Day 6

src/day06.scala

@@ -0,0 +1,32 @@
+package aoc
+package day06
+
+val dayNumber = "06"
+
+@main def part1: Unit =
+  println(part1(loadInput(dayNumber)))
+
+@main def part2: Unit =
+  println(part2(loadInput(dayNumber)))
+
+def part1(input: String): String =
+  val lines   = input.split('\n').map(_.trim)
+  val numbers = lines.init.map(_.split("\\s+").map(_.toLong)).transpose
+  val ops     = lines.last.split("\\s+").map[(Long, Long) => Long] {
+    case "*" => _ * _
+    case "+" => _ + _
+  }
+  numbers.zip(ops).map((numbers, op) => numbers.reduce(op)).sum.toString
+
+def part2(input: String): String =
+  val columns  = input.split('\n').map(_.toArray).transpose.map(_.mkString).mkString("\n")
+  val problems = columns.split("\n +\n")
+  problems
+    .map(p =>
+      val lines   = p.split('\n')
+      val numbers = lines.map(_.filter(_.isDigit)).filterNot(_.isBlank).map(_.toLong)
+      val op: (Long, Long) => Long = lines.head.last match
+        case '*' => _ * _
+        case '+' => _ + _
+      numbers.reduce(op)
+    ).sum.toString