Advent of Code 2021-1.scala

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

def solve1_1(inputs: Vector[Int]): Int = {
  inputs.sliding(2).count(v => v(0) < v(1))
}

def solve1_2(inputs: Vector[Int]): Int = {
  solve1_1(inputs.sliding(3).map(_.sum).toVector)
}

@main def solve1(): Unit =
  val in = new FileInputStream("example1-2.in")
  System.setIn(in)
  val inputs = Iterator.continually(StdIn.readLine())
    .takeWhile(line => null != line && line.trim.nonEmpty)
    .map(_.toInt)
    .toVector
  println(solve1_1(inputs))
  println(solve1_2(inputs))