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2019/Scala/day01/Day1.scala

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+package day01
+
+import kamlib.{Reader, Wrapper}
+
+class Day1 {
+
+  /** Find fuel needed */
+  def solveP1(input: List[Int]): Int =
+    input.foldLeft (0) {(acc, i) => acc + (i/3-2)}
+
+  /** Find fuel needed and recursive fuel */
+  def solveP2(input: List[Int]): Int =
+  {
+    @scala.annotation.tailrec
+    def findRecursiveFuel(fuel: Int, acc: Int): Int =
+    {
+      if (fuel <= 0) acc
+      else findRecursiveFuel((fuel/3)-2, fuel+acc)
+    }
+    input.foldLeft (0) { (acc, i) => acc + findRecursiveFuel((i/3)-2, 0)}
+  }
+
+}

2019/Scala/day01/Main.scala

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+package day01
+
+import kamlib.{Reader, Wrapper}
+
+object Main {
+
+  /** MAIN */
+  def main(args: Array[String]): Unit =
+  {
+    val input: List[Int] = Reader.readList("/input1.txt").map(_.toInt)
+    val solution: Day1 = new Day1
+
+    println("Part 1")
+    Wrapper(solution.solveP1(input)).print()
+    println("Part 2")
+    Wrapper(solution.solveP2(input)).print()
+  }
+
+}

2019/Scala/day01/worksheet1.sc

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+import scala.io.Source
+val lines = Source.fromFile(getClass.getResource("/input1.txt").getFile).getLines().toList
+
+// 1
+val result1 = lines.foldLeft (0) { (acc, i) => acc + (i.toInt/3-2)}
+println(result1)
+
+// 2
+@scala.annotation.tailrec
+def findRecursiveFuel(fuel:Int, acc:Int):Int =
+{
+  val nextFuel = (fuel/3)-2
+  if (nextFuel <= 0) acc
+  else findRecursiveFuel(nextFuel, nextFuel+acc)
+}
+
+val result2 = lines.foldLeft (0) { (acc, i) => acc + findRecursiveFuel(i.toInt, 0)}
+println(result2)