    width = if (height == 0) 0 else platform(0).length
+    prevPlatform = Array.ofDim(height, width)
+
+    source.close()
+  }
+
+  def slideUp(): Unit = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (platform(y)(x) == 1) {
+          slideRockUp(x, y)
+        }
+      }
+    }
+  }
+
+  def slideRockUp(x: Int, y: Int): Unit = {
+    platform(y)(x) = 0
+    for (y2: Int <- y-1 to 0 by -1) {
+      if (platform(y2)(x) != 0) {
+        platform(y2+1)(x) = 1
+        return
+      }
+    }
+    platform(0)(x) = 1
+  }
+
+  def rotate(): Unit = {
+    val result: Array[Array[Int]] = Array.ofDim(width, height)
+    width += height
+    height = width - height
+    width = width - height
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        result(y)(x) = platform(width-x-1)(y)
+      }
+    }
+    platform = result
+  }
+
+  def cycle(): Unit = {
+    slideUp()
+    rotate()
+    slideUp()
+    rotate()
+    slideUp()
+    rotate()
+    slideUp()
+    rotate()
+  }
+
+  def copyPlatform(): Array[Array[Int]] = {
+    val result: Array[Array[Int]] = Array.ofDim(height, width)
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        result(y)(x) = platform(y)(x)
+      }
+    }
+    return result
+  }
+
+  def computeLoad(): Int = {
+    var load: Int = 0
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (platform(y)(x) == 1) {
+          load += height-y
+        }
+      }
+    }
+    return load
+  }
+
+  def getLoopStart(): Int = {
+    for ((prevPlatform: Array[Array[Int]], i: Int) <- history.zipWithIndex) {
+      if (noChange(prevPlatform)) return i
+    }
+    return -1
+  }
+
+  def noChange(prevPlatform: Array[Array[Int]]): Boolean = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (prevPlatform(y)(x) != platform(y)(x)) {
+          return false
+        }
+      }
+    }
+    return true
+  }
+
+  def hasLooped(): Boolean = getLoopStart() != -1
+
+  def repeatCycle(count: Int): Unit = {
+    for (i: Int <- 0 until count) {
+      history.prepend(copyPlatform())
+      cycle()
+      //display()
+      if (hasLooped()) {
+        val loopStart: Int = getLoopStart()
+        val loopOffset: Int = (count - i - 1) % (loopStart + 1)
+        val finalI: Int = loopStart - loopOffset
+
+        platform = history(finalI)
+        return
+      }
+    }
+  }
+
+  def display(): Unit = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        print(CHARS(platform(y)(x)))
+      }
+      println()
+    }
+    println()
+  }
+
+  def solve(path: String, cycles: Int): Int = {
+    loadInput(path)
+    repeatCycle(cycles)
+
+    val solution: Int = computeLoad()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day14/input1.txt", 1000000000)
+    println(solution)
+  }
+}
--- a/src/day15/Box.scala
+++ b/src/day15/Box.scala
@@ -0,0 +1,33 @@
+package day15
+
+import scala.collection.mutable.ArrayBuffer
+
+class Box(val id: Int) {
+  var lenses: ArrayBuffer[Lens] = new ArrayBuffer()
+  var lensesLabels: ArrayBuffer[String] = new ArrayBuffer()
+
+  def addLens(lens: Lens): Unit = {
+    if (lensesLabels.contains(lens.label)) {
+      val i: Int = lensesLabels.indexOf(lens.label)
+      lenses(i) = lens
+    } else {
+      lenses.addOne(lens)
+      lensesLabels.addOne(lens.label)
+    }
+  }
+
+  def removeLens(label: String): Unit = {
+    if (lensesLabels.contains(label)) {
+      val i: Int = lensesLabels.indexOf(label)
+      lenses.remove(i)
+      lensesLabels.remove(i)
+    }
+  }
+  def getFocusingPower(): Long = {
+    var power: Long = 0
+    for ((lens: Lens, i: Int) <- lenses.zipWithIndex) {
+      power += (i+1) * lens.focalLength
+    }
+    return power
+  }
+}
--- a/src/day15/Lens.scala
+++ b/src/day15/Lens.scala
@@ -0,0 +1,5 @@
+package day15
+
+class Lens(val label: String, val focalLength: Int) {
+
+}
--- a/src/day15/Puzzle1.scala
+++ b/src/day15/Puzzle1.scala
@@ -0,0 +1,42 @@
+package day15
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var values: Array[String] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val line: String = source.getLines().mkString
+
+    values = line.split(",")
+
+    source.close()
+  }
+
+  def hash(str: String): Int = {
+    var value: Int = 0
+    for (c: Char <- str) {
+      value += c
+      value *= 17
+      value %= 256
+    }
+    return value
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+
+    for (value: String <- values) {
+      solution += hash(value)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day15/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day15/Puzzle2.scala
+++ b/src/day15/Puzzle2.scala
@@ -0,0 +1,71 @@
+package day15
+
+import scala.io.{BufferedSource, Source}
+import scala.util.matching.Regex
+import scala.util.matching.Regex.Match
+
+object Puzzle2 {
+  var steps: Array[String] = Array.empty
+  val boxes: Array[Box] = new Array(256)
+  val regex: Regex = new Regex("([a-z]+)(-|=\\d)")
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val line: String = source.getLines().mkString
+
+    for (i: Int <- 0 until 256) {
+      boxes(i) = new Box(i)
+    }
+
+    steps = line.split(",")
+
+    source.close()
+  }
+
+  def hash(str: String): Int = {
+    var value: Int = 0
+    for (c: Char <- str) {
+      value += c
+      value *= 17
+      value %= 256
+    }
+    return value
+  }
+
+  def getFocusingPower(): Long = {
+    var power: Long = 0
+    for (box: Box <- boxes) {
+      power += (box.id+1) * box.getFocusingPower()
+    }
+    return power
+  }
+
+  def placeLenses(): Unit = {
+    for (step: String <- steps) {
+      val m: Match = regex.findFirstMatchIn(step).get
+      val label: String = m.group(1)
+      val labelHash: Int = hash(label)
+      val action: Char = m.group(2)(0)
+      val box: Box = boxes(labelHash)
+      if (action == '=') {
+        val lens: Lens = new Lens(label, m.group(2)(1) - '0')
+        box.addLens(lens)
+      } else {
+        box.removeLens(label)
+      }
+    }
+  }
+
+  def solve(path: String): Long = {
+    loadInput(path)
+    placeLenses()
+
+    val solution: Long = getFocusingPower()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Long = solve("./res/day15/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day16/Mirrors.scala
+++ b/src/day16/Mirrors.scala
@@ -0,0 +1,10 @@
+package day16
+
+object Mirrors extends Enumeration {
+  type Mirror = Value
+  val NONE = Value(".")
+  val DIAGONAL_TL_BR = Value("\\")
+  val DIAGONAL_BL_TR = Value("/")
+  val SPLITTER_HOR = Value("-")
+  val SPLITTER_VER = Value("|")
+}
--- a/src/day16/Puzzle1.scala
+++ b/src/day16/Puzzle1.scala
@@ -0,0 +1,103 @@
+package day16
+
+import day16.Mirrors.{DIAGONAL_BL_TR, DIAGONAL_TL_BR, Mirror, NONE, SPLITTER_HOR, SPLITTER_VER}
+
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var mirrors: Array[Array[Mirror]] = Array.empty
+  var energized: Array[Array[Boolean]] = Array.empty
+  var width: Int = 0
+  var height: Int = 0
+  val OFFSETS: Array[(Int, Int)] = Array(
+    (1, 0), (0, 1), (-1, 0), (0, -1)
+  )
+  val path: ArrayBuffer[(Int, Int, Int)] = new ArrayBuffer()
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    height = lines.length
+    width = if (height == 0) 0 else lines(0).length
+    mirrors = Array.ofDim(height, width)
+    energized = Array.ofDim(height, width)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        val mirror: Mirror = Mirrors.withName(""+c)
+        mirrors(y)(x) = mirror
+      }
+    }
+
+    source.close()
+  }
+
+  def shootBeam(startX: Int, startY: Int, startDir: Int): Unit = {
+    if (startX < 0 || startX >= width || startY < 0 || startY >= height) return
+    var x: Int = startX
+    var y: Int = startY
+    var dir: Int = startDir
+    var continue: Boolean = true
+    do {
+      if (path.contains((x, y, dir))) return
+      path.addOne((x, y, dir))
+
+      energized(y)(x) = true
+
+      mirrors(y)(x) match {
+        case NONE => {}
+        case DIAGONAL_TL_BR => {
+          dir = Math.floorDiv(dir, 2)*2 + 1 - (dir % 2)
+        }
+        case DIAGONAL_BL_TR => {
+          dir = 3 - dir
+        }
+        case SPLITTER_HOR => {
+          if (dir % 2 == 1) {
+            continue = false
+            shootBeam(x+1, y, 0)
+            shootBeam(x-1, y, 2)
+          }
+        }
+        case SPLITTER_VER => {
+          if (dir % 2 == 0) {
+            continue = false
+            shootBeam(x, y+1, 1)
+            shootBeam(x, y-1, 3)
+          }
+        }
+      }
+
+      if (continue) {
+        val offset: (Int, Int) = OFFSETS(dir)
+        x += offset._1
+        y += offset._2
+      }
+
+      if (x < 0 || x >= width) continue = false
+      if (y < 0 || y >= height) continue = false
+    } while (continue)
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+    shootBeam(0, 0, 0)
+
+    var solution: Int = 0
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (energized(y)(x)) solution += 1
+      }
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day16/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day16/Puzzle2.scala
+++ b/src/day16/Puzzle2.scala
@@ -0,0 +1,136 @@
+package day16
+
+import day16.Mirrors.{DIAGONAL_BL_TR, DIAGONAL_TL_BR, Mirror, NONE, SPLITTER_HOR, SPLITTER_VER}
+
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  var mirrors: Array[Array[Mirror]] = Array.empty
+  var energized: Array[Array[Boolean]] = Array.empty
+  var width: Int = 0
+  var height: Int = 0
+  val OFFSETS: Array[(Int, Int)] = Array(
+    (1, 0), (0, 1), (-1, 0), (0, -1)
+  )
+  var path: ArrayBuffer[(Int, Int, Int)] = new ArrayBuffer()
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    height = lines.length
+    width = if (height == 0) 0 else lines(0).length
+    mirrors = Array.ofDim(height, width)
+
+    for ((line: String, y: Int) <- lines.zipWithIndex) {
+      for ((c: Char, x: Int) <- line.zipWithIndex) {
+        val mirror: Mirror = Mirrors.withName(""+c)
+        mirrors(y)(x) = mirror
+      }
+    }
+
+    source.close()
+  }
+
+  def shootBeam(startX: Int, startY: Int, startDir: Int): Unit = {
+    if (startX < 0 || startX >= width || startY < 0 || startY >= height) return
+    var x: Int = startX
+    var y: Int = startY
+    var dir: Int = startDir
+    var continue: Boolean = true
+    do {
+      if (path.contains((x, y, dir))) return
+      path.addOne((x, y, dir))
+
+      energized(y)(x) = true
+
+      mirrors(y)(x) match {
+        case NONE => {}
+        case DIAGONAL_TL_BR => {
+          dir = Math.floorDiv(dir, 2)*2 + 1 - (dir % 2)
+        }
+        case DIAGONAL_BL_TR => {
+          dir = 3 - dir
+        }
+        case SPLITTER_HOR => {
+          if (dir % 2 == 1) {
+            continue = false
+            shootBeam(x+1, y, 0)
+            shootBeam(x-1, y, 2)
+          }
+        }
+        case SPLITTER_VER => {
+          if (dir % 2 == 0) {
+            continue = false
+            shootBeam(x, y+1, 1)
+            shootBeam(x, y-1, 3)
+          }
+        }
+      }
+
+      if (continue) {
+        val offset: (Int, Int) = OFFSETS(dir)
+        x += offset._1
+        y += offset._2
+      }
+
+      if (x < 0 || x >= width) continue = false
+      if (y < 0 || y >= height) continue = false
+    } while (continue)
+  }
+
+  def countEnergized(): Int = {
+    var count: Int = 0
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (energized(y)(x)) count += 1
+      }
+    }
+    return count
+  }
+
+  def clearEnergized(): Unit = {
+    energized = Array.ofDim(height, width)
+    path.clear()
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+    val totalSteps: Int = (width + height)*2
+
+    for (y: Int <- 0 until height) {
+      print(f"\r${2.0*y/totalSteps*100}%.2f%%")
+      clearEnergized()
+      shootBeam(0, y, 0)
+      solution = Math.max(solution, countEnergized())
+
+      print(f"\r${(2.0*y+1)/totalSteps*100}%.2f%%")
+      clearEnergized()
+      shootBeam(width-1, y, 1)
+      solution = Math.max(solution, countEnergized())
+    }
+
+    for (x: Int <- 0 until width) {
+      print(f"\r${(2.0*x+height*2)/totalSteps*100}%.2f%%")
+      clearEnergized()
+      shootBeam(x, 0, 1)
+      solution = Math.max(solution, countEnergized())
+
+      print(f"\r${(2.0*x+height*2+1)/totalSteps*100}%.2f%%")
+      clearEnergized()
+      shootBeam(x, height-1, 3)
+      solution = Math.max(solution, countEnergized())
+    }
+    println("100%")
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day16/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day18/Painter.scala
+++ b/src/day18/Painter.scala
@@ -0,0 +1,77 @@
+package day18
+
+import scala.collection.mutable.ArrayBuffer
+
+class Painter(startX: Int, startY: Int, excludeX: Int, excludeY: Int) extends Walker(startX, startY, excludeX, excludeY) {
+  def walk(grid: Array[Array[Byte]], zones: Array[Array[Int]], path: ArrayBuffer[(Int, Int)]): Unit = {
+    val prevX: Int = lastX
+    val prevY: Int = lastY
+    val curX: Int = x
+    val curY: Int = y
+    val curTile: Byte = grid(y)(x)
+    super.walk(grid)
+    val newX: Int = x
+    val newY: Int = y
+    val dx: Int = newX - prevX
+    val dy: Int = newY - prevY
+
+    // West-East
+    if (curTile == 5) {
+      // Going east
+      if (dx > 0) {
+        setZone(path, zones, curX, curY - 1, 1)
+        setZone(path, zones, curX, curY + 1, 2)
+
+        // Going west
+      } else {
+        setZone(path, zones, curX, curY - 1, 2)
+        setZone(path, zones, curX, curY + 1, 1)
+      }
+
+    // North-South
+    } else if (curTile == 10) {
+      // Going south
+      if (dy > 0) {
+        setZone(path, zones, curX+1, curY, 1)
+        setZone(path, zones, curX-1, curY, 2)
+
+      // Going north
+      } else {
+        setZone(path, zones, curX+1, curY, 2)
+        setZone(path, zones, curX-1, curY, 1)
+      }
+
+    // Corner
+    } else if (curTile != 15) {
+      val east: Boolean = (curTile & 1) != 0
+      val south: Boolean = (curTile & 2) != 0
+
+      val toEast: Boolean = dx > 0
+      val toSouth: Boolean = dy > 0
+
+      val offsetBottom: Boolean = east ^ toEast ^ toSouth
+      val zoneY: Boolean = !toSouth ^ east
+
+      val offsetRight: Boolean = south ^ toEast ^ toSouth
+      val zoneX: Boolean = toEast ^ south
+
+      val offsetY: Int = if (offsetBottom) 1 else -1
+      val zoneYVal: Int = if (zoneY) 2 else 1
+      setZone(path, zones, curX, curY+offsetY, zoneYVal)
+
+      val offsetX: Int = if (offsetRight) 1 else -1
+      val zoneXVal: Int = if (zoneX) 2 else 1
+      setZone(path, zones, curX+offsetX, curY, zoneXVal)
+    }
+  }
+
+  private def setZone(path: ArrayBuffer[(Int, Int)], zones: Array[Array[Int]], posX: Int, posY: Int, zone: Int): Unit = {
+    val height: Int = zones.length
+    val width: Int = if (height == 0) 0 else zones(0).length
+    if (0 <= posX && posX < width && 0 <= posY && posY < height) {
+      if (!path.contains((posX, posY))) {
+        zones(posY)(posX) = zone
+      }
+    }
+  }
+}
--- a/src/day18/Puzzle1.scala
+++ b/src/day18/Puzzle1.scala
@@ -0,0 +1,234 @@
+package day18
+
+import util.Ansi
+
+import scala.collection.immutable.HashMap
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var grid: Array[Array[Byte]] = Array.empty
+  var zones: Array[Array[Int]] = Array.empty
+
+  val OFFSETS: Array[(Int, Int)] = Array(
+    (1, 0), (0, 1), (-1, 0), (0, -1)
+  )
+  val DIRS: String = "RDLU"
+
+  // bits: NWSE
+  val TILES: Map[Char, Byte] = HashMap(
+    '|' -> 10,
+    '-' -> 5,
+    'L' -> 9,
+    'J' -> 12,
+    '7' -> 6,
+    'F' -> 3,
+    '.' -> 0,
+    'S' -> 15
+  )
+
+  val TILE_CHARS: Map[Int, Char] = HashMap(
+    10 -> '│',
+    5 -> '─',
+    9 -> '└',
+    12 -> '┘',
+    6 -> '┐',
+    3 -> '┌',
+    0 -> ' ',
+    15 -> '█'
+  )
+
+  val TILE_CHARS_BOLD: Map[Int, Char] = HashMap(
+    10 -> '┃',
+    5 -> '━',
+    9 -> '┗',
+    12 -> '┛',
+    6 -> '┓',
+    3 -> '┏',
+    0 -> ' ',
+    15 -> '█'
+  )
+
+  var height: Int = 0
+  var width: Int = 0
+  var startX: Int = 0
+  var startY: Int = 0
+  var path: ArrayBuffer[(Int, Int)] = new ArrayBuffer()
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    var x: Int = 0
+    var y: Int = 0
+
+    var minX: Int = 0
+    var minY: Int = 0
+    var maxX: Int = 0
+    var maxY: Int = 0
+
+    for (line: String <- lines) {
+      val parts: Array[String] = line.split(" ")
+      val dir: Int = DIRS.indexOf(parts(0))
+      val dist: Int = parts(1).toInt
+      val offset: (Int, Int) = OFFSETS(dir)
+      x += offset._1*dist
+      y += offset._2*dist
+      minX = math.min(minX, x)
+      minY = math.min(minY, y)
+      maxX = math.max(maxX, x)
+      maxY = math.max(maxY, y)
+    }
+
+    width = maxX - minX + 1
+    height = maxY - minY + 1
+
+    grid = Array.ofDim(height, width)
+    zones = Array.ofDim(height, width)
+
+    x = -minX
+    y = -minY
+    var prevDir: Int = DIRS.indexOf(lines.last.split(" ")(0))
+    startX = x
+    startY = y
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      val parts: Array[String] = line.split(" ")
+      val dir: Int = DIRS.indexOf(parts(0))
+      val dist: Int = parts(1).toInt
+      val offset: (Int, Int) = OFFSETS(dir)
+
+      for (_: Int <- 0 until dist) {
+        val prevBit: Int = 1 << ((prevDir + 2) % 4)
+        val curBit: Int = 1 << dir
+        grid(y)(x) = (prevBit| curBit).toByte
+        x += offset._1
+        y += offset._2
+        prevDir = dir
+      }
+    }
+
+    source.close()
+  }
+
+  def display(): Unit = {
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        val tile: Byte = grid(y)(x)
+        val zone: Int = zones(y)(x)
+        if (zone == 1) {
+          print(Ansi.BG_RGB(163, 61, 61))
+        } else if (zone == 2) {
+          print(Ansi.BG_RGB(77, 163, 61))
+        }
+        if (path.contains((x, y))) {
+          print(Ansi.BOLD)
+          print(TILE_CHARS_BOLD(tile))
+        } else {
+          print(TILE_CHARS(tile))
+        }
+        print(Ansi.CLEAR)
+      }
+      println()
+    }
+  }
+
+  def calculateArea(): Int = {
+    path = new ArrayBuffer()
+    path.addOne((startX, startY))
+
+    val walker: Walker = new Walker(startX, startY)
+
+    do {
+      walker.walk(grid)
+      path.addOne(walker.getPos())
+    } while (walker.getX() != startX || walker.getY() != startY)
+    println(s"Found path (length = ${path.length})")
+
+    val painter: Painter = new Painter(startX, startY, 2*startX-path(1)._1, 2*startY-path(1)._2)
+    do {
+      painter.walk(grid, zones, path)
+    } while (painter.getX() != startX || painter.getY() != startY)
+    println("Painted path neighbours")
+
+    var newZones: Array[Array[Int]] = Array.ofDim(height, width)
+    var changed: Boolean = true
+    var exteriorZone: Int = 0
+
+    do {
+      changed = false
+      newZones = copyZones()
+      for (y: Int <- 0 until height) {
+        for (x: Int <- 0 until width) {
+          if (zones(y)(x) != 0) {
+            if (floodTile(x, y, newZones, path)) {
+              changed = true
+            }
+          }
+        }
+      }
+      zones = newZones
+    } while (changed)
+    println("Flooded zones")
+
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (x == 0 || x == width - 1 || y == 0 || y == height - 1) {
+          if (zones(y)(x) != 0) {
+            exteriorZone = zones(y)(x)
+          }
+        }
+      }
+    }
+    println(s"Found exterior zone: $exteriorZone")
+
+    var area: Int = 0
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        if (zones(y)(x) != exteriorZone) area += 1
+      }
+    }
+    println(s"Calculated area: $area")
+
+    return area
+  }
+
+  def floodTile(x: Int, y: Int, newZones: Array[Array[Int]], path: ArrayBuffer[(Int, Int)]): Boolean = {
+    var changed: Boolean = false
+    for ((dx: Int, dy: Int) <- Walker.OFFSETS) {
+      val x2: Int = x + dx
+      val y2: Int = y + dy
+      if (0 <= x2 && x2 < width && 0 <= y2 && y2 < height) {
+        if (zones(y2)(x2) == 0 && !path.contains((x2, y2))) {
+          newZones(y2)(x2) = zones(y)(x)
+          changed = true
+        }
+      }
+    }
+    return changed
+  }
+
+  def copyZones(): Array[Array[Int]] = {
+    val result: Array[Array[Int]] = Array.ofDim(height, width)
+    for (y: Int <- 0 until height) {
+      for (x: Int <- 0 until width) {
+        result(y)(x) = zones(y)(x)
+      }
+    }
+    return result
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    val solution: Int = calculateArea()
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day18/input1.txt")
+    println(solution)
+    //display()
+  }
+}
--- a/src/day18/Walker.scala
+++ b/src/day18/Walker.scala
@@ -0,0 +1,62 @@
+package day18
+
+class Walker {
+  protected var x: Int = 0
+  protected var y: Int = 0
+  protected var lastX: Int = -1
+  protected var lastY: Int = -1
+  protected var distance: Int = 0
+
+  def this(startX: Int, startY: Int) = {
+    this()
+    x = startX
+    y = startY
+  }
+
+  def this(startX: Int, startY: Int, excludeX: Int, excludeY: Int) = {
+    this(startX, startY)
+    lastX = excludeX
+    lastY = excludeY
+  }
+
+  def getX(): Int = x
+  def getY(): Int = y
+  def getPos(): (Int, Int) = (x, y)
+  def getDistance(): Int = distance
+
+  def walk(grid: Array[Array[Byte]]): Unit = {
+    val height: Int = grid.length
+    val width: Int = if (height == 0) 0 else grid(0).length
+    val (x2: Int, y2: Int) = getNextPos(grid, width, height)
+    lastX = x
+    lastY = y
+    x = x2
+    y = y2
+    distance += 1
+  }
+
+  private def getNextPos(grid: Array[Array[Byte]], width: Int, height: Int): (Int, Int) = {
+    val curTile: Byte = grid(y)(x)
+    for (((dx: Int, dy: Int), i: Int) <- Walker.OFFSETS.zipWithIndex) {
+      val x2: Int = x + dx
+      val y2: Int = y + dy
+      if (x2 != lastX || y2 != lastY) {
+        if (0 <= x2 && x2 < width && 0 <= y2 && y2 < height) {
+          val bit: Byte = (1 << i).toByte
+          val bit2: Byte = (1 << ((i + 2) % 4)).toByte
+          if ((curTile & bit) != 0 && (grid(y2)(x2) & bit2) != 0) {
+            return (x2, y2)
+          }
+        }
+      }
+    }
+
+    throw new Exception("Dead-end path")
+  }
+}
+
+object Walker {
+  val OFFSETS: Array[(Int, Int)] = Array(
+    (1, 0), (0, 1), (-1, 0), (0, -1)
+  )
+}
--- a/src/day4/Puzzle1.scala
+++ b/src/day4/Puzzle1.scala
@@ -0,0 +1,44 @@
+package day4
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  case class Card(validNumbers: Array[Int], myNumbers: Array[Int])
+
+  var cards: Array[Card] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+
+    val lines: Array[String] = source.getLines().toArray
+    cards = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      val parts: Array[String] = line.split(": +")(1).split(" +\\| +")
+      val validNumbers: Array[Int] = parts(0).split(" +").map(n => n.toInt)
+      val myNumbers: Array[Int] = parts(1).split(" +").map(n => n.toInt)
+      cards(i) = Card(validNumbers, myNumbers)
+    }
+
+    source.close()
+  }
+
+  def computeGain(): Int = {
+    var gain: Int = 0
+    for (card: Card <- cards) {
+      val validCount: Int = card.validNumbers.intersect(card.myNumbers).length
+      if (validCount >= 1) {
+        gain += Math.pow(2, validCount-1).toInt
+      }
+    }
+    return gain
+  }
+  def solve(path: String): Int = {
+    loadInput(path)
+    return computeGain()
+  }
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("res/day4/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day4/Puzzle2.scala
+++ b/src/day4/Puzzle2.scala
@@ -0,0 +1,48 @@
+package day4
+
+import scala.collection.mutable
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  case class Card(id: Int, validNumbers: Array[Int], myNumbers: Array[Int], var score: Int = 0, var count: Int = 1)
+
+  var cards: Array[Card] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+
+    val lines: Array[String] = source.getLines().toArray
+    cards = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      val parts: Array[String] = line.split(": +")(1).split(" +\\| +")
+      val validNumbers: Array[Int] = parts(0).split(" +").map(n => n.toInt)
+      val myNumbers: Array[Int] = parts(1).split(" +").map(n => n.toInt)
+      cards(i) = Card(i, validNumbers, myNumbers)
+    }
+
+    source.close()
+  }
+
+  def computeScores(): Unit = {
+    for (card: Card <- cards) {
+      card.score = card.validNumbers.intersect(card.myNumbers).length
+    }
+  }
+  def solve(path: String): Int = {
+    loadInput(path)
+    computeScores()
+    var count: Int = 0
+    for (card: Card <- cards) {
+      count += card.count
+      for (i: Int <- 0 until card.score) {
+        cards(card.id + i + 1).count += card.count
+      }
+    }
+    return count
+  }
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("res/day4/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day5/Puzzle1.scala
+++ b/src/day5/Puzzle1.scala
@@ -0,0 +1,83 @@
+package day5
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  case class Range(startSrc: Long, startDst: Long, length: Long)
+  var forwardingTables: Array[Array[Range]] = Array.empty
+  var seeds: Array[Long] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+
+    val almanac: String = source.getLines().mkString("\n")
+    val tables: Array[String] = almanac.split("\n\n")
+
+    forwardingTables = new Array(tables.length - 1)
+    seeds = tables(0).substring(7).split(" ").map(s => s.toLong)
+
+    for (i: Int <- 1 until tables.length) {
+      val lines: Array[String] = tables(i).split(":\n")(1).split("\n")
+      val table: Array[Range] = new Array(lines.length)
+      for ((line: String, j: Int) <- lines.zipWithIndex) {
+        val values: Array[Long] = line.split(" ").map(v => v.toLong)
+        table(j) = Range(values(1), values(0), values(2))
+      }
+      forwardingTables(i-1) = table
+    }
+
+    source.close()
+  }
+
+  def sortTables(): Unit = {
+    for (table: Array[Range] <- forwardingTables) {
+      var changed: Boolean = false
+      do {
+        changed = false
+        for (i: Int <- 0 until table.length-1) {
+          if (table(i).startSrc >= table(i + 1).startSrc + table(i + 1).length) {
+            changed = true
+            val range: Range = table(i)
+            table(i) = table(i + 1)
+            table(i + 1) = range
+          }
+        }
+      } while (changed)
+    }
+  }
+  def map(seed: Long): Long = {
+    var value: Long = seed
+    for (i: Int <- forwardingTables.indices) {
+      value = forward(value, i)
+    }
+    return value
+  }
+
+  def forward(value: Long, tableI: Int): Long = {
+    for (range: Range <- forwardingTables(tableI)) {
+      if (value >= range.startSrc) {
+        if (value < range.startSrc + range.length) {
+          return value - range.startSrc + range.startDst
+        }
+      } else {
+        return value
+      }
+    }
+    return value
+  }
+  def solve(path: String): Long = {
+    loadInput(path)
+    sortTables()
+    var smallest: Long = -1
+    for (seed: Long <- seeds) {
+      val location: Long = map(seed)
+      if (smallest == -1 || location < smallest) {
+        smallest = location
+      }
+    }
+    return smallest
+  }
+  def main(args: Array[String]): Unit = {
+    val solution: Long = solve("res/day5/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day5/Puzzle2.scala
+++ b/src/day5/Puzzle2.scala
@@ -0,0 +1,205 @@
+package day5
+
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  case class Range(startSrc: Long, startDst: Long, length: Long, dstTable: Int) {
+    def endSrc: Long = startSrc + length
+    def endDst: Long = startDst + length
+    def containsSrc(src: Long): Boolean = startSrc <= src && src < endSrc
+    def containsDst(dst: Long): Boolean = startDst <= dst && dst < endDst
+    def forward(src: Long): Long = startDst + src - startSrc
+    def backward(dst: Long): Long = startSrc + dst - startDst
+    override def toString: String = s"[$startSrc;$endSrc[ -> ($dstTable) [$startDst;$endDst["
+  }
+
+  class Table(val id: Int) {
+    var ranges: ArrayBuffer[Range] = new ArrayBuffer()
+
+    def addRange(range: Range): Unit = ranges.addOne(range)
+
+    /**
+     * Sorts the ranges in ascending order
+     */
+    def sortRanges(): Unit = {
+      var changed: Boolean = false
+      do {
+        changed = false
+        for (i: Int <- 0 until ranges.length-1) {
+          if (ranges(i).startSrc >= ranges(i + 1).startSrc + ranges(i + 1).length) {
+            changed = true
+            val range: Range = ranges(i)
+            ranges(i) = ranges(i + 1)
+            ranges(i + 1) = range
+          }
+        }
+      } while (changed)
+    }
+
+    /**
+     * Fills the gaps between ranges with identity ranges (i.e. which keep values unchanged)
+     */
+    def fillGaps(): Unit = {
+      var r1: Range = Range(0, 0, 0, id + 1)
+      var r2: Range = r1
+      var i: Int = 0
+      while (i < ranges.length) {
+        r2 = ranges(i)
+        val start: Long = r1.startSrc+r1.length
+        if (start != r2.startSrc) {
+          ranges.insert(i, Range(start, start, r2.startSrc - start, id+1))
+          i += 1
+        }
+        r1 = r2
+        i += 1
+      }
+    }
+
+    /**
+     * Forwards a value through this table
+     * @param src The source to forward
+     * @return A pair containing the destination value and new table id
+     */
+    def forward(src: Long): (Long, Int) = {
+      for (range: Range <- ranges) {
+        if (range.containsSrc(src)) return (range.forward(src), range.dstTable)
+      }
+      return (src, id+1)
+    }
+
+    /**
+     * Forwards a value in reverse through this table
+     * @param dst The destination to "backward"
+     * @return A pair containing the source value and new table id
+     */
+    def backward(dst: Long): (Long, Int) = {
+      for (range: Range <- ranges) {
+        if (range.containsDst(dst)) return (range.backward(dst), id)
+      }
+      return (dst, id)
+    }
+
+    override def toString: String = s"Table $id:\n  " + ranges.mkString("\n  ")
+  }
+
+  var forwardingTables: Array[Table] = Array.empty
+  var seeds: Array[Long] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+
+    val almanac: String = source.getLines().mkString("\n")
+    val tables: Array[String] = almanac.split("\n\n")
+
+    forwardingTables = new Array(tables.length - 1)
+    seeds = tables(0).substring(7).split(" ").map(s => s.toLong)
+
+    for (i: Int <- 1 until tables.length) {
+      val lines: Array[String] = tables(i).split(":\n")(1).split("\n")
+      val table: Table = new Table(i-1)
+      for (line: String <- lines) {
+        val values: Array[Long] = line.split(" ").map(v => v.toLong)
+        table.addRange(Range(values(1), values(0), values(2), i))
+      }
+      forwardingTables(i-1) = table
+    }
+
+    source.close()
+  }
+
+  /**
+   * Reorganizes all the tables by sorting the ranges and filling the gaps between them
+   */
+  def sortTables(): Unit = {
+    for (table: Table <- forwardingTables) {
+      table.sortRanges()
+      table.fillGaps()
+    }
+  }
+
+  /**
+   * Collapses all forwarding tables into a single one, mapping seeds to locations
+   */
+  def collapseTables(): Unit = {
+    for (i: Int <- forwardingTables.length - 1 until 0 by -1) {
+      val newTable: Table = collapseTable(forwardingTables(i-1), forwardingTables(i))
+      forwardingTables(i-1) = newTable
+    }
+  }
+
+  /**
+   * Collapses a forwarding table with the next tables
+   * @param table1 The table to collapse
+   * @param table2 The next table
+   * @return A new table equivalent to the fusion of both tables
+   */
+  def collapseTable(table1: Table, table2: Table): Table = {
+    // Find all new range limits
+    val limitsSet: mutable.Set[Long] = new mutable.HashSet()
+    limitsSet.addOne(table1.ranges(0).startSrc)
+    for (range: Range <- table1.ranges) {
+      limitsSet.addOne(range.endSrc)
+    }
+    limitsSet.addOne(table1.backward(table2.ranges(0).startSrc)._1)
+    for (range: Range <- table2.ranges) {
+      limitsSet.addOne(table1.backward(range.endSrc)._1)
+    }
+
+    val newTable: Table = new Table(table1.id)
+    val limits: Array[Long] = limitsSet.toArray.sorted
+
+    // For each limit, create the corresponding range by forwarding table 1 through table 2
+    for (i: Int <- 0 until limits.length - 1) {
+      val src1: Long = limits(i)
+      val dst1: (Long, Int) = table1.forward(src1)
+      if (dst1._2 != table2.id) throw new Exception("Something weird happened")
+      val dst2: (Long, Int) = table2.forward(dst1._1)
+      newTable.addRange(Range(src1, dst2._1, limits(i+1)-src1, dst2._2))
+    }
+    return newTable
+  }
+
+  def solve(path: String): Long = {
+    println("Solving puzzle 2")
+    loadInput(path)
+    println("Loaded input")
+    sortTables()
+    /*for (table: Table <- forwardingTables) {
+      println(table)
+    }*/
+    println("Sorted forwarding tables")
+    collapseTables()
+    println("Simplified forwarding tables")
+    val table: Table = forwardingTables(0)
+    //println(table)
+
+    var smallest: Long = -1
+    for (i: Int <- seeds.indices by 2) {
+      val seedStart: Long = seeds(i)
+      val seedEnd: Long = seedStart + seeds(i+1) - 1
+
+      // Find range limits lying inside seed range
+      val limitsSet: mutable.Set[Long] = new mutable.HashSet()
+      limitsSet.addOne(seedStart)
+      limitsSet.addOne(seedEnd)
+      for (r2: Range <- table.ranges) {
+        if (r2.startSrc > seedStart && r2.startSrc < seedEnd) limitsSet.add(r2.startSrc)
+        if (r2.endSrc > seedStart && r2.endSrc < seedEnd) limitsSet.add(r2.startSrc)
+      }
+      val limits: Array[Long] = limitsSet.toArray.sorted
+
+      // For each limit, forward its value and compare with current smallest
+      for (i: Int <- 0 until limits.length - 1) {
+        val value: Long = table.forward(limits(i))._1
+        if (smallest == -1 || value < smallest) smallest = value
+      }
+    }
+    return smallest
+  }
+  def main(args: Array[String]): Unit = {
+    val solution: Long = solve("res/day5/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day6/Puzzle1.scala
+++ b/src/day6/Puzzle1.scala
@@ -0,0 +1,54 @@
+package day6
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  case class Race(duration: Int, record: Int)
+
+  var races: Array[Race] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    val durations: Array[Int] = lines(0).split(": +")(1).split(" +").map(d => d.toInt)
+    val records: Array[Int] = lines(1).split(": +")(1).split(" +").map(r => r.toInt)
+
+    races = new Array(durations.length)
+
+    for (i: Int <- races.indices) {
+      races(i) = Race(durations(i), records(i))
+    }
+
+    source.close()
+  }
+
+  def getMargin(race: Race): Int = {
+    // dist = (dur - press) * press
+    // dist-record > 0 <=> f(press) = dur*press - press^2 - record > 0
+    // x^2 - d*x + r = 0
+    // x = ( d +- sqrt(d^2 - 4r) ) / 2
+
+    val delta: Double = race.duration*race.duration - 4*race.record
+    val x0: Double = (race.duration - Math.sqrt(delta))/2
+    val x1: Double = (race.duration + Math.sqrt(delta))/2
+
+    val margin: Int = (Math.ceil(x1) - Math.floor(x0) - 1).toInt
+    return margin
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 1
+    for (race: Race <- races) {
+      solution *= getMargin(race)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day6/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day6/Puzzle2.scala
+++ b/src/day6/Puzzle2.scala
@@ -0,0 +1,47 @@
+package day6
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  case class Race(duration: Long, record: Long)
+
+  var race: Race = Race(0, 0)
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    val duration: Long = lines(0).split(": +")(1).replace(" ", "").toLong
+    val record: Long = lines(1).split(": +")(1).replace(" ", "").toLong
+
+    race = Race(duration, record)
+
+    source.close()
+  }
+
+  def getMargin(race: Race): Int = {
+    // dist = (dur - press) * press
+    // dist-record > 0 <=> f(press) = dur*press - press^2 - record > 0
+    // x^2 - d*x + r = 0
+    // x = ( d +- sqrt(d^2 - 4r) ) / 2
+
+    val delta: Double = race.duration*race.duration - 4*race.record
+    val x0: Double = (race.duration - Math.sqrt(delta))/2
+    val x1: Double = (race.duration + Math.sqrt(delta))/2
+
+    val margin: Int = (Math.ceil(x1) - Math.floor(x0) - 1).toInt
+
+    return margin
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    return getMargin(race)
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day6/input1.txt")
+    println(solution)
+  }
+}
+
--- a/src/day7/Hand.scala
+++ b/src/day7/Hand.scala
@@ -0,0 +1,47 @@
+package day7
+
+import scala.collection.mutable
+
+class Hand(var cards: Array[Int], val bid: Int) {
+  def getType(): Int = {
+    val cardsMap: mutable.Map[Int, Int] = new mutable.HashMap()
+    for (card: Int <- cards) {
+      if (!cardsMap.contains(card)) {
+        cardsMap(card) = 0
+      }
+      cardsMap(card) += 1
+    }
+
+    val keys: Array[Int] = cardsMap.keys.toArray
+    val values: Array[Int] = cardsMap.values.toArray
+    if (keys.length == 1) {
+      return 6
+    }
+    if (keys.length == 2) {
+      if (values.contains(4)) return 5
+      if (values.contains(3) && values.contains(2)) return 4
+    }
+    if (values.contains(3)) return 3
+    if (values.contains(2)) {
+      if (values.count(v => v == 2) == 2) return 2
+      return 1
+    }
+    return 0
+  }
+
+  def isBetter(hand: Hand): Boolean = {
+    val t1: Int = getType()
+    val t2: Int = hand.getType()
+    if (t1 > t2) return true
+    if (t1 < t2) return false
+
+    for ((c1: Int, c2: Int) <- cards.zip(hand.cards)) {
+      if (c1 != c2) {
+        return c1 > c2
+      }
+    }
+    return false
+  }
+
+  override def toString: String = s"Hand(${cards.mkString}, $bid, ${getType()})"
+}
--- a/src/day7/Hand2.scala
+++ b/src/day7/Hand2.scala
@@ -0,0 +1,65 @@
+package day7
+
+import scala.collection.mutable
+
+class Hand2(var cards: Array[Int], val bid: Int) {
+
+  def getType(): Int = {
+    val cardsMap: mutable.Map[Int, Int] = new mutable.HashMap()
+    val jokers: Int = cards.count(c => c == 0)
+    for (card: Int <- cards) {
+      if (card != 0) {
+        if (!cardsMap.contains(card)) {
+          cardsMap(card) = 0
+        }
+        cardsMap(card) += 1
+      }
+    }
+
+    val keys: Array[Int] = cardsMap.keys.toArray
+    val values: Array[Int] = cardsMap.values.toArray
+
+    if (jokers == 5) return 6
+
+    // Five of a kind
+    for (value: Int <- values) {
+      if (value + jokers == 5) return 6
+    }
+
+    // Four of a kind
+    for (value: Int <- values) {
+      if (value + jokers == 4) return 5
+    }
+
+    // Full house
+    val sortedValues: Array[Int] = values.sorted(Ordering.Int.reverse)
+    if (sortedValues(0) + sortedValues(1) + jokers >= 5) return 4
+
+    // Three of a kind
+    if (sortedValues(0) + jokers >= 3) return 3
+
+    // Two pairs
+    if (sortedValues(0) + sortedValues(1) + jokers >= 4) return 2
+
+    // One pair
+    if (sortedValues(0) + jokers >= 2) return 1
+
+    return 0
+  }
+
+  def isBetter(hand: Hand2): Boolean = {
+    val t1: Int = getType()
+    val t2: Int = hand.getType()
+    if (t1 > t2) return true
+    if (t1 < t2) return false
+
+    for ((c1: Int, c2: Int) <- cards.zip(hand.cards)) {
+      if (c1 != c2) {
+        return c1 > c2
+      }
+    }
+    return false
+  }
+
+  override def toString: String = s"Hand(${cards.mkString}, $bid, ${getType()})"
+}
--- a/src/day7/Puzzle1.scala
+++ b/src/day7/Puzzle1.scala
@@ -0,0 +1,46 @@
+package day7
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  val CARDS: Array[Int] = Array('2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K', 'A')
+  var hands: Array[Hand] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    hands = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      val parts: Array[String] = line.split(" ")
+      val cards: Array[Int] = parts(0).map(c => CARDS.indexOf(c)).toArray
+      val bid: Int = parts(1).toInt
+      hands(i) = new Hand(cards, bid)
+    }
+
+    source.close()
+  }
+
+  def sortHands(): Unit = {
+    hands = hands.sortWith((h1: Hand, h2: Hand) => h2.isBetter(h1))
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+    sortHands()
+
+    var solution: Int = 0
+
+    for ((hand: Hand, i: Int) <- hands.zipWithIndex) {
+      solution += hand.bid * (i+1)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day7/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day7/Puzzle2.scala
+++ b/src/day7/Puzzle2.scala
@@ -0,0 +1,46 @@
+package day7
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  val CARDS: Array[Int] = Array('J', '2', '3', '4', '5', '6', '7', '8', '9', 'T', 'Q', 'K', 'A')
+  var hands: Array[Hand2] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    hands = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      val parts: Array[String] = line.split(" ")
+      val cards: Array[Int] = parts(0).map(c => CARDS.indexOf(c)).toArray
+      val bid: Int = parts(1).toInt
+      hands(i) = new Hand2(cards, bid)
+    }
+
+    source.close()
+  }
+
+  def sortHands(): Unit = {
+    hands = hands.sortWith((h1: Hand2, h2: Hand2) => h2.isBetter(h1))
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+    sortHands()
+
+    var solution: Int = 0
+
+    for ((hand: Hand2, i: Int) <- hands.zipWithIndex) {
+      solution += hand.bid * (i+1)
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day7/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day8/Ghost.scala
+++ b/src/day8/Ghost.scala
@@ -0,0 +1,80 @@
+package day8
+
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+
+class Ghost(val startId: String) extends Iterator[Long] {
+  var preLoopOffsets: ArrayBuffer[Int] = new ArrayBuffer()
+  var loopOffsets: ArrayBuffer[Int] = new ArrayBuffer()
+  var visited: ArrayBuffer[(String, Int)] = new ArrayBuffer()
+  private var distIterator: Iterator[Long] = Iterator.empty
+
+  def computePath(nodes: mutable.Map[String, Node], rule: Array[Int]): Unit = {
+    var id: String = startId
+    preLoopOffsets.addOne(0)
+    var ruleI: Int = 0
+
+    // While not looped
+    while (!visited.contains((id, ruleI))) {
+      //println(s"  Visited $id (ruleI = $ruleI)")
+      visited.addOne((id, ruleI))
+      id = nodes(id).nextNodes(rule(ruleI))
+      preLoopOffsets(preLoopOffsets.length-1) += 1
+      ruleI = (ruleI + 1) % rule.length
+      if (id.last == 'Z') {
+        preLoopOffsets.addOne(0)
+      }
+    }
+
+    val loopStartDist: Int = visited.indexOf((id, ruleI))
+    var dist: Int = 0
+    var loopStartI: Int = 0
+    while (dist < loopStartDist) {
+      dist += preLoopOffsets(loopStartI)
+      loopStartI += 1
+    }
+    loopStartI -= 1
+    preLoopOffsets(preLoopOffsets.length-1) += preLoopOffsets(loopStartI) - loopStartDist
+    println(s"  Loop from ($id, $ruleI) (index=$loopStartI)")
+    println(s"  # of offsets: ${preLoopOffsets.length}")
+
+    loopOffsets.addAll(preLoopOffsets.drop(loopStartI+1))
+    preLoopOffsets = preLoopOffsets.dropRight(preLoopOffsets.length - loopStartI - 1)
+    println(preLoopOffsets.length)
+    println(loopOffsets.length)
+    distIterator = new GhostIterator(preLoopOffsets.toArray, loopOffsets.toArray)
+  }
+
+  override def hasNext: Boolean = true
+
+  override def next(): Long = distIterator.next()
+
+  private class GhostIterator(val preLoopOffsets: Array[Int], val loopOffsets: Array[Int]) extends Iterator[Long] {
+    private var inLoop: Boolean = false
+    private var offsetI: Int = 0
+    private var dist: Long = 0
+    override def hasNext: Boolean = true
+
+    override def next(): Long = {
+      var offset: Int = 0
+      if (inLoop) {
+        offset = loopOffsets(offsetI)
+      } else {
+        offset = preLoopOffsets(offsetI)
+      }
+      dist += offset
+
+      offsetI += 1
+      if (!inLoop) {
+        if (offsetI == preLoopOffsets.length) {
+          offsetI = 0
+          inLoop = true
+        }
+      } else {
+        offsetI %= loopOffsets.length
+      }
+
+      return dist
+    }
+  }
+}
--- a/src/day8/Node.scala
+++ b/src/day8/Node.scala
@@ -0,0 +1,5 @@
+package day8
+
+class Node(val id: String, val nextNodes: Array[String]) {
+
+}
--- a/src/day8/Puzzle1.scala
+++ b/src/day8/Puzzle1.scala
@@ -0,0 +1,47 @@
+package day8
+
+import scala.collection.mutable
+import scala.io.{BufferedSource, Source}
+import scala.util.matching.Regex
+import scala.util.matching.Regex.Match
+
+object Puzzle1 {
+  var rule: Array[Int] = Array.empty
+  val nodes: mutable.Map[String, Node] = new mutable.HashMap()
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: String = source.getLines().mkString("\n")
+    val parts: Array[String] = lines.split("\n\n")
+
+    rule = parts(0).map(c => "LR".indexOf(c)).toArray
+    val regexp: Regex = new Regex("([A-Z]{3}) = \\(([A-Z]{3}), ([A-Z]{3})\\)")
+    for (line: String <- parts(1).split("\n")) {
+      val matches: Match = regexp.findFirstMatchIn(line).get
+      val id: String = matches.group(1)
+      val left: String = matches.group(2)
+      val right: String = matches.group(3)
+      nodes(id) = new Node(id, Array(left, right))
+    }
+
+    source.close()
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+    var id: String = "AAA"
+
+    while (id != "ZZZ") {
+      id = nodes(id).nextNodes(rule(solution % rule.length))
+      solution += 1
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day8/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day8/Puzzle2.scala
+++ b/src/day8/Puzzle2.scala
@@ -0,0 +1,56 @@
+package day8
+
+import scala.collection.mutable
+import scala.io.{BufferedSource, Source}
+import scala.util.matching.Regex
+import scala.util.matching.Regex.Match
+
+object Puzzle2 {
+  var rule: Array[Int] = Array.empty
+  val nodes: mutable.Map[String, Node] = new mutable.HashMap()
+  var ghosts: Array[Ghost] = Array.empty
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: String = source.getLines().mkString("\n")
+    val parts: Array[String] = lines.split("\n\n")
+
+    rule = parts(0).map(c => "LR".indexOf(c)).toArray
+    val regexp: Regex = new Regex("([A-Z]{3}) = \\(([A-Z]{3}), ([A-Z]{3})\\)")
+    for (line: String <- parts(1).split("\n")) {
+      val matches: Match = regexp.findFirstMatchIn(line).get
+      val id: String = matches.group(1)
+      val left: String = matches.group(2)
+      val right: String = matches.group(3)
+      nodes(id) = new Node(id, Array(left, right))
+    }
+
+    source.close()
+  }
+
+  def solve(path: String): Long = {
+    loadInput(path)
+
+    ghosts = nodes.keys.filter(k => k.last == 'A').map(k => new Ghost(k)).toArray
+
+    val ghostDists: mutable.Map[Ghost, Long] = new mutable.HashMap()
+    for (ghost: Ghost <- ghosts) {
+      println(s"Ghost from ${ghost.startId}")
+      ghost.computePath(nodes, rule)
+      ghostDists(ghost) = ghost.next()
+    }
+
+    while (ghostDists.values.toArray.distinct.length != 1) {
+      val minimum: (Ghost, Long) = ghostDists.toArray.minBy(_._2)
+      ghostDists(minimum._1) = minimum._1.next()
+    }
+
+    val dists: Array[Long] = ghostDists.values.toArray
+
+    return dists(0)
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Long = solve("./res/day8/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day9/Puzzle1.scala
+++ b/src/day9/Puzzle1.scala
@@ -0,0 +1,38 @@
+package day9
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  var series: Array[Series] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    series = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      series(i) = new Series(line.split(" ").map(_.toInt))
+    }
+
+    source.close()
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+
+    for (s: Series <- series) {
+      s.computeDiffs()
+      solution += s.extrapolate()
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day9/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day9/Puzzle2.scala
+++ b/src/day9/Puzzle2.scala
@@ -0,0 +1,38 @@
+package day9
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle2 {
+  var series: Array[Series] = Array.empty
+
+  def loadInput(path: String): Unit = {
+    val source: BufferedSource = Source.fromFile(path)
+    val lines: Array[String] = source.getLines().toArray
+
+    series = new Array(lines.length)
+
+    for ((line: String, i: Int) <- lines.zipWithIndex) {
+      series(i) = new Series(line.split(" ").map(_.toInt))
+    }
+
+    source.close()
+  }
+
+  def solve(path: String): Int = {
+    loadInput(path)
+
+    var solution: Int = 0
+
+    for (s: Series <- series) {
+      s.computeDiffs()
+      solution += s.reverseExtrapolate()
+    }
+
+    return solution
+  }
+
+  def main(args: Array[String]): Unit = {
+    val solution: Int = solve("./res/day9/input1.txt")
+    println(solution)
+  }
+}
--- a/src/day9/Series.scala
+++ b/src/day9/Series.scala
@@ -0,0 +1,39 @@
+package day9
+
+import scala.collection.mutable.ArrayBuffer
+
+class Series {
+  private val values: ArrayBuffer[Array[Int]] = new ArrayBuffer()
+  def this(initialValues: Array[Int]) = {
+    this()
+    values.addOne(initialValues.concat(Array(0)))
+  }
+
+  def computeDiffs(): Unit = {
+    while (!(values.last.dropRight(1).distinct.length == 1 && values.last(0) == 0)) {
+      val diffs: Array[Int] = new Array(values.last.length-1)
+      for (i: Int <- 0 until diffs.length-1) {
+        diffs(i) = values.last(i+1) - values.last(i)
+      }
+      values.addOne(diffs)
+    }
+  }
+
+  def extrapolate(): Int = {
+    val len: Int = values(0).length
+    values.last(values.last.length-1) = 0
+    for (i: Int <- values.length-2 to 0 by -1) {
+      values(i)(len-i-1) = values(i)(len-i-2) + values(i+1)(len-i-2)
+    }
+    return values(0).last
+  }
+
+  def reverseExtrapolate(): Int = {
+    val len: Int = values(0).length
+    values.last(values.last.length-1) = 0
+    for (i: Int <- values.length-2 to 0 by -1) {
+      values(i)(len-i-1) = values(i)(0) - values(i+1)(len-i-2)
+    }
+    return values(0).last
+  }
+}
--- a/src/util/Ansi.scala
+++ b/src/util/Ansi.scala
@@ -0,0 +1,19 @@
+package util
+
+object Ansi {
+  val ESC: String = "\u001b["
+  val CLEAR: String = code("0")
+  val BOLD: String = code("1")
+  val FAINT: String = code("2")
+  val ITALIC: String = code("3")
+  val UNDERLINE: String = code("4")
+  val SLOW_BLINK: String = code("5")
+  val RAPID_BLINK: String = code("6")
+  val REVERSE: String = code("7")
+  val CONCEAL: String = code("8")
+  val STRIKETHROUGH: String = code("9")
+  def FG_RGB(r: Int, g: Int, b: Int): String = code(s"38;2;$r;$g;${b}")
+  def BG_RGB(r: Int, g: Int, b: Int): String = code(s"48;2;$r;$g;${b}")
+
+  private def code(str: String): String = ESC+str+"m"
+}
--- a/tests/day10/Puzzle1Test.scala
+++ b/tests/day10/Puzzle1Test.scala
@@ -0,0 +1,12 @@
+package day10
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve 1") {
+    assert(Puzzle1.solve("tests_res/day10/input1.txt") == 4)
+  }
+  test("Puzzle1.solve 2") {
+    assert(Puzzle1.solve("tests_res/day10/input2.txt") == 8)
+  }
+}
--- a/tests/day10/Puzzle2Test.scala
+++ b/tests/day10/Puzzle2Test.scala
@@ -0,0 +1,24 @@
+package day10
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve 1") {
+    assert(Puzzle2.solve("tests_res/day10/input1.txt") == 1)
+  }
+  test("Puzzle2.solve 2") {
+    assert(Puzzle2.solve("tests_res/day10/input2.txt") == 1)
+  }
+  test("Puzzle2.solve 3") {
+    assert(Puzzle2.solve("tests_res/day10/input3.txt") == 4)
+  }
+  test("Puzzle2.solve 4") {
+    assert(Puzzle2.solve("tests_res/day10/input4.txt") == 4)
+  }
+  test("Puzzle2.solve 5") {
+    assert(Puzzle2.solve("tests_res/day10/input5.txt") == 8)
+  }
+  test("Puzzle2.solve 6") {
+    assert(Puzzle2.solve("tests_res/day10/input6.txt") == 10)
+  }
+}
--- a/tests/day11/Puzzle1Test.scala
+++ b/tests/day11/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day11
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day11/input1.txt") == 374)
+  }
+}
--- a/tests/day11/Puzzle2Test.scala
+++ b/tests/day11/Puzzle2Test.scala
@@ -0,0 +1,12 @@
+package day11
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve 1") {
+    assert(Puzzle2.solve("tests_res/day11/input1.txt", 10) == 1030)
+  }
+  test("Puzzle2.solve 2") {
+    assert(Puzzle2.solve("tests_res/day11/input1.txt", 100) == 8410)
+  }
+}
--- a/tests/day13/Puzzle1Test.scala
+++ b/tests/day13/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day13
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day13/input1.txt") == 405)
+  }
+}
--- a/tests/day13/Puzzle2Test.scala
+++ b/tests/day13/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day13
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day13/input1.txt") == 400)
+  }
+}
--- a/tests/day14/Puzzle1Test.scala
+++ b/tests/day14/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day14
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day14/input1.txt") == 136)
+  }
+}
--- a/tests/day14/Puzzle2Test.scala
+++ b/tests/day14/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day14
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day14/input1.txt", 1000000000) == 64)
+  }
+}
--- a/tests/day15/Puzzle1Test.scala
+++ b/tests/day15/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day15
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day15/input1.txt") == 1320)
+  }
+}
--- a/tests/day15/Puzzle2Test.scala
+++ b/tests/day15/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day15
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day15/input1.txt") == 145)
+  }
+}
--- a/tests/day16/Puzzle1Test.scala
+++ b/tests/day16/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day16
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day16/input1.txt") == 46)
+  }
+}
--- a/tests/day16/Puzzle2Test.scala
+++ b/tests/day16/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day16
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day16/input1.txt") == 51)
+  }
+}
--- a/tests/day18/Puzzle1Test.scala
+++ b/tests/day18/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day18
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day18/input1.txt") == 62)
+  }
+}
--- a/tests/day4/Puzzle1Test.scala
+++ b/tests/day4/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day4
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day4/input1.txt") == 13)
+  }
+}
--- a/tests/day4/Puzzle2Test.scala
+++ b/tests/day4/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day4
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day4/input1.txt") == 30)
+  }
+}
--- a/tests/day5/Puzzle1Test.scala
+++ b/tests/day5/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day5
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day5/input1.txt") == 35)
+  }
+}
--- a/tests/day5/Puzzle2Test.scala
+++ b/tests/day5/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day5
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day5/input1.txt") == 46)
+  }
+}
--- a/tests/day6/Puzzle1Test.scala
+++ b/tests/day6/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day6
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day6/input1.txt") == 288)
+  }
+}
--- a/tests/day6/Puzzle2Test.scala
+++ b/tests/day6/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day6
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day6/input1.txt") == 71503)
+  }
+}
--- a/tests/day7/Puzzle1Test.scala
+++ b/tests/day7/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day7
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day7/input1.txt") == 6440)
+  }
+}
--- a/tests/day7/Puzzle2Test.scala
+++ b/tests/day7/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day7
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day7/input1.txt") == 5905)
+  }
+}
--- a/tests/day8/Puzzle1Test.scala
+++ b/tests/day8/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day8
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day8/input1.txt") == 6)
+  }
+}
--- a/tests/day8/Puzzle2Test.scala
+++ b/tests/day8/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day8
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day8/input1.txt") == 6)
+  }
+}
--- a/tests/day9/Puzzle1Test.scala
+++ b/tests/day9/Puzzle1Test.scala
@@ -0,0 +1,9 @@
+package day9
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Test extends AnyFunSuite {
+  test("Puzzle1.solve") {
+    assert(Puzzle1.solve("tests_res/day9/input1.txt") == 114)
+  }
+}
--- a/tests/day9/Puzzle2Test.scala
+++ b/tests/day9/Puzzle2Test.scala
@@ -0,0 +1,9 @@
+package day9
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle2Test extends AnyFunSuite {
+  test("Puzzle2.solve") {
+    assert(Puzzle2.solve("tests_res/day9/input1.txt") == 2)
+  }
+}
--- a/tests_res/day10/input1.txt
+++ b/tests_res/day10/input1.txt
@@ -0,0 +1,5 @@
+.....
+.S-7.
+.|.|.
+.L-J.
+.....
--- a/tests_res/day10/input2.txt
+++ b/tests_res/day10/input2.txt
@@ -0,0 +1,5 @@
+..F7.
+.FJ|.
+SJ.L7
+|F--J
+LJ...
--- a/tests_res/day10/input3.txt
+++ b/tests_res/day10/input3.txt
@@ -0,0 +1,9 @@
+...........
+.S-------7.
+.|F-----7|.
+.||.....||.
+.||.....||.
+.|L-7.F-J|.
+.|..|.|..|.
+.L--J.L--J.
+...........
--- a/tests_res/day10/input4.txt
+++ b/tests_res/day10/input4.txt
@@ -0,0 +1,9 @@
+..........
+.S------7.
+.|F----7|.
+.||....||.
+.||....||.
+.|L-7F-J|.
+.|..||..|.
+.L--JL--J.
+..........
--- a/tests_res/day10/input5.txt
+++ b/tests_res/day10/input5.txt
@@ -0,0 +1,10 @@
+.F----7F7F7F7F-7....
+.|F--7||||||||FJ....
+.||.FJ||||||||L7....
+FJL7L7LJLJ||LJ.L-7..
+L--J.L7...LJS7F-7L7.
+....F-J..F7FJ|L7L7L7
+....L7.F7||L7|.L7L7|
+.....|FJLJ|FJ|F7|.LJ
+....FJL-7.||.||||...
+....L---J.LJ.LJLJ...
--- a/tests_res/day10/input6.txt
+++ b/tests_res/day10/input6.txt
@@ -0,0 +1,10 @@
+FF7FSF7F7F7F7F7F---7
+L|LJ||||||||||||F--J
+FL-7LJLJ||||||LJL-77
+F--JF--7||LJLJ7F7FJ-
+L---JF-JLJ.||-FJLJJ7
+|F|F-JF---7F7-L7L|7|
+|FFJF7L7F-JF7|JL---7
+7-L-JL7||F7|L7F-7F7|
+L.L7LFJ|||||FJL7||LJ
+L7JLJL-JLJLJL--JLJ.L
--- a/tests_res/day11/input1.txt
+++ b/tests_res/day11/input1.txt
@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....
--- a/tests_res/day13/input1.txt
+++ b/tests_res/day13/input1.txt
@@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
--- a/tests_res/day14/input1.txt
+++ b/tests_res/day14/input1.txt
@@ -0,0 +1,10 @@
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....
--- a/tests_res/day15/input1.txt
+++ b/tests_res/day15/input1.txt
@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7
--- a/tests_res/day16/input1.txt
+++ b/tests_res/day16/input1.txt
@@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....
--- a/tests_res/day18/input1.txt
+++ b/tests_res/day18/input1.txt
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
--- a/tests_res/day4/input1.txt
+++ b/tests_res/day4/input1.txt
@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
--- a/tests_res/day5/input1.txt
+++ b/tests_res/day5/input1.txt
@@ -0,0 +1,33 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4
--- a/tests_res/day6/input1.txt
+++ b/tests_res/day6/input1.txt
@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200
--- a/tests_res/day7/input1.txt
+++ b/tests_res/day7/input1.txt
@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483
--- a/tests_res/day8/input1.txt
+++ b/tests_res/day8/input1.txt
@@ -0,0 +1,5 @@
+LLR
+
+AAA = (BBB, BBB)
+BBB = (AAA, ZZZ)
+ZZZ = (ZZZ, ZZZ)
--- a/tests_res/day9/input1.txt
+++ b/tests_res/day9/input1.txt
@@ -0,0 +1,3 @@
+0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45
Author	SHA1	Message	Date
LordBaryhobal	2c429c5bbb	day 18 puzzle 1	2023-12-18 22:09:14 +01:00
LordBaryhobal	56b7f06e77	day 16 puzzle 2	2023-12-16 21:48:32 +01:00
LordBaryhobal	abeeee237c	day 16 puzzle 1	2023-12-16 18:18:19 +01:00
LordBaryhobal	78b3d77a29	updated README	2023-12-15 09:42:27 +01:00
LordBaryhobal	e6ef68d818	day 15 puzzle 2	2023-12-15 09:42:11 +01:00
LordBaryhobal	802404ac1f	day 15 puzzle 1	2023-12-15 08:52:58 +01:00
LordBaryhobal	67c609e489	day 14 puzzle 2	2023-12-14 16:45:07 +01:00
LordBaryhobal	d36d403402	day 14 puzzle 1	2023-12-14 07:37:10 +01:00
LordBaryhobal	6b134b55c5	day 13 puzzle 2	2023-12-13 08:08:31 +01:00
LordBaryhobal	0fb66d1bc7	day 13 puzzle 1	2023-12-13 07:50:11 +01:00
LordBaryhobal	c693cd9259	day 11 puzzle 2	2023-12-11 07:45:01 +01:00
LordBaryhobal	470eeacbf2	day 11 puzzle 1	2023-12-11 07:39:19 +01:00
LordBaryhobal	a234ea59b3	added Ansi class	2023-12-10 19:22:58 +01:00
LordBaryhobal	dedcd1cc70	added display function	2023-12-10 19:22:32 +01:00
LordBaryhobal	651418bea3	changed zone filling with flooding	2023-12-10 18:51:01 +01:00
LordBaryhobal	8d55a3c7b3	day 10 puzzle 2	2023-12-10 18:46:09 +01:00
LordBaryhobal	ee3a02060b	day 10 puzzle 1	2023-12-10 12:25:21 +01:00
LordBaryhobal	0f8f8c3f19	day 9 puzzle 2	2023-12-09 11:59:01 +01:00
LordBaryhobal	c3c9a8a4e4	day 9 puzzle 1	2023-12-09 11:53:51 +01:00
LordBaryhobal	76427545d6	day 8 puzzle 2 (naive and not optimized)	2023-12-09 11:26:07 +01:00
LordBaryhobal	3f2f2fd741	day 8 puzzle 1	2023-12-08 23:58:03 +01:00
LordBaryhobal	a170fb9b50	day 7 puzzle 2	2023-12-07 11:16:53 +01:00
LordBaryhobal	6493ca83f0	day 7 puzzle 1	2023-12-07 10:23:18 +01:00
LordBaryhobal	86ca2c95af	day 6 puzzle 2	2023-12-06 08:31:14 +01:00
LordBaryhobal	c8ea1636e1	day 6 puzzle 1	2023-12-06 08:12:54 +01:00
LordBaryhobal	4e1cd00e53	improved (a lot) day 5 puzzle 2	2023-12-05 22:29:29 +01:00
LordBaryhobal	123d0db8b2	updated progress in README	2023-12-05 22:07:46 +01:00
LordBaryhobal	43f355cdd8	day 5 puzzle 2 (bad)	2023-12-05 22:01:52 +01:00
LordBaryhobal	6d95994276	day 5 puzzle 1	2023-12-05 09:43:00 +01:00
LordBaryhobal	9f27d02b93	day 4 puzzle 2	2023-12-04 07:44:35 +01:00
LordBaryhobal	6a9dfc8ef1	day 4 puzzle 1	2023-12-04 07:30:50 +01:00
				`@@ -0,0 +1 @@`
				`rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7`