Day 12, at least it works

aoc/src/dev/ctsk/aoc/Grid.scala

@@ -61,3 +61,9 @@ class Grid[A](val data: Array[Array[A]]):
 
   def contains(p: Point): Boolean =
     p.x >= 0 && p.y >= 0 && p.x < height && p.y < width
+
+  def points: Seq[Point] =
+    for
+      x <- data.indices
+      y <- data(x).indices
+    yield Point(x, y)

aoc/src/dev/ctsk/aoc/Main.scala

@@ -13,7 +13,8 @@ val solvers = Map[Int, Solver](
   8 -> Day08,
   9 -> Day09,
   10 -> Day10,
-  11 -> Day11
+  11 -> Day11,
+  12 -> Day12
 )
 
 def runSolver(solver: Solver, input: os.Path): Unit =

aoc/src/dev/ctsk/aoc/days/Day12.scala

@@ -0,0 +1,74 @@
+package dev.ctsk.aoc.days
+
+import dev.ctsk.aoc.*
+import dev.ctsk.aoc.Direction.*
+import collection.mutable
+
+import scala.collection.mutable.ArrayBuffer
+
+object Day12 extends Solver(12):
+  case class Plots(
+      layout: Grid[Int],
+      edges: Map[Int, Array[(Point, Direction)]],
+      sizes: Map[Int, Int]
+  )
+
+  def mapPlots(grid: Grid[Char]): Plots =
+    val layout = Grid(Array.fill(grid.height, grid.width)(-1))
+    val edges = mutable.Map.empty[Int, Array[(Point, Direction)]]
+    val sizes = mutable.Map.empty[Int, Int]
+
+    def fill(start: Point, label: Int): Unit =
+      layout(start) = label
+      val edge = ArrayBuffer.empty[(Point, Direction)]
+      val plant = grid(start).get
+      var size = 1
+
+      def rec(current: Point): Unit =
+        for
+          dir <- Seq(Up, Down, Left, Right)
+          next = dir(current)
+        do
+          grid(next) match
+            case Some(p) if p == plant =>
+              if layout(next).contains(-1) then {
+                layout(next) = label
+                size += 1
+                rec(next)
+              }
+            case Some(_) => edge += ((current, dir))
+            case None    => edge += ((current, dir))
+
+      rec(start)
+      edges(label) = edge.toArray
+      sizes(label) = size
+
+    for
+      p <- grid.points
+      if layout(p).contains(-1)
+    do fill(p, sizes.size)
+//    grid.points.zipWithIndex.foreach(fill)
+    Plots(layout, edges.toMap, sizes.toMap)
+
+  def part1(plots: Plots): Int =
+    plots.sizes.map((k, v) => v * plots.edges(k).length).sum
+
+  def part2(plots: Plots): Int =
+    plots.sizes
+      .map((id, size) =>
+        val edge = plots.edges(id).toSet
+        val corners = edge -- edge.map((pt, dir) => (dir.turnRight(pt), dir))
+        size * corners.size
+      )
+      .sum
+
+  override def run(input: os.ReadablePath): (Timings, Solution) =
+    val grid = Grid(os.read.lines(input).map(_.toArray).toArray)
+    val (pre_time, plots) = timed { mapPlots(grid) }
+    val (p1_time, p1_solution) = timed { part1(plots) }
+    val (p2_time, p2_solution) = timed { part2(plots) }
+
+    (
+      Timings(pre_time, p1_time, p2_time),
+      Solution(Int.box(p1_solution), Int.box(p2_solution))
+    )

data/12.ans

@@ -0,0 +1,2 @@
+1374934
+841078

data/12.in

@@ -0,0 +1,140 @@
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+YYYYYYYYYYZZYYYYYYYGGPPPPPPPPPPVGGGKKKKKKYYYYYYYYYYYFFFFFFFFFFFSSSSSSOOOJJNJJJYYYJJJJJJJJIICCCCCCCCCCPKKKKKKKKKKKKKKKKNNNNNWNNNNNNNUUSSSSSSS
+YYYYYYYYYYZZYYFYYGGGGGGGPEEPEVVVVVVXKKKKKKYYYYYYYYYYFFFFFFFFFFFSSSSSSOOOONNJJJJYYJJJJJJJIIICCCCCCCCKKKKKKKKKKKKKKKKKKKKNNNWWNNNNNWNUUSSSSSSS
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+FFFFFWWWWWWIWWWGWGGGGGGGGEEEEEEEEEEEEEEEBBBBBBBBRRRFRRRRYSYYSSSSSSYYYYYYTNNNHNNNNNNNBBBBQQQQMMMSSSSSSSSJJIIIIIIIIIIIIIIBBBBBBBBBPPPPPZZZZISS
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+JJKKKDDDDDIVVVVVVVDDDDDDDDDDFFFUUUUEUUUUULLLLLLPLLDDDAAAAAIAAAAKMRRRRRRRRRAAAAANNNNNNNNXXXXXXXXXXXXXEEEEEEEEEFGGGGFFFFFFFFFFWZZZZZZZZZZZVVZZ
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+KKKKKKKKDDDVRUSVVVDDDDDDDDDDFFFFFEEEEUUUUULLNNNNQQDDDPAAAAAAAAXMMRRRRRRRRRAAAAANNNNNNNXXXXXXXXXXXXXXNEEEEEEFFFGGGGNNNNNNNRRRRRZZZZZZZZZZZZZZ
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+YKKKKKKKDDDDUUUVVDDDDDDDDDDDDAFFFEEEEUNNNNNNNNNNNNRDPPAAAAAAAAHHMMMMMMMMMMMMAAAAAAMNNNNNXXXXXXNXNNJJJEEEEEEFFFGGGGNNNNNNNNNNNZZZZZZZZZZZZZZZ
+KKKKKKKDDDUUUUUUUUUDDQDDDMDDDAAAEEEEEUNFFNFFNNNNRRRRFPPAAAAAAHHHHHMMMMMMMMMMMMAAAAMNNNNXXXNNNNNXNNNJJJJPPJUJFFGGGGGGNNNNNNNNNZZZZZZZZZZZZZZZ
+KKKKKKKKKDDDDUUUUUUUQQDDDDDDDAAAAEEEEUFFFFFFNNNNFFFRFAAAAAAAAAHHHMMMMMMMMMMMMMMMMAMMNNNNNNNNNNNNNNNNJJJJJJUGGGGGGGGGNNNNNNNNNZZZZZZZZZEZZZZZ
+KKKKKKKKKDDDDUUUUUUUUUUDADDAAAAAEEEEENBFFFFFFFFFFFFFFAAAAAAAAHHHHHHMMMMMMZZMMMMMMMMNNNNNNNHHHHNNNNJNNJJJJUUGGGGNNGGGNNNNNNNSNNVVZZZZZEEEZZZZ
+KKKKKKKKKDUUUUUUUUUUUUUUAAAAAAAAEEEEEEBFFFFFFFFFFFFFFFAAAAAAAAHHHHHMMMMMMMZZZMMMMMMJHHHHHHHHHHNNNNJJNJJJJJUGGGGLLLLLLNNNNNNNNVVZZZZZEEEEEZZZ
+KKKKKKKKKKKUUUUUUUUUUUUUAAAAAAABBEEEEBBBFFFFFFFFFFFFFFAAAAAAAAHHHHHHHHMMMMMMMMMMMMJJHHHHHHHHHHNNNJJJUJJJJJJGGGGLLLLLLNNNNNNNNVVVVZZZEEEEEEZZ
+KKKKKKKKKKKUUUUUUUUUUUUUAAAAAAABBBBBBBBBBFFFFFFFFFFEFAALAAAAAAHHHHHHHHMMMMMMMMMMMMMJHHHHHHHHHBBNNJJJJJJJJJJGGGGLLLLLLNNNNNNNVVVVVVZZZEEEEEEE
+KKKEEEKKKKKUUEUUUUUUUUUHHHAAAAABBBBKBBBBBBBFFFFFFFFFFVALAKAAAHHHHHHHHHHHCCCMMMMMMMMJHHHHHHHHHBBNNJVJJJJJJJJGGGGLLLLLLVNVVVVVVVVVVZZZEEEEEEEE
+KEEEEEKEEEEUUEEUUUUUUUUHHHHAAAABBBBBBBBBBBBFFFFFFFFFFVVXXKXHHHHHCHCCHHHHHHCMMMMMMMMJHHHHHHHHHBBNNFVJJJJJJJJGGGGLLLLLLVVVVVVVVVVVZZEEEEEEEEEE
+KEEEEEEEEEEEEEEEUUUUUUHHHHHHAABBBBBBBBBBBBBFFFFFFFFFFFFXXXXXHHHHCCCCCHHHHCCCMMMMMMMMHHHHHHHHHBBNFFFFJJJJJJJLLLLLLLLLLVVVVVVVVVVVVZEEEEEEEEEE
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+KKEEEEEEEEEEEBBBBBIZIIIIIIIIIAAABBBBBBQBBBBHHHHHHHOOFXXXXXXXXXCCCCCCCCCCCCQQQQQCCCMMCCCCCCCCCCCUUUUUUUUUUUJLLLLLPLLLLLLLLLLLLNNNNNEEEEEEIIEI
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+DDDDDDEEEEEEUWWUUUUUUUUUUUUUUKKKKOOOOORRRRRRRRRRKKKKKWWWWWWWWWEFFFBFBBFZZZZZZZZVVVSFFFFFFXFFFFYYYYYYYYYYYGGGGGGGGGGGGLLLLLLLLLLEEEEEEEEVVVVV
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+DEEEEEEDDDDDIWWFFFWWWWUUUUUUUUKKOOOOOPPRRZZZZZZZZZZZZZZZZWWWWWBBFBBBBBBBZZZZZZCCCSSFSSSFFOXXXXXXXXXYYYYYYYGGGGGGGGGGPLLLLLHLLLLEEEEEEEEVVVVV
+DEEEEEEEDDDDWEWWWWWWWWKUUUUUWWWKOOOOOOPPRZZZZZZZZZZZZZZZZWWWTWBBBBBBBBBBZZSSZZZCSSSSSSSFFOXXXXXXXXXXYYYYYYYYYGGGGGTTTTLLLLLLLLLLEOEEEEVVVVVV
+DEEEEEEEDDDWWWWWWWWWWWKKUIWWWWKKOOPOPPPPXZZZZZZZZZZZZZZZZKWWWWBBBBBBBBBBZZZSSSSSSSSSSSSSXOXXXXXXXXXXYYYYYYYYYGGYTTTTTTTTLLLLLLLLLLEEEEVVVVVV
+EEEEEEEEEDTWWWWWWWWWWIIIIIIWWWWWPPPPPPXXXZZZZZZZZZZZZZZZZKKWBBBBBBBBBBBBZZZSWSWSSSSWWSSSXXXXXXXXXXXXXYYYYYYYYYYYTTTTTTTTTTOLLLLLLLEVVVVVVVVV
+IEEEEEEEVWWWWWWWWWWPWIIIIIIWIIPPPPPPPPPXXZZZZZZZZZZZZZZZZZKKBBBBBBBBBBBBBBBBWSWSSWWWWWWXXXXXXXXXXXXXXYYYYYYYYYYTTTTTTTTTTTTLLLLLLVVVVVVVVVVV
+IEEEEEEEEEELWWWPWWPPWIIIIIIIIIPPPPPPPXXXXZZZZZZZZZZZZZZZZZPPBTBBBBBBBBBBBBMMWWWWWWWWWWWWXXXXXXXXXZYYYYYYYWYYYYYTTXTTTTTKKTTLLLLLLVVVVVVVVVVV
+IIIIIEEEEEEEPWWPPPPPPAIIIIIIIIPPPPPPPXXXXZZZZZZZZZZZZZZZZZPPPBBXNBBBBBBBBBMMWMWWWWWWWQQQXXXXXXXXXZZYYYYYYWWYYYYTTTTTTTTTTTTTLLLLVVVVVZZZZZZV
+IIIIEEEEEECCCNWPPAPPAAIIIIIIIPPPGPGPGGXXXXXZZZZZZZZZZZZZZZPPPPBXXVBBBBBBBMMMMMMWWWWWWWWXXXXXXXXXXZYYYYYYWWWYWWYTTWTWWWWWWTTTLPPLLVVVZZZZZZZV
+IIIIEEEEECCCCNNAAAPAAAIIIIIIIPPPGGGGGGXXXXXHHHWWZZZZZZZZZZPPPXXXXXXZXBBMMMMQQMMWWWWWWWWHXXXXXHXHHYYYEYYYWWWYWWWWWWWWWWWKKKKLLPVVVVVVVZZZZZZZ
+IVVVVGGEECCCNNNAAAPAAAAAIIIIIPPGGGGGGGGGXXXHWWWWZZZZZZZZZZPPPXXXXXXXXAAAMMMQQQMWWWWWWWWHHHXXHHXHEEEEEYEYWWWWWWWWWWCWWWWKKKKWHVVVOOVVVZQZZZZZ
+IVVVVGGEJJJJANAAAAAAAAAAYIPPPPPPGGGGGGGKXXXHWWWWWWWKPKPPPPPPXXXXXXXXXAAAMMMQQQQWWWWWWWWHHHHHHHHHHEEEEEEWWWWWFWWWWCCCCCCKKKKWHVVOOOOOVOQQZZZZ
+VVVVVVVJJJJAAAAAAAAAAAAAAPPPRPPPGPGGGGGKKHHHHWWWWWWWPPPPPPXXXXXXXXXXAAAAAMQQXQQVVVWWWWHHHHHHHHHHHEEEEEEWEWWFFWWWWICCCCCKKKKHHNNOOOOOOOQZZZZZ
+VVVVVVJJJJJJAAAAAAAAAAAAAAPPRRRPPPGGGGGKKKKHWWWWWWWWPPPPPPPPPXXXXXXXAAARAARQQRVVVVWWHHHHHHHHHHHEEEEEEEEEEFFFFFWWCCCCCCCKKKKHHHOOOOOOOOZZZZZZ
+VVVVVVJJJLJJAAAAAAAAAAAAAAAPPRRGGGGGGGGKKKKKFWWWWWWPPPPPPOOPXXXXXXXAAARRRRRQRRVVVVWWHHHOOOOOOOEEEEEEEEEEEFFFFFWWCCCCCCHKKKKHHHHHOJOOOOOOZZZZ
+VVVVVVJJJLLJJAAAAAAAAAAAWTPPRRRRRRGTGKKKKKKKFWWWWWWPPPPPPOOOOOXPPPCCAAARRRRRRRVVVVLSHHSCCOOOOOEEEEEEEEEEFFFFFFFCCCCCCCHKKKKKKKHOOOOOOOOOZZZO
+VVVVVVJJJLMJJUAAAAAAAAAAWTPRRRRRRRRRKKKKKKKKKWWWWWPPPPPPPOOOOOPPPCCCAAARRRRRRVVVVVVSSSSOOOOOOOOOEEEEEEEEAAAFFFFCCCCCCCHKKKKKKKHVVOOOOOOOOZOO
+VVVVVVJJJLMMUUUUAAAAAAAAATTRRRRRRRRKKKKKHKKOKWWWWWPPPPPPPPOOOOWWJOOOORRRRRRRRGVRVSSSSSSOOOOOOOJEEEEEEEEJJAAAFFFCCCCHHHHKKKKKKKGGVOOOOOOOOZOO
+VVAVVMMMMMMMHUUUUUAAAAATATTTRRRRRRRRKKKKKKKRRRWWWIIPPPPPPOOAOOWWWOOOORRRRRRRRRRRSSVSSSSOEOOOOOOEEEEEEEJJJAAFFFFCFCCHHHHHGKKKKKGGOOOOOOOOOOOO
+VVAVVMMMMMMMMUUUUUUAAAATTTTTTRRRRRTTKKKKKRRRRTTTTUIPPPPPPPMOOWWWWAOOOOXXRXRRRRRSSSSSSSSOOOOOOOUUUEEEEEJJJAAAFFFFFIIHHHHHHKKKKKGOOOOOOOOOOOOO
+VVXXXMMMMMMMMUUUUUUUUTTTTTTTRRRRRRRRRRNKGRRRRXTUUUPPPPPPPUWWWWWWWWOOOXXXXXXXERRRSSSSSSSSSSOOOOOOEEHEEEJKKKKKKKKKKIHHHHHHHKKKKKGGGOOOOOOOOOOO
+XXXXXMMMMMMMMUUUUUUUTTTTTTTTTBBRRRQRRQKKGXRRRXTUUUUUPPPUUUWWWWWWWWOWOXXXXXXOERERSSSSSSSSSHOHHHHHHHHEEJJKKKKKKKKKKKKKKKKKKKKKKKLGGGGOOOOOOOOO
+XXXXXMMMMMMMMMOUUUTTTTTTTTBBBBBQQQQQRRGXGXXXXXXXXXUUPPPPUUTWWWWWWWWWXXXXXXXXEEEESSSSSSSHSHHHHHHHHHHHJJJKKKKKKKKKKKKKKKKKKKLSSLGGGGGGOOOOOOOO
+XEEXEEEEEMMMMMOUWUTTTTTTTTTZBBZQZZZQQQXXXXXXXXXXXXUUUUUUUUUWWWWWWWWWXXXXXXXEEEEESSSSSSSHHHHHHHHHHHHHJJIKKKKKKKKKKKKKKKKKKKLLLLGGGGGWOOOOOOOO
+EEEEEEEEEEKKMMOKKKJJTTTTTTTZZZZZZZZXXXXXXXXXXXXXXXUUUUUUUUUWWWWWWWWWXXXXXXXXEEEEEESSSSSHHHHHHHHHHHHHHJIKKKKKKKKKKIIIQQLLLLLLLLGGVVVOOVVVGGOO
+EEEEEEEEEEKKKKKKKKRJJTTTTTTZZZZQQZZZXKXXXDXXXXXXUUUUUEUUUNNNNWWWWWWWXXXWXXEEEEEEEESSSSSKQQQKKHHHHHHHHIIJIIIIIIIIIIIQQQLLLLLLLLLLVVVVOVVVVGGG
+EEEEEEEEEEEKKKKKKJJJJJTTTTTZZZZZZZZZZZXXXDDDXXDXUUUUUENEENNNNNWWWWWWXXXWEEEEEEEEESSSSSSKKKKKKHHHHFKNNIIIIIIIIIIIIQQQQQLLLLLLLLLVVVVVVVVGGGGG
+EEEEEEEEEEEEKKKJJJJJJJTTTTTTZZZZZZZZZXXDDDDDXDDXUUBUUEEEEENNNWWWWGWWWWWWOEEEEEEEEESSSSKKKKKKKKKKKKKNKKKIIIIIIIIIIIQQQQLLLLLLLLLVVVVVVVGGGGGG
+EEEMMEEEEEEEKKKJJJJJJJJTTTTBZZZZZZWZZZDDDDDDDDDDUUBBEEEEEENNNWWWIWWWWWWWWETTEEEEEESSSSSKKKKKKKKKKKKKKKKKIIIIIIIIIIQQQLLLLLLLVAAVVVVVVJJJJJJG
+EEMMMMMEEKKKKKKKJJJJJJJJTTTTZZZZZZWZGZDDDDDDDDDDDDBBEEEEEENNWWWWWWWWWWWWWETTEEEEEHSSSKKKKKKKKKKKKKKKKKKKIIIIIIIIIQQQQQQLLLVVVVVVVVVVVVAJJJJJ
+EEMMMMMEEKKKKKKKJJJJJJJZZZZZZZZZZWWGGZDDDDDDDDDDDDBBBEEBBBNNBIIWWWWWWWWWWTTTEXEEEETSSSBBBBKKKKKKKKKKKKKIIIILLLIIQQQQQQQQLVVVVVVVVVVVVVAAJJJP
+AAMMMMMKEKKKKKKJJJJJJJJZZZZZZZZZZWWWGDDDDDDDDDDDDDBBBBBBBBBBBIWWWWWWWWWJWTTTTEEETTTBBBBBBBKKKKKKKKKKKKKIBBLLLIIIIQQQQQQQQQVVVVVVVVVVVVAAJJJP
+AAAMMMMKKKKKKJKJJJJJJJJZZZZZZZZZZWWWWDDDDDDDDDDDDDDBBBBBBBBBBIWWWWWWWWWWWTTTTEETTTTTBBBBBBBBKKKKKKKKKKKBBBBLLLLLQQQQQQQQQVVVVVVVVVVVVVVAJJJJ
+AAAAAAMKKKKKJJKJJJJJJJJJZZZZZZZZZWWDDDDDDDDDDDDDDDBBBBBBBBBBBBJNWWWWWWWWWPTTTTTTTUTBBBBBBBBBBKKKKKKKKKKKBBBLLLLLQQQQQQTQQQQVVVVVVVVVVVAAAAJI
+AATTTATKKKKKKJJJJJJJJJJJJJFZZZZZZWWWDDDDDDDDDDDDDBBBBBBBBBBBBNNNWWWWWWWWWPTTTTTTTUUBBBBBBBBBBKKKKKKKKKKKKBBLLLLLQQQQQQTQQQQVVVVVVVVVVRRAARRR
+AATTTTTKTKKKJLJJJJJJJJJZZZZZZZZZZZZZDDDDDDDDDDDDBBBBBBBBBBBBBNNNWWNWWWWWPPPTTTTTTUUUABBBBBBBBBKBKKPPKKKKBBFLLLLLQQQQQQTTTTTYYVVVVVVVVRRRRRRR
+TTTTTTTTTTKKJLJJJJJJJJJJJZZZWWZZZZZZDGDDDDDDDDBBBBBBBBBBBBBBBNNNNNNWWNJWEPPTPUUUUUUUUBBBBBBBBBBBBBBPKKKFBFFLLLTQQQQQTQOTTTTTYVVVVVVVVRRRRRRR
+TTTTTTTTTTTJJJJJJJJJJJJJJWWZWWZZZZIIIIODDDDDDXSXBBBBBBBBBBBBBFNNNNNNNNNQPPPPPKURRRUUUBBBBBBBBBBBBBPPZKFFFFFLFTTQQQQQTTTTTTTTTTTTVVVVVVRRRRRR
+TTTTTTTTTTTJJJJJRJJJJJJWWWWWWZZZZIIIIIDDDDDMMXXXBBBBBBBBBBNNNFNNNNNNNNNQQPPPPCRRRUUUBBBBBBBBBBBBBBBZZKFFFFFFFTQQQQTTTTTTTTTTTTTVVVVVVVVRRRRV
+ETTTTTTTVTTJJWJJJJJJJWWWWWWWWZZZPIIIIIIDDDMMMMXXXXXBBBBBBBNNNNNNNNNNNNNNQPPPCCRRRRUUBBBBBBYBBBBBBZZZZZZFFFFFFFQQQEETTTTTTTTTTTTVVVVVVVVRRVVV
+ETTTTTTTVVVVWWWJWWWJWWWWWWWWZZZZZIIIPIMMMDMMMXXXXXXXXBTBTNNNNNNNNNNNNNNNNPPPCCRCRCFFBBBBBBBBBTTTBZZZZZFFFFFFFGGQQETTTTTTTTTVTTPVVVVVVVVVVVVV
+ETTTTTTTTVWWWWWWWWWWWWWWWWWWWWZZZWWWWWMMMMMMXXXXXXXXXTTTTTNNNNNNNNNNNNNNPPPPCCCCCCCBBBBBBTBBBTTTTTTZZZZFFFFFFGGGQQGTTTTTTBVVPPPPVVVVVVVVVVVV
+EEETTTTTVVWXWWWWWWWWWWWWWWWWWZZZZWWWWMMMMMMMXXXXXXXXXXTTTTTTNNNNNNNNNNNNPPPPCCCCCCCBBBBTTTTTTTTTTTTZZZTTMTTFFGGGGGGTTBTTBBVVPVPPVVVVVVVVVVVV
+EEETTTTMWWWWWWWWWWWWWWWWWWWWWWZZWWWWMMMMMMMMMMXXXXXXTTTTTTTTNNNNNNNNNNNNNAPPCCCCCCCCCXXTTTTTTTTTTTTZTTTTTTTGGGGGGGGGGTTTBVVVVVVVVVVVVVVVVVVV
+EEETTTMMWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWMMMMMMXXXXXXXXXXXTTTTTTNNNNNNNNNNNNAPPCACXXXXXXXXTTTTTTTTTTTTTTTTTTTTGGGGGGGGGGGGTBVVVVVVVVVVVVVVVVVVV