Roof Length - KOTLIN

import java.util.*

var sc: Scanner = Scanner(System.`in`)

fun main() {
    val n: Int = sc.nextInt()
    val k: Int = sc.nextInt()
    val arr = IntArray(n)
    for (i in 0 until n)
        arr[i] = sc.nextInt()
    val res = roofLength(n, k, arr)
    println(res)
}

fun roofLength(n: Int, k: Int, cars: IntArray): Int {
    Arrays.sort(cars)
    var res = cars[k - 1] - cars[0] + 1
    for (i in 1 until n - k + 1) {
        res = Math.min(res, cars[k - 1 + i] - cars[i] + 1)
    }
    return res
}