Minimise Expenses - KOTLIN

package com.company

import java.util.*


fun main() {
    val sc = Scanner(System.`in`)
    val n = sc.nextInt()
    val expenses = Array(n) { IntArray(2) }
    for (i in 0 until n) {
        expenses[i][0] = sc.nextInt()
        expenses[i][1] = sc.nextInt()
    }
    val result = minimiseExpenses(expenses, n)
    println(result)
}


fun minimiseExpenses(expenses: Array<IntArray>, n: Int): Int {
    val list = ArrayList<Pair<Int, Int>>()
    for (i in 0 until n) {
        list.add(i, Pair(expenses[i][0] - expenses[i][1], i))
    }
    list.sortWith(Comparator { (first), (first1) -> first - first1 })

    var totalExpense = 0
    for (i in 0 until n / 2)
        totalExpense += expenses[list[i].second][0]

    for (i in n / 2 until n)
        totalExpense += expenses[list[i].second][1]
    return totalExpense
}