Maths Assignment - KOTLIN

// Author : Saurav Kalsoor
// Maths Assignment - KOTLIN

import java.util.*


var sc: Scanner = Scanner(System.`in`)
var list: ArrayList<Long> = ArrayList<Long>()

fun main() {
    val n: Long = sc.nextLong()
    val result = mathsAssignment(n)
    println(result)
}

fun init() {
    val b = BitSet(36)
    for (i in 0..35) {
        b.set(i)
        for (j in i + 1..35) {
            b.set(j)
            val longArray: LongArray = b.toLongArray()
            list.add(longArray[0])
            b.clear(j)
        }
        b.clear(i)
    }
    Collections.sort(list)
}

fun lessThan(n: Long): Long {
    var low = 0
    var high: Int = list.size - 1
    var index = 0
    while (low <= high) {
        val mid = low + (high - low) / 2
        if (list.get(mid) <= n) {
            index = mid
            low = mid + 1
        } else {
            high = mid - 1
        }
    }
    return list.get(index)
}

fun greaterThan(n: Long): Long {
    var low = 0
    var high: Int = list.size - 1
    var index = high
    while (low <= high) {
        val mid = low + (high - low) / 2
        if (list.get(mid) >= n) {
            index = mid
            high = mid - 1
        } else {
            low = mid + 1
        }
    }
    return list.get(index)
}

fun mathsAssignment(n: Long): Long {
    init()
    val a = lessThan(n)
    val b = greaterThan(n)
    return Math.min(Math.abs(n - a), Math.abs(n - b))

}