Kotlin

fun maxMin(k: Int, arr: Array): Int { var sortedArray = arr.sorted() var result: Int? = null

for(i in 0 until sortedArray.size - k - 1) {
    var diff = sortedArray[i + k - 1] - sortedArray[i]
    if(result == null) {
        result = diff
    } else {
        if(result > diff) {
            result = diff
        }
    }
}
return result ?: 0

}