Day 11

input/day11

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src/day11.scala

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+package aoc
+package day11
+
+import Math.abs
+import util.chaining.*
+
+val dayNumber = "11"
+
+@main def part1: Unit =
+  println(part1(loadInput(dayNumber)))
+
+@main def part2: Unit =
+  println(part2(loadInput(dayNumber)))
+
+def part1(input: String): String =
+  def expandVertically(grid: Array[Array[Char]]) =
+    grid.flatMap(l => if l.contains('#') then List(l) else List(l, l))
+
+  def transpose(grid: Array[Array[Char]]): Array[Array[Char]] =
+    Array.tabulate(grid.head.length)(x =>
+      Array.tabulate(grid.length)(y => grid(y)(x))
+    )
+
+  val grid = input
+    .split('\n')
+    .map(_.toCharArray)
+    .pipe(expandVertically)
+    .pipe(transpose)
+    .pipe(expandVertically)
+    .tapEach(l => println(l.mkString))
+
+  val galaxies =
+    (for
+      x <- grid.head.indices
+      y <- grid.indices
+      if grid(y)(x) == '#'
+    yield (x, y))
+
+  galaxies
+    .combinations(2)
+    .map { case Seq((xa, ya), (xb, yb)) => abs(xb - xa) + abs(yb - ya) }
+    .sum
+    .toString
+
+def part2(input: String): String =
+  val grid = input
+    .split('\n')
+
+  val expandedRows = grid.indices.filter(y => !grid(y).contains('#'))
+  val expandedCols = grid.head.indices.filter(x => grid.forall(_(x) != '#'))
+
+  val expansionMult: Long = 1_000_000 - 1
+
+  val galaxies =
+    (for
+      x <- grid.head.indices
+      y <- grid.indices
+      if grid(y)(x) == '#'
+    yield (x, y))
+
+  galaxies
+    .combinations(2)
+    .map { case Seq((xa, ya), (xb, yb)) =>
+      val colExpansions =
+        expandedCols.count(x => xa < x && x < xb || xb < x && x < xa)
+      val rowExpansions =
+        expandedRows.count(y => ya < y && y < yb || yb < y && y < ya)
+      abs(xb - xa) + abs(yb - ya) +
+        colExpansions * expansionMult +
+        rowExpansions * expansionMult
+    }
+    .sum
+    .toString