Find Pair - KOTLIN

package com.company

import java.util.*


fun main() {
    val sc = Scanner(System.`in`)
    val n = sc.nextInt()
    val x = sc.nextInt()
    val list = ArrayList<Int>()
    for (i in 0 until n) {
        val num = sc.nextInt()
        list.add(num)
    }
    println(findPair(list, x, n))
}

fun findPair(list: ArrayList<Int>, x: Int, n: Int): Int {
    list.sort()
    var i = 0
    var j = n - 1
    while (i < j) {
        if (list[i] + list[j] == x)
            return Math.abs(list[i] - list[j])
        else if (list[i] + list[j] < x)
            i++
        else j--
    }
    return -1
}