add day 12 code

Co-authored-by: Jamie Thompson <[email protected]>
Co-authored-by: Decel <[email protected]>

Author: bishabosha

2022/input/day12

@@ -0,0 +1,41 @@
+abcccccaaaccccaacaaccaaaaaaaaaaaaaaaaaaaaccccccccccccccccccccccccccccccccccaaaaaa
+abcccccaaaacccaaaaaccaaaaaaaaaaaaaaaaaaaaacccccccccccccccccccccccccccccccccccaaaa
+abcccccaaaaccaaaaaccccaaaccaaaaaacccacaaaaccccccccccccccccaaaccccccccccccccccaaaa
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+abccccccaacccccaacccccccccaaaaaaaaccccccccccccccccccccccccaaaaccaaacccccccccccccc
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+abcccaaaaaaaaccccacccccccaaaccccaaacccaaaaaccccccccccaaaaaaajjjjkkkccccccaacccccc
+abcccaaaaaaaacaaaacccccccccccccccccccaaaaaccccccccciiiijjjjjjjjjkkkkcaaaaaacccccc
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+abaaaacccccccccccccccccccccaaaaccccccccaaaccccciiqqqqqttrrrruuuuussskkaaaaacccccc
+abaaaacccccccccccccccccccccaaaaaccccccccaaaaccchiqqqtttttuuuuuuuussskkcccaacccccc
+abaaacccccaaaccacccccccccccaacaaccccccaaaaaaccchhqqqtttttuuuuxxuussslllcccccccccc
+abaaaaccccaaaaaacaaccccccaccccccccccccaaaaacccchhqqqttxxxxuuxxyyusssllllccccccccc
+abacaaccccaaaaaacaaaaaaaaaaccccccccccccaaaaaccchhqqqttxxxxxxxxyuusssslllccccccccc
+abcccccccaaaaaaacaaaaaaaaaccccaacccccccaaccaccchhhqqtttxxxxxxyyvvvsssslllcccccccc
+abcccccccaaaaaaaaaaaaaaaaaccccaaaaccccccccccccchhhppqttxxxxxyyyvvvvsqqqlllccccccc
+SbcccaaccaaaaaaaaaaaaaaaaaacaaaaaacccccccccccchhhhpptttxxxEzzyyyyvvvqqqqlllcccccc
+abcccaaccccaaacaaaaaaaaaaaaacaaaaccccccccccccchhhppptttxxxyyyyyyyyvvvqqqlllcccccc
+abaaaaaaaacaaacaaaaaaaaaaaaacaaaaacaaccccccccchhpppsssxxyyyyyyyyvvvvvqqqlllcccccc
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+abccaaaaccccaacaacaaacaaacccccccccaaacaaaccaagggppssswwwwwwyyywvvqqqqqqmmmccccccc
+abcaaaaaccccaaaaacaaccaaccaaaccaaaaaaaaaaaaaagggppsssswwwswwyywvrqqqqmmmmcccccccc
+abcaaaaaaccaaaaacccccccccaaaaccaaaaaaaaaacaaagggpppssssssswwwwwwrrqmmmmmccccccccc
+abcaacaaaccaaaaaaccccccccaaaaccccaaaaaacccaaagggppppssssssrwwwwrrrmmmmmdccccccccc
+abccccaaaccaaaaaaccccccccaaaaccccaaaaaacccaacggggpooooooosrrwwwrrnmmmddddcacccccc
+abccccaaaaaaaacccccccccccccccccccaaaaaaaccccccggggoooooooorrrrrrrnnmdddddaaaacccc
+abcccccaaaaaaccccccccccccccccccccaaacaaacccccccggggfffooooorrrrrrnnddddaaaaaacccc
+abccaaaaaaaacccccccccccccccccccccaccccccccccccccggffffffooonrrrrnnndddaaaaaaacccc
+abccaaaaaaaaaccccaacccccccccccccccccccccccccccccccfffffffoonnnnnnndddcaaaaacccccc
+abccaaaaaaaaaacccaaccccccccccccccaccccccccccccccccccccffffnnnnnnnedddaaaaaacccccc
+abcccccaaaaaaaaaaaacccccccaccccaaacccccccccccccccccccccfffeennnneeedcccccaacccccc
+abcccccaaacccaaaaaaaaccccaaacccaaaccacccccccccccccccccccafeeeeeeeeecccccccccccccc
+abcccccaaccccaaaaaaaaacccaaaaaaaaaaaaccccccaaaccccccccccaaeeeeeeeeeccccccccccccca
+abaccccccccccaaaaaaaaacccaaaaaaaaaaacccccccaaaaacccccccaaaaceeeeecccccccccccaccca
+abaccccccccccaaaaaaaaccaaaaaaaaaaaaaacccccaaaaaccccccccaaaccccaaacccccccccccaaaaa
+abaccccccccccaaaaaaacccaaaaaaaaaaaaaacccccaaaaacccccccccccccccccccccccccccccaaaaa
+abaccccccccccaccaaaacccaaaaaaaaaaaaaaccccccaaaaaccccccccccccccccccccccccccccaaaaa

2022/src/day12.scala

@@ -0,0 +1,69 @@
+package day12
+
+import locations.Directory.currentDir
+import inputs.Input.loadFileSync
+
+@main def part1: Unit =
+  println(s"The solution is ${part1(loadInput())}")
+
+@main def part2: Unit =
+  println(s"The solution is ${part2(loadInput())}")
+
+def loadInput(): String = loadFileSync(s"$currentDir/../input/day12")
+
+def part1(data: String): Int =
+  solution(IndexedSeq.from(data.linesIterator), 'S')
+
+def part2(data: String): Int =
+  solution(IndexedSeq.from(data.linesIterator), 'a')
+
+case class Point(x: Int, y: Int):
+  def move(dx: Int, dy: Int):
+    Point = Point(x + dx, y + dy)
+  override def toString: String =
+    s"($x, $y)"
+end Point
+
+val up    = (0, 1)
+val down  = (0, -1)
+val left  = (-1, 0)
+val right = (1, 0)
+val possibleMoves = List(up, down, left, right)
+
+def path(point: Point, net: Map[Point, Char]): Seq[Point] =
+  possibleMoves.map(point.move).filter(net.contains)
+
+def matching(point: Point, net: Map[Point, Char]): Char =
+  net(point) match
+    case 'S' => 'a'
+    case 'E' => 'z'
+    case other => other
+
+def solution(source: IndexedSeq[String], srchChar: Char): Int =
+  // create a sequence of Point objects and their corresponding character in source
+  val points =
+    for
+      y <- source.indices
+      x <- source.head.indices
+    yield
+      Point(x, y) -> source(y)(x)
+  val p = points.toMap
+  val initial = p.map(_.swap)('E')
+  val queue = collection.mutable.Queue(initial)
+  val length = collection.mutable.Map(initial -> 0)
+  //bfs
+  while queue.nonEmpty do
+    val visited = queue.dequeue()
+    if p(visited) == srchChar then
+      return length(visited)
+    for visited1 <- path(visited, p) do
+      val shouldAdd =
+        !length.contains(visited1)
+        && matching(visited, p) - matching(visited1, p) <= 1
+      if shouldAdd then
+        queue.enqueue(visited1)
+        length(visited1) = length(visited) + 1
+    end for
+  end while
+  throw IllegalStateException("unexpected end of search area")
+end solution