Day1.scala

package lascala.aoc2021.day1_10.day1

def countDeeper(depths: Seq[Int]): Int =
  depths.init zip depths.tail count { case (a, b) => a < b }

def countDeeperWindoes(depths: Seq[Int]): Int =
  val windows = depths.sliding(3, 1).map(_.sum).toSeq
  countDeeper(windows)

def depths(s: String): Seq[Int] = s.split("\n").map(_.toInt)

def solve1(s: String): Int =
  countDeeper(depths(s))

def solve2(s: String): Int =
  countDeeperWindoes(depths(s))

@main def part1: Unit =
  val ans = solve1(input)
  println(ans)

@main def part2: Unit =
  val ans = solve2(input)
  println(ans)

//val input = ...

Day1Test.scala

package lascala.aoc2021.day1_10.day1

import minitest.SimpleTestSuite
import hedgehog.minitest.HedgehogSupport
import hedgehog.*

object Day1Test extends SimpleTestSuite with HedgehogSupport:
  val depths: Seq[Int] = """199
200
208
210
200
207
240
269
260
263""".split("\n").map(_.toInt).toSeq

  example("day1 - countDeeper") {
    countDeeper(depths) ==== 7
  }

  example("day1 - countDeeperWindoes") {
    countDeeperWindoes(depths) ==== 5
  }