Hackerrank `The Birthday Bar` problem

TheBirthdayBar.scala

// https://www.hackerrank.com/challenges/the-birthday-bar/problem

import scala.io._
import scala.annotation.tailrec

object Solution {

    // Complete the birthday function below.
    def birthday(s: Array[Int], d: Int, m: Int): Int = {

      @tailrec
      def loop(xs: List[Int], acc: Int = 0): Int = xs match {
        case h::t if xs.length >= m => {
          if (xs.take(m).sum == d) loop(t, acc + 1) 
          else loop(t, acc)
        }
        case _ => acc
      }

      loop(s.toList)
    }

    def main(args: Array[String]): Unit = {
        val n = StdIn.readLine.trim.toInt

        val s = StdIn.readLine.replaceAll("\\s+$", "").split(" ").map(_.trim.toInt)
        val dm = StdIn.readLine.replaceAll("\\s+$", "").split(" ")

        val d = dm(0).toInt

        val m = dm(1).toInt

        val result = birthday(s, d, m)

        println(result)
    }
}