Advent code

advent.scala

"2x2x4\n1x1x10".split("\n").map(_.split("x").map(_.toInt).sorted).map { case Array(a,b,c) => a*b*3 + (a+b)*c*2 }.sum

"2x2x4\n1x1x10".split("\n").map(_.split("x").map(_.toInt).sorted).map { case Array(a,b,c) => (a+b)*2 + a*b*c }.sum

"^>v<".
  map { 
    case '^' => (0, 1)
    case 'v' => (0, -1)
    case '<' => (1, 0)
    case '>' => (-1, 0) 
  }.
  scanLeft((0, 0)) { case ((xx, yy), (x, y)) => (x + xx, y + yy) }.
  distinct.
  length

"^>v<".
  map { 
    case '^' => (0, 1)
    case 'v' => (0, -1)
    case '<' => (1, 0)
    case '>' => (-1, 0) 
  }.
  zipWithIndex.
  scanLeft(((0,0), (0,0))) { 
    case (((xx, yy), z), ((x, y), i)) if i % 2 == 0 => ((x + xx, y + yy), z)
    case ((z, (xx, yy)), ((x, y), _)) => (z, (x + xx, y + yy))
  }.
  flatMap { case (x, y) => List(x, y) }.
  distinct.
  length