aoc-2022-10

2022-day10.scala

import scala.io.Source

def run(xs: List[Int], x: Int = 1, cycle: Int, checkList: List[Int], res: List[Int] = List()): List[Int] =
  checkList match
    case Nil => res
    case h :: t if h == cycle => run(xs, x, cycle, t, x * h :: res)
    case _ =>
      xs match
        case Nil => res
        case h :: t => run(t, x + h, cycle + 1, checkList, res)
 
def change(xs: List[String], res: List[Int] = List()): List[Int] =
  xs match
    case Nil => res
    case h :: t =>
      if h == "noop" then change(t, 0 :: res)
      else change(t, h.split(" ")(1).toInt :: 0 :: res)

def ans1(xs: List[String]): Int =
  val checkCycle = List(20, 60, 100, 140, 180, 220)
  val t = run(xs = change(xs).reverse, cycle = 1, checkList = checkCycle)
  t.sum

def run2(xs: List[Int], x: Int = 1, cycle: Int = 0, res: String = ""): String =
  val next = if cycle >= x - 1 && cycle < x + 2 then "#" else "."
  xs match
    case Nil => res
    case h :: t => run2(t, x + h, (cycle + 1) % 40, res + next)

def screen(xs: String): List[String] =
  if xs.length > 40 then
    val (h, t) = xs.splitAt(40)
    h :: screen(t)
  else
    xs :: List() 

def ans2(xs: List[String]): String =
  val s = run2(xs = change(xs).reverse)
  screen(s).mkString("\n")

def solve =
  val input = Source.fromFile("day10.txt").getLines.toList
  println(ans1(input))
  println(ans2(input))

def test =
  val input = Source.fromFile("ex10.txt").getLines.toList
  
  val ans = """##..##..##..##..##..##..##..##..##..##..
###...###...###...###...###...###...###.
####....####....####....####....####....
#####.....#####.....#####.....#####.....
######......######......######......####
#######.......#######.......#######....."""
  println(ans2(input))
  println()
  println(ans)