Advent of Code 2022-4.scala

import java.io.FileInputStream
import scala.annotation.tailrec
import scala.io.StdIn


case class Range(min: Int, max: Int):
  def fullyContains(other: Range): Boolean =
    other.min >= min && other.max <= max

  def overlaps(other: Range): Boolean =
    (min <= other.min && other.min <= max) || (other.min <= min && min <= other.max)

def solve4_1(values: Vector[(Range, Range)]): Int =
  values.count { case (range1, range2) =>
    range1.fullyContains(range2) || range2.fullyContains(range1)
  }

def solve4_2(values: Vector[(Range, Range)]): Int =
  values.count(_ overlaps _)

@main def solve4(): Unit =
  val in = new FileInputStream("example4-2.in")
  System.setIn(in)
  val inputs = Iterator.continually(StdIn.readLine())
    .takeWhile(line => null != line)
    .map(line => {
      line.split(",").map { range =>
        val Array(min: String, max: String) = range.split("-")
        Range(min.toInt, max.toInt)
      } match
        case Array(range1, range2) => (range1, range2)
    })
    .toVector
  println(solve4_1(inputs))
  println(solve4_2(inputs))