import lyng.time

val n = 700_000

fun tm<T>(block: ()->T): T {
    val t = Instant()
    block().also {
        println("tm: ${Instant() - t}")
    }
}

val x = tm { List.fill(n) { it * 10 + 1 } }
val y = tm { List.fill(n, n + 10) { it * 10 + 1 } }
tm { x.add(-1) }
tm { y.add(-2) }