measureTimeMillis

import kotlin.system.*

fun main(args: Array<String>) {
//sampleStart
val numbers: List<Int>
val timeInMillis = measureTimeMillis {
    numbers = buildList {
        addAll(0..100)
        shuffle()
        sortDescending()
    }
}
// here numbers are initialized and sorted
println(numbers.first()) // 100

println("(The operation took $timeInMillis ms)")
//sampleEnd
}